Remote Network Monitoring Management Information Base

Version 2

using SMIv2

Status of this Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Abstract

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP/IP-based internets. In particular, it defines objects for managing remote network monitoring devices.

Table of Contents

1 The Network Management Framework ......................    2
2 Overview ..............................................    2
2.1 Remote Network Management Goals .....................    3
2.2 Structure of MIB ....................................    5
3 Control of Remote Network Monitoring Devices ..........    6
3.1 Resource Sharing Among  Multiple  Management  Sta-
     tions ..............................................    7
3.2 Row Addition Among Multiple Management Stations .....    9
4 Conventions ...........................................   10
5 RMON 2 Conventions ....................................   10
5.1 Usage of the term Application Level .................   10
5.2 Protocol Directory and Limited Extensibility ........   11
5.3 Errors in packets ...................................   11
6 Definitions ...........................................   12
7 Security Considerations ...............................  122
8 Appendix - TimeFilter Implementation Notes ...........   123
9 Acknowledgments ......................................   129
10 References ...........................................  129
11 Author's Address......................................  130

1. The Network Management Framework

The Internet-standard Network Management Framework consists of three components. They are:

RFC 1902 [1] which defines the SMI, the mechanisms used for describing and naming objects for the purpose of management.

RFC 1213, STD 17, [3] which defines MIB-II, the core set of managed objects for the Internet suite of protocols.

RFC 1905 [4] which defines the SNMP, the protocol used for network access to managed objects.

The Framework permits new objects to be defined for the purpose of experimentation and evaluation.

Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Within a given MIB module, objects are defined using the SMI's OBJECT-TYPE macro. At a minimum, each object has a name, a syntax, an access-level, and an implementation-status.

The name is an object identifier, an administratively assigned name, which specifies an object type. The object type together with an object instance serves to uniquely identify a specific instantiation of the object. For human convenience, we often use a textual string, termed the object descriptor, to also refer to the object type.

The syntax of an object type defines the abstract data structure corresponding to that object type. The ASN.1 [6] language is used for this purpose. However, RFC 1902 purposely restricts the ASN.1 constructs which may be used. These restrictions are explicitly made for simplicity.

The access-level of an object type defines whether it makes "protocol sense" to read and/or write the value of an instance of the object type. (This access-level is independent of any administrative authorization policy.)

The implementation-status of an object type indicates whether the object is mandatory, optional, obsolete, or deprecated.

2. Overview

This document continues the architecture created in the RMON MIB [RFC 1757] by providing a major feature upgrade, primarily by providing RMON analysis up to the application layer.

Remote network monitoring devices, often called monitors or probes, are instruments that exist for the purpose of managing a network. Often these remote probes are stand-alone devices and devote significant internal resources for the sole purpose of managing a network. An organization may employ many of these devices, one per network segment, to manage its internet. In addition, these devices may be used for a network management service provider to access a client network, often geographically remote.

The objects defined in this document are intended as an interface between an RMON agent and an RMON management application and are not intended for direct manipulation by humans. While some users may tolerate the direct display of some of these objects, few will tolerate the complexity of manually manipulating objects to accomplish row creation. These functions should be handled by the management application.

2.1. Remote Network Management Goals

o Offline Operation

There are sometimes conditions when a management
station will not be in constant contact with its remote monitoring devices. This is sometimes by
design in an attempt to lower communications costs (especially when communicating over a WAN or
dialup link), or by accident as network failures
affect the communications between the management
station and the probe.

For this reason, this MIB allows a probe to be
configured to perform diagnostics and to collect statistics continuously, even when communication with the management station may not be possible or
efficient. The probe may then attempt to notify the management station when an exceptional condition
occurs. Thus, even in circumstances where communication between management station and probe is not continuous, fault, performance, and configuration information may be continuously accumulated and communicated to the management station conveniently and efficiently.

o Proactive Monitoring

Given the resources available on the monitor, it is potentially helpful for it continuously to run diagnostics and to log network performance. The
monitor is always available at the onset of any
failure. It can notify the management station of the failure and can store historical statistical
information about the failure. This historical information can be played back by the management
station in an attempt to perform further diagnosis
into the cause of the problem.

o Problem Detection and Reporting

The monitor can be configured to recognize
conditions, most notably error conditions, and
continuously to check for them. When one of these conditions occurs, the event may be logged, and management stations may be notified in a number of
ways.

o Value Added Data

Because a remote monitoring device represents a network resource dedicated exclusively to network management functions, and because it is located
directly on the monitored portion of the network, the remote network monitoring device has the opportunity
to add significant value to the data it collects. For instance, by highlighting those hosts on the
network that generate the most traffic or errors, the probe can give the management station precisely the information it needs to solve a class of problems.

o Multiple Managers

An organization may have multiple management stations for different units of the organization, for different functions (e.g. engineering and operations), and in an attempt to provide disaster recovery. Because environments with multiple management stations are
common, the remote network monitoring device has to
deal with more than own management station,
potentially using its resources concurrently.

2.2. Structure of MIB

The objects are arranged into the following groups:

• protocol directory

• protocol distribution

• address mapping

• network layer host

• network layer matrix

• application layer host

• application layer matrix

• user history

• probe configuration

These groups are the basic units of conformance. If a remote monitoring device implements a group, then it must implement all objects in that group. For example, a managed agent that implements the network layer matrix group must implement the nlMatrixSDTable and the nlMatrixDSTable.

Implementations of this MIB must also implement the system and interfaces group of MIB-II [3]. MIB-II may also mandate the implementation of additional groups.

These groups are defined to provide a means of assigning object identifiers, and to provide a method for managed agents to know which objects they must implement.

This document also contains enhancements to tables defined in the RMON MIB [RFC 1757]. These enhancements include:

1. Adding the DroppedFrames and LastCreateTime conventions to each table defined in the RMON MIB.

2. Augmenting the RMON filter table with a mechanism that allows filtering based on an offset from the beginning of a particular protocol, even if the protocol headers are variable length.

3. Augmenting the RMON filter and capture status bits with additional bits for WAN media and generic media. These bits are defined here as:

        Bit     Definition
        6       For WAN media, this bit is set for packets
                coming from one direction and cleared for
                packets coming from the other direction.
                It is an implementation specific matter
                as to which bit is assigned to which
                direction, but it must be consistent for
                all packets received by the agent, and if
                the agent knows which end of the link is
                "local" and which end is "network", the bit
                should be set for packets from the "local"
                side and should be cleared for packets from
                the "network" side.
        
        7       For any media, this bit is set for any packet
                with a physical layer error. This bit may be
                set in addition to other media-specific bits
                that denote the same condition.
        
        8       For any media, this bit is set for any packet
                that is too short for the media. This bit may
                be set in addition to other media-specific
                bits that denote the same condition.
        9       For any media, this bit is set for any packet
                that is too long for the media. This bit may
                be set in addition to other media-specific bits
                that denote the same condition.

These enhancements are implemented by RMON-2 probes that also implement RMON and do not add any requirements to probes that are compliant to just RMON.

3. Control of Remote Network Monitoring Devices

Due to the complex nature of the available functions in these devices, the functions often need user configuration. In many cases, the function requires parameters to be set up for a data collection operation. The operation can proceed only after these parameters are fully set up.

Many functional groups in this MIB have one or more tables in which to set up control parameters, and one or more data tables in which to place the results of the operation. The control tables are typically read/write in nature, while the data tables are typically read/only.

Because the parameters in the control table often describe resulting data in the data table, many of the parameters can be modified only when the control entry is not active. Thus, the method for modifying these parameters is to de-activate the entry, perform the SNMP Set operations to modify the entry, and then re-activate the entry. Deleting the control entry causes the deletion of any associated data entries, which also gives a convenient method for reclaiming the resources used by the associated data.

Some objects in this MIB provide a mechanism to execute an action on the remote monitoring device. These objects may execute an action as a result of a change in the state of the object. For those objects in this MIB, a request to set an object to the same value as it currently holds would thus cause no action to occur.

To facilitate control by multiple managers, resources have to be shared among the managers. These resources are typically the memory and computation resources that a function requires.

3.1. Resource Sharing Among Multiple Management Stations

When multiple management stations wish to use functions that compete for a finite amount of resources on a device, a method to facilitate this sharing of resources is required. Potential conflicts include:

    o Two management stations wish to simultaneously use
      resources that together would exceed the capability of
      the device.
    o A management station uses a significant amount of
      resources for a long period of time.
    o A management station uses resources and then crashes,
      forgetting to free the resources so others may
      use them.

The OwnerString mechanism is provided for each management station initiated function in this MIB to avoid these conflicts and to help resolve them when they occur. Each function has a label identifying the initiator (owner) of the function. This label is set by the initiator to provide for the following possibilities:

    o A management station may recognize resources it owns
      and no longer needs.
    o A network operator can find the management station that
      owns the resource and negotiate for it to be freed.
    o A network operator may decide to unilaterally free
      resources another network operator has reserved.

• Upon initialization, a management station may recognize resources it had reserved in the past. With this information it may free the resources if it no longer needs them.

Management stations and probes should support any format of the owner string dictated by the local policy of the organization. It is suggested that this name contain one or more of the following: IP address, management station name, network manager's name, location, or phone number. This information will help users to share the resources more effectively.

There is often default functionality that the device or the administrator of the probe (often the network administrator) wishes to set up. The resources associated with this functionality are then owned by the device itself or by the network administrator, and are intended to be long-lived. In this case, the device or the administrator will set the relevant owner object to a string starting with 'monitor'. Indiscriminate modification of the monitor-owned configuration by network management stations is discouraged. In fact, a network management station should only modify these objects under the direction of the administrator of the probe.

Resources on a probe are scarce and are typically allocated when control rows are created by an application. Since many applications may be using a probe simultaneously, indiscriminate allocation of resources to particular applications is very likely to cause resource shortages in the probe.

When a network management station wishes to utilize a function in a monitor, it is encouraged to first scan the control table of that function to find an instance with similar parameters to share. This is especially true for those instances owned by the monitor, which can be assumed to change infrequently. If a management station decides to share an instance owned by another management station, it should understand that the management station that owns the instance may indiscriminately modify or delete it.

It should be noted that a management application should have the most trust in a monitor-owned row because it should be changed very infrequently. A row owned by the management application is less long-lived because a network administrator is more likely to re- assign resources from a row that is in use by one user than from a monitor-owned row that is potentially in use by many users. A row owned by another application would be even less long-lived because the other application may delete or modify that row completely at its discretion.

3.2. Row Addition Among Multiple Management Stations

The addition of new rows is achieved using the RowStatus method described in RFC 1903 [2]. In this MIB, rows are often added to a table in order to configure a function. This configuration usually involves parameters that control the operation of the function. The agent must check these parameters to make sure they are appropriate given restrictions defined in this MIB as well as any implementation specific restrictions such as lack of resources. The agent implementor may be confused as to when to check these parameters and when to signal to the management station that the parameters are invalid. There are two opportunities:

• When the management station sets each parameter object.

• When the management station sets the row status object to active.

If the latter is chosen, it would be unclear to the management station which of the several parameters was invalid and caused the badValue error to be emitted. Thus, wherever possible, the implementor should choose the former as it will provide more information to the management station.

A problem can arise when multiple management stations attempt to set configuration information simultaneously using SNMP. When this involves the addition of a new conceptual row in the same control table, the managers may collide, attempting to create the same entry. To guard against these collisions, each such control entry contains a status object with special semantics that help to arbitrate among the managers. If an attempt is made with the row addition mechanism to create such a status object and that object already exists, an error is returned. When more than one manager simultaneously attempts to create the same conceptual row, only the first will succeed. The others will receive an error.

In the RMON MIB [RFC 1757], the EntryStatus textual convention was introduced to provide this mutual exclusion function. Since then, this function was added to the SNMP framework as the RowStatus textual convention. The RowStatus textual convention is used for the definition of all new tables.

When a manager wishes to create a new control entry, it needs to choose an index for that row. It may choose this index in a variety of ways, hopefully minimizing the chances that the index is in use by another manager. If the index is in use, the mechanism mentioned previously will guard against collisions. Examples of schemes to choose index values include random selection or scanning the control table looking for the first unused index. Because index values may be any valid value in the range and they are chosen by the manager, the agent must allow a row to be created with any unused index value if it has the resources to create a new row.

Some tables in this MIB reference other tables within this MIB. When creating or deleting entries in these tables, it is generally allowable for dangling references to exist. There is no defined order for creating or deleting entries in these tables.

4. Conventions

The following conventions are used throughout the RMON MIB and its companion documents.

   Good Packets

Good packets are error-free packets that have a valid frame length. For example, on Ethernet, good packets are error-free packets that are between 64 octets long and 1518 octets long. They follow the form defined in IEEE 802.3 section 3.2.all.

   Bad Packets

Bad packets are packets that have proper framing and are therefore recognized as packets, but contain errors within the packet or have an invalid length. For example, on Ethernet, bad packets have a valid preamble and SFD, but have a bad CRC, or are either shorter than 64 octets or longer than 1518 octets.

5. RMON 2 Conventions

The following practices and conventions are introduced in the RMON 2 MIB.

5.1. Usage of the term Application Level

There are many cases in this MIB where the term Application Level is used to describe a class of protocols or a capability. This does not typically mean a protocol that is an OSI Layer 7 protocol. Rather, it is used to identify a class of protocols that is not limited to MAC-layer and network-layer protocols, but can also include transport, session, presentation, and application-layer protocols.

5.2. Protocol Directory and Limited Extensibility

Every RMON 2 implementation will have the capability to parse certain types of packets and identify their protocol type at multiple levels, The protocol directory presents an inventory of those protocol types the probe is capable of monitoring, and allows the addition, deletion, and configuration of protocol types in this list.

One concept deserves special attention: the "limited extensibility" of the protocol directory table. The RMON 2 model is that protocols are detected by static software that has been written at implementation time. Therefore, as a matter of configuration, an implementation does not have the ability to suddenly learn how to parse new packet types. However, an implementation may be written such that the software knows where the demultiplexing field is for a particular protocol, and can be written in such a way that the decoding of the next layer up is table-driven. This works when the code has been written to accomodate it and can be extended no more than one level higher. This extensibility is called "limited extensibility" to highlight these limitations. However, this can be a very useful tool.

For example, suppose that an implementation has C code that understands how to decode IP packets on any of several ethernet encapsulations, and also knows how to interpret the IP protocol field to recognize UDP packets and how to decode the UDP port number fields. That implementation may be table- driven so that among the many different UDP port numbers possible, it is configured to recognize 161 as SNMP, port 53 as DNS, and port 69 as TFTP. The limited extensibility of the protocol directory table would allow an SNMP operation to create an entry that would create an additional table mapping for UDP that would recognize UDP port 123 as NTP and begin counting such packets.

This limited extensibility is an option that an implementation can choose to allow or disallow for any protocol that has child protocols.

5.3. Errors in packets

Packets with link-level errors are not counted anywhere in this MIB because most variables in this MIB requires the decoding of the contents of the packet, which is meaningless if there is a link-level error.

Packets in which protocol errors are detected are counted for all protocols below the layer in which the error was encountered. The implication of this is that packets in which errors are detected at the network-layer are not counted anywhere in this MIB, while packets with errors detected at the transport layer may have network-layer statistics counted.

6. Definitions

RMON2-MIB DEFINITIONS ::= BEGIN
IMPORTS
    MODULE-IDENTITY, OBJECT-TYPE, Counter32, Integer32,
        Gauge32, IpAddress, TimeTicks            FROM SNMPv2-SMI
    TEXTUAL-CONVENTION, RowStatus, DisplayString, TimeStamp
                                                 FROM SNMPv2-TC
    MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF
    mib-2, ifIndex                  FROM RFC1213-MIB
    OwnerString, statistics, history, hosts,
    matrix, filter, etherStatsEntry, historyControlEntry,
    hostControlEntry, matrixControlEntry, filterEntry,
    channelEntry                    FROM RMON-MIB
    tokenRing, tokenRingMLStatsEntry, tokenRingPStatsEntry,
    ringStationControlEntry, sourceRoutingStatsEntry
                                    FROM TOKEN-RING-RMON-MIB;
--  Remote Network Monitoring MIB

rmon MODULE-IDENTITY

    LAST-UPDATED "9605270000Z"
    ORGANIZATION "IETF RMON MIB Working Group"
    CONTACT-INFO
        "Steve Waldbusser   (WG Editor)
         Postal: International Network Services
         650 Castro Street, Suite 260
         Mountain View, CA 94041
         Phone:  +1 415 254 4251
         Email:  waldbusser@ins.com
    
         Andy Bierman   (WG Chair)
         Phone:  +1 805 648 2028
         Email:  abierman@west.net"
    DESCRIPTION
        "The MIB module for managing remote monitoring
         device implementations. This MIB module
         augments the original RMON MIB as specified in
         RFC 1757."
    ::= { mib-2 16 }

-- { rmon 1 } through { rmon 10 } are defined in RMON and

-- the Token Ring RMON MIB [RFC 1513]

    protocolDir     OBJECT IDENTIFIER ::= { rmon 11 }
    protocolDist    OBJECT IDENTIFIER ::= { rmon 12 }
    addressMap      OBJECT IDENTIFIER ::= { rmon 13 }
    nlHost          OBJECT IDENTIFIER ::= { rmon 14 }
    nlMatrix        OBJECT IDENTIFIER ::= { rmon 15 }
    alHost          OBJECT IDENTIFIER ::= { rmon 16 }
    alMatrix        OBJECT IDENTIFIER ::= { rmon 17 }
    usrHistory      OBJECT IDENTIFIER ::= { rmon 18 }
    probeConfig     OBJECT IDENTIFIER ::= { rmon 19 }
    rmonConformance OBJECT IDENTIFIER ::= { rmon 20 }

-- Textual Conventions

ZeroBasedCounter32 ::= TEXTUAL-CONVENTION

STATUS current
DESCRIPTION

"This TC describes an object which counts events with the following semantics: objects of this type will be set to zero(0) on creation and will thereafter count appropriate events, wrapping back to zero(0) when the value 2^32 is reached.

Provided that an application discovers the new object within the minimum time to wrap it can use the initial value as a delta since it last polled the table of which this object is part. It is important for a management station to be aware of this minimum time and the actual time between polls, and to discard data if the actual time is too long or there is no defined minimum time.

        Typically this TC is used in tables where the INDEX space is
        constantly changing and/or the TimeFilter mechanism is in use."
    SYNTAX Gauge32

LastCreateTime ::= TEXTUAL-CONVENTION

STATUS current
DESCRIPTION

"This TC describes an object that stores the last time its entry was created.

        This can be used for polling applications to determine that an
        entry has been deleted and re-created between polls, causing
        an otherwise undetectable discontinuity in the data."
    SYNTAX TimeStamp

TimeFilter ::= TEXTUAL-CONVENTION

    STATUS        current
    DESCRIPTION

"To be used for the index to a table. Allows an application to download only those rows changed since a particular time. A row is considered changed if the value of any object in the row changes or if the row is created or deleted.

When sysUpTime is equal to zero, this table shall be empty.

One entry exists for each past value of sysUpTime, except that the whole table is purged should sysUpTime wrap.

As this basic row is updated new conceptual rows are created (which still share the now updated object values with all other instances). The number of instances which are created is determined by the value of sysUpTime at which the basic row was last updated. One instance will exist for each value of sysUpTime at the last update time for the row. A new timeMark instance is created for each new sysUpTime value. Each new conceptual row will be associated with the timeMark instance which was created at the value of sysUpTime with which the conceptual row is to be associated.

By definition all conceptual rows were updated at or after

time zero and so at least one conceptual row (associated with

timeMark.0) must exist for each underlying (basic) row.

See the appendix for further discussion of this variable.

Consider the following fooTable:

        fooTable ...
        INDEX { fooTimeMark, fooIndex }
        
        FooEntry {
           fooTimeMark  TimeFilter
           fooIndex     INTEGER,
           fooCounts    Counter
        }

Should there be two basic rows in this table (fooIndex == 1, fooIndex == 2) and row 1 was updated most recently at time 6, while row 2 was updated most recently at time 8, and both rows had been updated on several earlier occasions such that the current values were 5 and 9 respectively then the following fooCounts instances would exist.

        fooCounts.0.1  5
        fooCounts.0.2  9
        fooCounts.1.1  5
    
        fooCounts.1.2  9
        fooCounts.2.1  5
        fooCounts.2.2  9
        fooCounts.3.1  5
        fooCounts.3.2  9
        fooCounts.4.1  5
        fooCounts.4.2  9
        fooCounts.5.1  5
        fooCounts.5.2  9
        fooCounts.6.1  5
        fooCounts.6.2  9
        fooCounts.7.2  9    -- note that row 1 doesn't exist for
        fooCounts.8.2  9    -- times 7 and 8"
    SYNTAX    TimeTicks

DataSource ::= TEXTUAL-CONVENTION

    STATUS        current
    DESCRIPTION
        "Identifies the source of the data that the associated
        function is configured to analyze. This source can be any
        interface on this device.

In order to identify a particular interface, this
object shall identify the instance of the ifIndex object, defined in [3,5], for the desired interface.

        For example, if an entry were to receive data from
        interface #1, this object would be set to ifIndex.1."
    SYNTAX      OBJECT IDENTIFIER
--
-- Protocol Directory Group
--
-- Lists the inventory of protocols the probe has the capability of
-- monitoring and allows the addition, deletion, and configuration of
-- entries in this list.

protocolDirLastChange OBJECT-TYPE

    SYNTAX      TimeStamp
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The value of sysUpTime at the time the protocol directory
        was last modified, either through insertions or deletions,
        or through modifications of either the
        protocolDirAddressMapConfig, protocolDirHostConfig, or
        protocolDirMatrixConfig."
    ::= { protocolDir 1 }

protocolDirTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF ProtocolDirEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "This table lists the protocols that this agent has the
        capability to decode and count.  There is one entry in this
        table for each such protocol.  These protocols represent
        different network layer, transport layer, and higher-layer
        protocols.  The agent should boot up with this table
        preconfigured with those protocols that it knows about and
        wishes to monitor.  Implementations are strongly encouraged to
        support protocols higher than the network layer (at least for
        the protocol distribution group), even for implementations
        that don't support the application layer groups."
    ::= { protocolDir 2 }

protocolDirEntry OBJECT-TYPE

    SYNTAX      ProtocolDirEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the protocolDirTable.
    
         An example of the indexing of this entry is
         protocolDirLocalIndex.8.0.0.0.1.0.0.8.0.2.0.0, which is the
         encoding of a length of 8, followed by 8 subids encoding the
         protocolDirID of 1.2048, followed by a length of 2 and the
         2 subids encoding zero-valued parameters."
    INDEX { protocolDirID, protocolDirParameters }
    ::= { protocolDirTable  1 }

ProtocolDirEntry ::= SEQUENCE {
    protocolDirID                   OCTET STRING,
    protocolDirParameters           OCTET STRING,
    protocolDirLocalIndex           Integer32,
    protocolDirDescr                DisplayString,
    protocolDirType                 BITS,
    protocolDirAddressMapConfig     INTEGER,
    protocolDirHostConfig           INTEGER,
    protocolDirMatrixConfig         INTEGER,
    protocolDirOwner                OwnerString,
    protocolDirStatus               RowStatus
}

protocolDirID OBJECT-TYPE

    SYNTAX      OCTET STRING
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A unique identifier for a particular protocol.  Standard
        identifiers will be defined in a manner such that they
        can often be used as specifications for new protocols - i.e.
        a tree-structured assignment mechanism that matches the
        protocol encapsulation `tree' and which has algorithmic
        assignment mechanisms for certain subtrees. See RFC XXX for
        more details.

Despite the algorithmic mechanism, the probe will only place entries in here for those protocols it chooses to collect. In other words, it need not populate this table with all of the possible ethernet protocol types, nor need it create them on the fly when it sees them. Whether or not it does these things is a matter of product definition (cost/benefit, usability), and is up to the designer of the product.

        If an entry is written to this table with a protocolDirID that
        the agent doesn't understand, either directly or
        algorithmically, the SET request will be rejected with an
        inconsistentName or badValue (for SNMPv1) error."
    ::= { protocolDirEntry 1 }

protocolDirParameters OBJECT-TYPE

    SYNTAX      OCTET STRING
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A set of parameters for the associated protocolDirID.
        See the associated RMON2 Protocol Identifiers document
        for a description of the possible parameters. There
        will be one octet in this string for each sub-identifier in
        the protocolDirID, and the parameters will appear here in the
        same order as the associated sub-identifiers appear in the
        protocolDirID.
    
        Every node in the protocolDirID tree has a different, optional
        set of parameters defined (that is, the definition of
        parameters for a node is optional).  The proper parameter
        value for each node is included in this string.  Note that the
        inclusion of a parameter value in this string for each node is
        not optional - what is optional is that a node may have no
        parameters defined, in which case the parameter field for that
        node will be zero."
    ::= { protocolDirEntry 2 }

protocolDirLocalIndex OBJECT-TYPE

    SYNTAX      Integer32 (1..2147483647)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The locally arbitrary, but unique identifier associated
        with this protocolDir entry.

The value for each supported protocol must remain constant at least from one re-initialization of the entity's network management system to the next re-initialization, except that if a protocol is deleted and re-created, it must be re-created with a new value that has not been used since the last re-initialization.

        The specific value is meaningful only within a given SNMP
        entity. A protocolDirLocalIndex must not be re-used until the
        next agent-restart in the event the protocol directory entry
        is deleted."
    ::= { protocolDirEntry 3 }

protocolDirDescr OBJECT-TYPE

    SYNTAX      DisplayString (SIZE (1..64))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "A textual description of the protocol encapsulation.
        A probe may choose to describe only a subset of the
        entire encapsulation (e.g. only the highest layer).

This object is intended for human consumption only.

        This object may not be modified if the associated
        protocolDirStatus object is equal to active(1)."
    ::= { protocolDirEntry 4 }

protocolDirType OBJECT-TYPE

    SYNTAX      BITS {
                    extensible(0),
                    addressRecognitionCapable(1)
                }
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "This object describes 2 attributes of this protocol
         directory entry.

The presence or absence of the `extensible' bit describes

whether or not this protocol directory entry can be extended

by the user by creating protocol directory entries which are children of this protocol.

An example of an entry that will often allow extensibility is `ip.udp'. The probe may automatically populate some children of this node such as `ip.udp.snmp' and `ip.udp.dns'.
A probe administrator or user may also populate additional children via remote SNMP requests that create entries in this table. When a child node is added for a protocol for which the probe has no built in support, extending a parent node (for which the probe does have built in support),
that child node is not extendible. This is termed `limited extensibility'.

When a child node is added through this extensibility mechanism, the values of protocolDirLocalIndex and protocolDirType shall be assigned by the agent.

The other objects in the entry will be assigned by the manager who is creating the new entry.

This object also describes whether or not this agent can recognize addresses for this protocol, should it be a network level protocol. That is, while a probe may be able to recognize packets of a particular network layer protocol and count them, it takes additional logic to be able to recognize the addresses in this protocol and to populate network layer or application layer tables with the addresses in this protocol. If this bit is set, the agent will recognize network layer addresses for this protoocl and populate the network and application layer host and matrix tables with these protocols.

         Note that when an entry is created, the agent will supply
         values for the bits that match the capabilities of the agent
         with respect to this protocol.  Note that since row creations
         usually exercise the limited extensibility feature, these
         bits will usually be set to zero."
    ::= { protocolDirEntry 5 }

protocolDirAddressMapConfig OBJECT-TYPE

    SYNTAX      INTEGER {
                    notSupported(1),
                    supportedOff(2),
                    supportedOn(3)
                }
    MAX-ACCESS  read-create
    STATUS      current

DESCRIPTION

"This object describes and configures the probe's support for address mapping for this protocol. When the probe creates entries in this table for all protocols that it understands, it will set the entry to notSupported(1) if it doesn't have the capability to perform address mapping for the protocol or if this protocol is not a network-layer protocol. When an entry is created in this table by a management operation as part of the limited extensibility feature, the probe must set this value to notSupported(1), because limited extensibility of the protocolDirTable does not extend to interpreting addresses of the extended protocols.

        If the value of this object is notSupported(1), the probe
        will not perform address mapping for this protocol and
        shall not allow this object to be changed to any other value.
        If the value of this object is supportedOn(3), the probe
        supports address mapping for this protocol and is configured
        to perform address mapping for this protocol for all
        addressMappingControlEntries and all interfaces.
        If the value of this object is supportedOff(2), the probe
        supports address mapping for this protocol but is configured
        to not perform address mapping for this protocol for any
        addressMappingControlEntries and all interfaces.
        Whenever this value changes from supportedOn(3) to
        supportedOff(2), the probe shall delete all related entries in
        the addressMappingTable."
    ::= { protocolDirEntry 6 }

protocolDirHostConfig OBJECT-TYPE

    SYNTAX      INTEGER {
                    notSupported(1),
                    supportedOff(2),
                    supportedOn(3)
                }
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "This object describes and configures the probe's support for
        the network layer and application layer host tables for this
        protocol.  When the probe creates entries in this table for
        all protocols that it understands, it will set the entry to
        notSupported(1) if it doesn't have the capability to track the
        nlHostTable for this protocol or if the alHostTable is
        implemented but doesn't have the capability to track this
        protocol.  Note that if the alHostTable is implemented, the
        probe may only support a protocol if it is supported in both
        the nlHostTable and the alHostTable.

If the associated protocolDirType object has the addressRecognitionCapable bit set, then this is a network layer protocol for which the probe recognizes addresses, and thus the probe will populate the nlHostTable and alHostTable with addresses it discovers for this protocol.

If the value of this object is notSupported(1), the probe will not track the nlHostTable or alHostTable for this protocol and shall not allow this object to be changed to any other value. If the value of this object is supportedOn(3), the probe supports tracking of the nlHostTable and alHostTable for this protocol and is configured to track both tables for this protocol for all control entries and all interfaces. If the value of this object is supportedOff(2), the probe supports tracking of the nlHostTable and alHostTable for this protocol but is configured to not track these tables
for any control entries or interfaces.
Whenever this value changes from supportedOn(3) to supportedOff(2), the probe shall delete all related entries in the nlHostTable and alHostTable.

        Note that since each alHostEntry references 2 protocol
        directory entries, one for the network address and one for the
        type of the highest protocol recognized, that an entry will
        only be created in that table if this value is supportedOn(3)
        for both protocols."
    ::= { protocolDirEntry 7 }

protocolDirMatrixConfig OBJECT-TYPE

    SYNTAX      INTEGER {
                    notSupported(1),
                    supportedOff(2),
                    supportedOn(3)
                }
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "This object describes and configures the probe's support for
        the network layer and application layer matrix tables for this
        protocol.  When the probe creates entries in this table for
        all protocols that it understands, it will set the entry to
        notSupported(1) if it doesn't have the capability to track the
        nlMatrixTables for this protocol or if the alMatrixTables are
        implemented but don't have the capability to track this
        protocol.  Note that if the alMatrix tables are implemented,
        the probe may only support a protocol if it is supported in
        the the both of the nlMatrixTables and both of the
        alMatrixTables.

If the associated protocolDirType object has the addressRecognitionCapable bit set, then this is a network layer protocol for which the probe recognizes addresses, and thus the probe will populate both of the nlMatrixTables and both of the alMatrixTables with addresses it discovers for this protocol.

If the value of this object is notSupported(1), the probe will not track either of the nlMatrixTables or the alMatrixTables for this protocol and shall not allow this object to be changed to any other value. If the value of this object is supportedOn(3), the probe supports tracking of both of the nlMatrixTables and (if implemented) both of the alMatrixTables for this protocol and is configured to track these tables for this protocol for all control entries and all interfaces. If the value of this object is supportedOff(2), the probe supports tracking of both of the nlMatrixTables and (if implemented) both of the alMatrixTables for this protocol but is configured to not track these tables for this protocol for any control entries or interfaces.
Whenever this value changes from supportedOn(3) to supportedOff(2), the probe shall delete all related entries in the nlMatrixTables and the alMatrixTables.

        Note that since each alMatrixEntry references 2 protocol
        directory entries, one for the network address and one for the
        type of the highest protocol recognized, that an entry will
        only be created in that table if this value is supportedOn(3)
        for both protocols."
    ::= { protocolDirEntry 8 }

protocolDirOwner OBJECT-TYPE

    SYNTAX      OwnerString
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The entity that configured this entry and is
        therefore using the resources assigned to it."
    ::= { protocolDirEntry 9 }

protocolDirStatus OBJECT-TYPE

    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The status of this protocol directory entry.

An entry may not exist in the active state unless all

objects in the entry have an appropriate value.

        If this object is not equal to active(1), all associated
        entries in the nlHostTable, nlMatrixSDTable, nlMatrixDSTable,
        alHostTable, alMatrixSDTable, and alMatrixDSTable shall be
        deleted."
    ::= { protocolDirEntry 10 }

--
-- Protocol Distribution Group  (protocolDist)
--
-- Collects the relative amounts of octets and packets for the
-- different protocols detected on a network segment.
--    protocolDistControlTable,
--    protocolDistStatsTable

protocolDistControlTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF ProtocolDistControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "Controls the setup of protocol type distribution statistics
        tables.

Implementations are encouraged to add an entry per monitored

interface upon initialization so that a default collection

of protocol statistics is available.

Rationale:
This table controls collection of very basic statistics for any or all of the protocols detected on a given interface. An NMS can use this table to quickly determine bandwidth allocation utilized by different protocols.

        A media-specific statistics collection could also
        be configured (e.g. etherStats, trPStats) to easily obtain
        total frame, octet, and droppedEvents for the same
        interface."
    ::= { protocolDist 1 }

protocolDistControlEntry OBJECT-TYPE

    SYNTAX      ProtocolDistControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the protocolDistControlTable.

An example of the indexing of this entry is

         protocolDistControlDroppedFrames.7"
    INDEX { protocolDistControlIndex }
    ::= { protocolDistControlTable 1 }

ProtocolDistControlEntry ::= SEQUENCE {
    protocolDistControlIndex                Integer32,
    protocolDistControlDataSource           DataSource,
    protocolDistControlDroppedFrames        Counter32,
    protocolDistControlCreateTime           LastCreateTime,
    protocolDistControlOwner                OwnerString,
    protocolDistControlStatus               RowStatus
}

protocolDistControlIndex OBJECT-TYPE

    SYNTAX      Integer32 (1..65535)
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A unique index for this protocolDistControlEntry."
    ::= { protocolDistControlEntry 1 }

protocolDistControlDataSource OBJECT-TYPE

    SYNTAX      DataSource
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The source of data for the this protocol distribution.

The statistics in this group reflect all packets
on the local network segment attached to the identified interface.

        This object may not be modified if the associated
        protocolDistControlStatus object is equal to active(1)."
    ::= { protocolDistControlEntry 2 }

protocolDistControlDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
    
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this
        collection.

This count does not include packets that were not counted because they had MAC-layer errors.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { protocolDistControlEntry 3 }

protocolDistControlCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this control entry was last
        activated. This can be used by the management station to
        ensure that the table has not been deleted and recreated
        between polls."
    ::= { protocolDistControlEntry 4 }

protocolDistControlOwner OBJECT-TYPE

    SYNTAX      OwnerString
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The entity that configured this entry and is
        therefore using the resources assigned to it."
    ::= { protocolDistControlEntry 5 }

protocolDistControlStatus OBJECT-TYPE

    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The status of this row.

An entry may not exist in the active state unless all objects in the entry have an appropriate value.

        If this object is not equal to active(1), all associated
        entries in the protocolDistStatsTable shall be deleted."
    ::= { protocolDistControlEntry 6 }

-- per interface protocol distribution statistics table protocolDistStatsTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF ProtocolDistStatsEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "An entry is made in this table for every protocol in the

protocolDirTable which has been seen in at least one packet. Counters are updated in this table for every protocol type that is encountered when parsing a packet, but no counters are updated for packets with MAC-layer errors.

        Note that if a protocolDirEntry is deleted, all associated
        entries in this table are removed."
    ::= { protocolDist 2 }

protocolDistStatsEntry OBJECT-TYPE

    SYNTAX      ProtocolDistStatsEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the protocolDistStatsTable.

The index is composed of the protocolDistControlIndex of the associated protocolDistControlEntry followed by the protocolDirLocalIndex of the associated protocol that this entry represents. In other words, the index identifies the protocol distribution an entry is a part of as well as the particular protocol that it represents.

        An example of the indexing of this entry is
        protocolDistStatsPkts.1.18"
    INDEX { protocolDistControlIndex, protocolDirLocalIndex }
    ::= { protocolDistStatsTable 1 }

ProtocolDistStatsEntry ::= SEQUENCE {
    protocolDistStatsPkts                    ZeroBasedCounter32,
    protocolDistStatsOctets                  ZeroBasedCounter32
}

protocolDistStatsPkts OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of packets without errors received of this
        protocol type.  Note that this is the number of link-layer
        packets, so if a single network-layer packet is fragmented
        into several link-layer frames, this counter is incremented
        several times."
    ::= { protocolDistStatsEntry 1 }

protocolDistStatsOctets OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of octets in packets received of this protocol
        type since it was added to the protocolDistStatsTable
        (excluding framing bits but including FCS octets), except for
        those octets in packets that contained errors.
    
        Note this doesn't count just those octets in the particular
        protocol frames, but includes the entire packet that contained
        the protocol."
    ::= { protocolDistStatsEntry 2 }

--
-- Address Map Group   (addressMap)
--
-- Lists MAC address to network address bindings discovered by the
-- probe and what interface they were last seen on.
--    addressMapControlTable
--    addressMapTable

addressMapInserts OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of times an address mapping entry has been
        inserted into the addressMapTable.  If an entry is inserted,
        then deleted, and then inserted, this counter will be
        incremented by 2.
    
        Note that the table size can be determined by subtracting
        addressMapDeletes from addressMapInserts."
    ::= { addressMap 1 }

addressMapDeletes OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of times an address mapping entry has been
        deleted from the addressMapTable (for any reason).  If
        an entry is deleted, then inserted, and then deleted, this
        counter will be incremented by 2.
    
        Note that the table size can be determined by subtracting
        addressMapDeletes from addressMapInserts."
    ::= { addressMap 2 }

addressMapMaxDesiredEntries OBJECT-TYPE

    SYNTAX      Integer32 (-1..2147483647)
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
        "The maximum number of entries that are desired in the
        addressMapTable. The probe will not create more than
        this number of entries in the table, but may choose to create
        fewer entries in this table for any reason including the lack
        of resources.

If this object is set to a value less than the current number of entries, enough entries are chosen in an implementation-dependent manner and deleted so that the number of entries in the table equals the value of this object.

If this value is set to -1, the probe may create any number of entries in this table.

        This object may be used to control how resources are allocated
        on the probe for the various RMON functions."
    ::= { addressMap 3 }

addressMapControlTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF AddressMapControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A table to control the collection of network layer address to
        physical address to interface mappings.

Note that this is not like the typical RMON
controlTable and dataTable in which each entry creates
its own data table. Each entry in this table enables the discovery of addresses on a new interface and the placement of address mappings into the central addressMapTable.

        Implementations are encouraged to add an entry per monitored
        interface upon initialization so that a default collection
        of address mappings is available."
    ::= { addressMap 4 }

addressMapControlEntry OBJECT-TYPE

    SYNTAX      AddressMapControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the addressMapControlTable.
    
        An example of the indexing of this entry is
        addressMapControlDroppedFrames.1"
    INDEX { addressMapControlIndex }
    ::= { addressMapControlTable 1 }

AddressMapControlEntry ::= SEQUENCE {
    addressMapControlIndex              Integer32,
    addressMapControlDataSource         DataSource,
    addressMapControlDroppedFrames      Counter32,
    addressMapControlOwner              OwnerString,
    addressMapControlStatus             RowStatus
}

addressMapControlIndex OBJECT-TYPE

    SYNTAX      Integer32 (1..65535)
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A unique index for this entry in the addressMapControlTable."
    ::= { addressMapControlEntry 1 }

addressMapControlDataSource OBJECT-TYPE

    SYNTAX      DataSource
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The source of data for this addressMapControlEntry."
    ::= { addressMapControlEntry 2 }

addressMapControlDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this
        collection.

This count does not include packets that were not counted because they had MAC-layer errors.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { addressMapControlEntry 3 }

addressMapControlOwner OBJECT-TYPE

    SYNTAX      OwnerString
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The entity that configured this entry and is
        therefore using the resources assigned to it."
    ::= { addressMapControlEntry 4 }

addressMapControlStatus OBJECT-TYPE

    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The status of this addressMap control entry.

An entry may not exist in the active state unless all objects in the entry have an appropriate value.

        If this object is not equal to active(1), all associated
        entries in the addressMapTable shall be deleted."
    ::= { addressMapControlEntry 5 }

addressMapTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF AddressMapEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A table of network layer address to physical address to
        interface mappings.
    
        The probe will add entries to this table based on the source
        MAC and network addresses seen in packets without MAC-level
        errors. The probe will populate this table for all protocols
        in the protocol directory table whose value of
        protocolDirAddressMapConfig is equal to supportedOn(3), and
        will delete any entries whose protocolDirEntry is deleted or
        has a protocolDirAddressMapConfig value of supportedOff(2)."
    ::= { addressMap 5 }

addressMapEntry OBJECT-TYPE

    SYNTAX      AddressMapEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the addressMapTable.
        The protocolDirLocalIndex in the index identifies the network
        layer protocol of the addressMapNetworkAddress.
    
        An example of the indexing of this entry is
        addressMapSource.783495.18.4.128.2.6.6.11.1.3.6.1.2.1.2.2.1.1.1"
    INDEX { addressMapTimeMark, protocolDirLocalIndex,
            addressMapNetworkAddress, addressMapSource }
    ::= { addressMapTable 1 }

AddressMapEntry ::= SEQUENCE {
    addressMapTimeMark                 TimeFilter,
    addressMapNetworkAddress           OCTET STRING,
    addressMapSource                   OBJECT IDENTIFIER,
    addressMapPhysicalAddress          OCTET STRING,
    addressMapLastChange               TimeStamp
}

addressMapTimeMark OBJECT-TYPE

    SYNTAX      TimeFilter
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A TimeFilter for this entry.  See the TimeFilter textual
        convention to see how this works."
    ::= { addressMapEntry 1 }

addressMapNetworkAddress OBJECT-TYPE

    SYNTAX      OCTET STRING
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "The network address for this relation.

This is represented as an octet string with
specific semantics and length as identified
by the protocolDirLocalIndex component of the
index.

        For example, if the protocolDirLocalIndex indicates an
        encapsulation of ip, this object is encoded as a length
        octet of 4, followed by the 4 octets of the ip address,
        in network byte order."
    ::= { addressMapEntry 2 }

addressMapSource OBJECT-TYPE

    SYNTAX      OBJECT IDENTIFIER
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "The interface or port on which the associated network
         address was most recently seen.

If this address mapping was discovered on an interface, this object shall identify the instance of the ifIndex object, defined in [3,5], for the desired interface. For example, if an entry were to receive data from interface #1, this object would be set to ifIndex.1.

If this address mapping was discovered on a port, this object shall identify the instance of the rptrGroupPortIndex object, defined in [RFC1516], for the desired port. For example, if an entry were to receive data from
group #1, port #1, this object would be set to rptrGroupPortIndex.1.1.

        Note that while the dataSource associated with this entry
        may only point to index objects, this object may at times
        point to repeater port objects. This situation occurs when
        the dataSource points to an interface which is a locally
        attached repeater and the agent has additional information
        about the source port of traffic seen on that repeater."
    ::= { addressMapEntry 3 }

addressMapPhysicalAddress OBJECT-TYPE

    SYNTAX      OCTET STRING
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The last source physical address on which the associated
        network address was seen.  If the protocol of the associated
        network address was encapsulated inside of a network-level or
        higher protocol, this will be the address of the next-lower
        protocol with the addressRecognitionCapable bit enabled and
        will be formatted as specified for that protocol."
    ::= { addressMapEntry 4 }

addressMapLastChange OBJECT-TYPE

    SYNTAX      TimeStamp
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The value of sysUpTime at the time this entry was last
        created or the values of the physical address changed.
    
        This can be used to help detect duplicate address problems, in
        which case this object will be updated frequently."
    ::= { addressMapEntry 5 }

--

-- Network Layer Host Group

--
-- Counts the amount of traffic sent from and to each network address -- discovered by the probe.
-- Note that while the hlHostControlTable also has objects that -- control an optional alHostTable, implementation of the alHostTable is -- not required to fully implement this group.

hlHostControlTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF HlHostControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A list of higher layer (i.e. non-MAC) host table control entries.

These entries will enable the collection of the network and application level host tables indexed by network addresses. Both the network and application level host tables are controlled by this table is so that they will both be created and deleted at the same time, further increasing the ease with which they can be implemented as a single datastore (note that if an implementation stores application layer host records in memory, it can derive network layer host records from them).

Entries in the nlHostTable will be created on behalf of each entry in this table. Additionally, if this probe implements the alHostTable, entries in the alHostTable will be created on behalf of each entry in this table.

        Implementations are encouraged to add an entry per monitored
        interface upon initialization so that a default collection
        of host statistics is available."
    ::= { nlHost 1 }

hlHostControlEntry OBJECT-TYPE

    SYNTAX      HlHostControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the hlHostControlTable.
    
        An example of the indexing of this entry is
        hlHostControlNlDroppedFrames.1"
    INDEX { hlHostControlIndex }
    ::= { hlHostControlTable 1 }

HlHostControlEntry ::= SEQUENCE {

    hlHostControlIndex               Integer32,
    hlHostControlDataSource          DataSource,

    hlHostControlNlDroppedFrames     Counter32,
    hlHostControlNlInserts           Counter32,
    hlHostControlNlDeletes           Counter32,
    hlHostControlNlMaxDesiredEntries Integer32,
    hlHostControlAlDroppedFrames     Counter32,
    hlHostControlAlInserts           Counter32,
    hlHostControlAlDeletes           Counter32,
    hlHostControlAlMaxDesiredEntries Integer32,
    hlHostControlOwner               OwnerString,
    hlHostControlStatus              RowStatus
}

hlHostControlIndex OBJECT-TYPE

    SYNTAX      Integer32 (1..65535)
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "An index that uniquely identifies an entry in the
        hlHostControlTable.  Each such entry defines
        a function that discovers hosts on a particular
        interface and places statistics about them in the
        nlHostTable, and optionally in the alHostTable, on
        behalf of this hlHostControlEntry."
    ::= { hlHostControlEntry 1 }

hlHostControlDataSource OBJECT-TYPE

    SYNTAX      DataSource
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The source of data for the associated host tables.

The statistics in this group reflect all packets
on the local network segment attached to the identified interface.

        This object may not be modified if the associated
        hlHostControlStatus object is equal to active(1)."
    ::= { hlHostControlEntry 2 }

hlHostControlNlDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
    
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for the associated

nlHost entries for whatever reason. Most often, this event

occurs when the probe is out of some resources and decides to

shed load from this collection.

This count does not include packets that were not counted because they had MAC-layer errors.

Note that if the nlHostTable is inactive because no protocols

are enabled in the protocol directory, this value should be 0.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { hlHostControlEntry 3 }

hlHostControlNlInserts OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of times an nlHost entry has been
        inserted into the nlHost table.  If an entry is inserted, then
        deleted, and then inserted, this counter will be incremented
        by 2.

To allow for efficient implementation strategies, agents may delay updating this object for short periods of time. For example, an implementation strategy may allow internal data structures to differ from those visible via SNMP for short periods of time. This counter may reflect the internal data structures for those short periods of time.

        Note that the table size can be determined by subtracting
        hlHostControlNlDeletes from hlHostControlNlInserts."
    ::= { hlHostControlEntry 4 }

hlHostControlNlDeletes OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of times an nlHost entry has been
        deleted from the nlHost table (for any reason).  If an entry
        is deleted, then inserted, and then deleted, this counter will
        be incremented by 2.

To allow for efficient implementation strategies, agents may

delay updating this object for short periods of time. For

example, an implementation strategy may allow internal

data structures to differ from those visible via SNMP for

short periods of time. This counter may reflect the internal

data structures for those short periods of time.

        Note that the table size can be determined by subtracting
        hlHostControlNlDeletes from hlHostControlNlInserts."
    ::= { hlHostControlEntry 5 }

hlHostControlNlMaxDesiredEntries OBJECT-TYPE

    SYNTAX      Integer32 (-1..2147483647)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The maximum number of entries that are desired in the
        nlHostTable on behalf of this control entry. The probe will
        not create more than this number of associated entries in the
        table, but may choose to create fewer entries in this table
        for any reason including the lack of resources.

If this object is set to a value less than the current number of entries, enough entries are chosen in an implementation-dependent manner and deleted so that the number of entries in the table equals the value of this object.

If this value is set to -1, the probe may create any number of entries in this table. If the associated hlHostControlStatus object is equal to `active', this object may not be modified.

        This object may be used to control how resources are allocated
        on the probe for the various RMON functions."
    ::= { hlHostControlEntry 6 }

hlHostControlAlDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
    
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for the associated
        alHost entries for whatever reason.  Most often, this event
        occurs when the probe is out of some resources and decides to
        shed load from this collection.

This count does not include packets that were not counted because they had MAC-layer errors.

Note that if the alHostTable is not implemented or is inactive

because no protocols are enabled in the protocol directory,

this value should be 0.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { hlHostControlEntry 7 }

hlHostControlAlInserts OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of times an alHost entry has been
        inserted into the alHost table.  If an entry is inserted, then
        deleted, and then inserted, this counter will be incremented
        by 2.

To allow for efficient implementation strategies, agents may delay updating this object for short periods of time. For example, an implementation strategy may allow internal data structures to differ from those visible via SNMP for short periods of time. This counter may reflect the internal data structures for those short periods of time.

        Note that the table size can be determined by subtracting
        hlHostControlAlDeletes from hlHostControlAlInserts."
    ::= { hlHostControlEntry 8 }

hlHostControlAlDeletes OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of times an alHost entry has been
        deleted from the alHost table (for any reason).  If an entry
        is deleted, then inserted, and then deleted, this counter will
        be incremented by 2.

To allow for efficient implementation strategies, agents may delay updating this object for short periods of time. For example, an implementation strategy may allow internal data structures to differ from those visible via SNMP for short periods of time. This counter may reflect the internal data structures for those short periods of time.

Note that the table size can be determined by subtracting hlHostControlAlDeletes from hlHostControlAlInserts."

    ::= { hlHostControlEntry 9 }

hlHostControlAlMaxDesiredEntries OBJECT-TYPE

    SYNTAX      Integer32 (-1..2147483647)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The maximum number of entries that are desired in the alHost
        table on behalf of this control entry. The probe will not
        create more than this number of associated entries in the
        table, but may choose to create fewer entries in this table
        for any reason including the lack of resources.

If this object is set to a value less than the current number of entries, enough entries are chosen in an implementation-dependent manner and deleted so that the number of entries in the table equals the value of this object.

If this value is set to -1, the probe may create any number of entries in this table. If the associated hlHostControlStatus object is equal to `active', this object may not be modified.

        This object may be used to control how resources are allocated
        on the probe for the various RMON functions."
    ::= { hlHostControlEntry 10 }

hlHostControlOwner OBJECT-TYPE

    SYNTAX      OwnerString
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The entity that configured this entry and is
        therefore using the resources assigned to it."
    ::= { hlHostControlEntry 11 }

hlHostControlStatus OBJECT-TYPE

    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The status of this hlHostControlEntry.

An entry may not exist in the active state unless all objects in the entry have an appropriate value.

If this object is not equal to active(1), all associated

entries in the nlHostTable and alHostTable shall be deleted."

    ::= { hlHostControlEntry 12 }

nlHostTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF NlHostEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A collection of statistics for a particular network layer
        address that has been discovered on an interface of this
        device.

The probe will populate this table for all network layer protocols in the protocol directory table whose value of protocolDirHostConfig is equal to supportedOn(3), and will delete any entries whose protocolDirEntry is deleted or has a protocolDirHostConfig value of supportedOff(2).

        The probe will add to this table all addresses seen
        as the source or destination address in all packets with no
        MAC errors, and will increment octet and packet counts in the
        table for all packets with no MAC errors."
::= { nlHost 2 }

nlHostEntry OBJECT-TYPE

    SYNTAX      NlHostEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the nlHostTable.

The hlHostControlIndex value in the index identifies the hlHostControlEntry on whose behalf this entry was created. The protocolDirLocalIndex value in the index identifies the network layer protocol of the nlHostAddress.

        An example of the indexing of this entry is
        nlHostOutPkts.1.783495.18.4.128.2.6.6."
    INDEX { hlHostControlIndex, nlHostTimeMark,
            protocolDirLocalIndex, nlHostAddress }
    ::= { nlHostTable 1 }

NlHostEntry ::= SEQUENCE {

    nlHostTimeMark              TimeFilter,
    nlHostAddress               OCTET STRING,
    nlHostInPkts                ZeroBasedCounter32,
    nlHostOutPkts               ZeroBasedCounter32,
    nlHostInOctets              ZeroBasedCounter32,
    nlHostOutOctets             ZeroBasedCounter32,

    nlHostOutMacNonUnicastPkts  ZeroBasedCounter32,
    nlHostCreateTime            LastCreateTime
}

nlHostTimeMark OBJECT-TYPE

    SYNTAX      TimeFilter
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A TimeFilter for this entry.  See the TimeFilter textual
        convention to see how this works."
    ::= { nlHostEntry 1 }

nlHostAddress OBJECT-TYPE

    SYNTAX      OCTET STRING
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "The network address for this nlHostEntry.

This is represented as an octet string with
specific semantics and length as identified
by the protocolDirLocalIndex component of the index.

        For example, if the protocolDirLocalIndex indicates an
        encapsulation of ip, this object is encoded as a length
        octet of 4, followed by the 4 octets of the ip address,
        in network byte order."
    ::= { nlHostEntry 2 }

nlHostInPkts OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of packets without errors transmitted to
        this address since it was added to the nlHostTable.  Note that
        this is the number of link-layer packets, so if a single
        network-layer packet is fragmented into several link-layer
        frames, this counter is incremented several times."
    ::= { nlHostEntry 3 }

nlHostOutPkts OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of packets without errors transmitted by
    
        this address since it was added to the nlHostTable.  Note that
        this is the number of link-layer packets, so if a single
        network-layer packet is fragmented into several link-layer
        frames, this counter is incremented several times."
    ::= { nlHostEntry 4 }

nlHostInOctets OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of octets transmitted to this address
        since it was added to the nlHostTable (excluding
        framing bits but including FCS octets), excluding
        those octets in packets that contained errors.
    
        Note this doesn't count just those octets in the particular
        protocol frames, but includes the entire packet that contained
        the protocol."
    ::= { nlHostEntry 5 }

nlHostOutOctets OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of octets transmitted by this address
        since it was added to the nlHostTable (excluding
        framing bits but including FCS octets), excluding
        those octets in packets that contained errors.
    
        Note this doesn't count just those octets in the particular
        protocol frames, but includes the entire packet that contained
        the protocol."
    ::= { nlHostEntry 6 }

nlHostOutMacNonUnicastPkts OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of packets without errors transmitted by this
        address that were directed to any MAC broadcast addresses
        or to any MAC multicast addresses since this host was
        added to the nlHostTable. Note that this is the number of
        link-layer packets, so if a single network-layer packet is
        fragmented into several link-layer frames, this counter is
        incremented several times."
    
    ::= { nlHostEntry 7 }

nlHostCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this entry was last activated.
        This can be used by the management station to ensure that the
        entry has not been deleted and recreated between polls."
    ::= { nlHostEntry 8 }

--
-- Network Layer Matrix Group
--
-- Counts the amount of traffic sent between each pair of network -- addresses discovered by the probe.
-- Note that while the hlMatrixControlTable also has objects that -- control optional alMatrixTables, implementation of the -- alMatrixTables is not required to fully implement this group.

hlMatrixControlTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF HlMatrixControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A list of higher layer (i.e. non-MAC) matrix control entries.

These entries will enable the collection of the network and application level matrix tables containing conversation statistics indexed by pairs of network addresses.
Both the network and application level matrix tables are controlled by this table is so that they will both be created and deleted at the same time, further increasing the ease with which they can be implemented as a single datastore (note that if an implementation stores application layer matrix records in memory, it can derive network layer matrix records from them).

        Entries in the nlMatrixSDTable and nlMatrixDSTable will be
        created on behalf of each entry in this table.  Additionally,
        if this probe implements the alMatrix tables, entries in the
        alMatrix tables will be created on behalf of each entry in
        this table."
    ::= { nlMatrix 1 }

hlMatrixControlEntry OBJECT-TYPE

SYNTAX HlMatrixControlEntry

    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the hlMatrixControlTable.
    
        An example of indexing of this entry is
        hlMatrixControlNlDroppedFrames.1"
    INDEX { hlMatrixControlIndex }
    ::= { hlMatrixControlTable 1 }

HlMatrixControlEntry ::= SEQUENCE {
    hlMatrixControlIndex                  Integer32,
    hlMatrixControlDataSource             DataSource,
    hlMatrixControlNlDroppedFrames        Counter32,
    hlMatrixControlNlInserts              Counter32,
    hlMatrixControlNlDeletes              Counter32,
    hlMatrixControlNlMaxDesiredEntries    Integer32,
    hlMatrixControlAlDroppedFrames        Counter32,
    hlMatrixControlAlInserts              Counter32,
    hlMatrixControlAlDeletes              Counter32,
    hlMatrixControlAlMaxDesiredEntries    Integer32,
    hlMatrixControlOwner                  OwnerString,
    hlMatrixControlStatus                 RowStatus
}

hlMatrixControlIndex OBJECT-TYPE

    SYNTAX      Integer32 (1..65535)
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "An index that uniquely identifies an entry in the
        hlMatrixControlTable.  Each such entry defines
        a function that discovers conversations on a particular
        interface and places statistics about them in the
        nlMatrixSDTable and the nlMatrixDSTable, and optionally the
        alMatrixSDTable and alMatrixDSTable, on behalf of this
        hlMatrixControlEntry."
    ::= { hlMatrixControlEntry 1 }

hlMatrixControlDataSource OBJECT-TYPE

    SYNTAX      DataSource
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The source of the data for the associated matrix tables.

The statistics in this group reflect all packets
on the local network segment attached to the identified interface.

        This object may not be modified if the associated
        hlMatrixControlStatus object is equal to active(1)."
    ::= { hlMatrixControlEntry 2 }

hlMatrixControlNlDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
    
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this
        collection.

This count does not include packets that were not counted because they had MAC-layer errors.

Note that if the nlMatrixTables are inactive because no

protocols are enabled in the protocol directory, this value

should be 0.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { hlMatrixControlEntry 3 }

hlMatrixControlNlInserts OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of times an nlMatrix entry has been
        inserted into the nlMatrix tables.  If an entry is inserted,
        then deleted, and then inserted, this counter will be
        incremented by 2.  The addition of a conversation into both
        the nlMatrixSDTable and nlMatrixDSTable shall be counted as
        two insertions (even though every addition into one table must
        be accompanied by an insertion into the other).

To allow for efficient implementation strategies, agents may delay updating this object for short periods of time. For example, an implementation strategy may allow internal data structures to differ from those visible via SNMP for short periods of time. This counter may reflect the internal data structures for those short periods of time.

        Note that the sum of then nlMatrixSDTable and nlMatrixDSTable
        sizes can be determined by subtracting
        hlMatrixControlNlDeletes from hlMatrixControlNlInserts."
    ::= { hlMatrixControlEntry 4 }

hlMatrixControlNlDeletes OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of times an nlMatrix entry has been
        deleted from the nlMatrix tables (for any reason).  If an
        entry is deleted, then inserted, and then deleted, this
        counter will be incremented by 2.  The deletion of a
        conversation from both the nlMatrixSDTable and nlMatrixDSTable
        shall be counted as two deletions (even though every deletion
        from one table must be accompanied by a deletion from the
        other).

To allow for efficient implementation strategies, agents may delay updating this object for short periods of time. For example, an implementation strategy may allow internal data structures to differ from those visible via SNMP for short periods of time. This counter may reflect the internal data structures for those short periods of time.

        Note that the table size can be determined by subtracting
        hlMatrixControlNlDeletes from hlMatrixControlNlInserts."
    ::= { hlMatrixControlEntry 5 }

hlMatrixControlNlMaxDesiredEntries OBJECT-TYPE

    SYNTAX      Integer32 (-1..2147483647)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The maximum number of entries that are desired in the
        nlMatrix tables on behalf of this control entry. The probe
        will not create more than this number of associated entries in
        the table, but may choose to create fewer entries in this
        table for any reason including the lack of resources.

If this object is set to a value less than the current number of entries, enough entries are chosen in an implementation-dependent manner and deleted so that the number of entries in the table equals the value of this object.

If this value is set to -1, the probe may create any number of entries in this table. If the associated hlMatrixControlStatus object is equal to `active', this object may not be modified.

        This object may be used to control how resources are allocated
        on the probe for the various RMON functions."
    ::= { hlMatrixControlEntry 6 }

hlMatrixControlAlDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
    
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this
        collection.

This count does not include packets that were not counted because they had MAC-layer errors.

Note that if the alMatrixTables are not implemented or are

inactive because no protocols are enabled in the protocol

directory, this value should be 0.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { hlMatrixControlEntry 7 }

hlMatrixControlAlInserts OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of times an alMatrix entry has been
        inserted into the alMatrix tables.  If an entry is inserted,
        then deleted, and then inserted, this counter will be
        incremented by 2.  The addition of a conversation into both
        the alMatrixSDTable and alMatrixDSTable shall be counted as
        two insertions (even though every addition into one table must
        be accompanied by an insertion into the other).

To allow for efficient implementation strategies, agents may delay updating this object for short periods of time. For example, an implementation strategy may allow internal data structures to differ from those visible via SNMP for short periods of time. This counter may reflect the internal data structures for those short periods of time.

        Note that the table size can be determined by subtracting
        hlMatrixControlAlDeletes from hlMatrixControlAlInserts."
    ::= { hlMatrixControlEntry 8 }

hlMatrixControlAlDeletes OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of times an alMatrix entry has been
        deleted from the alMatrix tables.  If an entry is deleted,
        then inserted, and then deleted, this counter will be
        incremented by 2.  The deletion of a conversation from both
        the alMatrixSDTable and alMatrixDSTable shall be counted as
        two deletions (even though every deletion from one table must
        be accompanied by a deletion from the other).

To allow for efficient implementation strategies, agents may delay updating this object for short periods of time. For example, an implementation strategy may allow internal data structures to differ from those visible via SNMP for short periods of time. This counter may reflect the internal data structures for those short periods of time.

        Note that the table size can be determined by subtracting
        hlMatrixControlAlDeletes from hlMatrixControlAlInserts."
    ::= { hlMatrixControlEntry 9 }

hlMatrixControlAlMaxDesiredEntries OBJECT-TYPE

    SYNTAX      Integer32 (-1..2147483647)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The maximum number of entries that are desired in the
        alMatrix tables on behalf of this control entry. The probe
        will not create more than this number of associated entries in
        the table, but may choose to create fewer entries in this
        table for any reason including the lack of resources.

If this object is set to a value less than the current number of entries, enough entries are chosen in an implementation-dependent manner and deleted so that the number of entries in the table equals the value of this object.

If this value is set to -1, the probe may create any number of entries in this table. If the associated hlMatrixControlStatus object is equal to `active', this object may not be modified.

        This object may be used to control how resources are allocated
        on the probe for the various RMON functions."
    ::= { hlMatrixControlEntry 10 }

hlMatrixControlOwner OBJECT-TYPE

    SYNTAX      OwnerString
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The entity that configured this entry and is
        therefore using the resources assigned to it."
    ::= { hlMatrixControlEntry 11 }

hlMatrixControlStatus OBJECT-TYPE

    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The status of this hlMatrixControlEntry.

An entry may not exist in the active state unless all objects in the entry have an appropriate value.

        If this object is not equal to active(1), all
        associated entries in the nlMatrixSDTable,
        nlMatrixDSTable, alMatrixSDTable, and the alMatrixDSTable
        shall be deleted by the agent."
    ::= { hlMatrixControlEntry 12 }

nlMatrixSDTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF NlMatrixSDEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A list of traffic matrix entries which collect statistics for
        conversations between two network-level addresses.  This table
        is indexed first by the source address and then by the
        destination address to make it convenient to collect all
        conversations from a particular address.

The probe will populate this table for all network layer protocols in the protocol directory table whose value of protocolDirMatrixConfig is equal to supportedOn(3), and will delete any entries whose protocolDirEntry is deleted or has a protocolDirMatrixConfig value of supportedOff(2).

The probe will add to this table all pairs of addresses seen in all packets with no MAC errors, and will increment octet and packet counts in the table for all packets with no MAC errors.

        Further, this table will only contain entries that have a
        corresponding entry in the nlMatrixDSTable with the same
        source address and destination address."
    ::= { nlMatrix 2 }

nlMatrixSDEntry OBJECT-TYPE

    SYNTAX      NlMatrixSDEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the nlMatrixSDTable.

The hlMatrixControlIndex value in the index identifies the hlMatrixControlEntry on whose behalf this entry was created. The protocolDirLocalIndex value in the index identifies the network layer protocol of the nlMatrixSDSourceAddress and nlMatrixSDDestAddress.

        An example of the indexing of this table is
        nlMatrixSDPkts.1.783495.18.4.128.2.6.6.4.128.2.6.7"
    INDEX { hlMatrixControlIndex, nlMatrixSDTimeMark,
            protocolDirLocalIndex,
            nlMatrixSDSourceAddress, nlMatrixSDDestAddress }
    ::= { nlMatrixSDTable 1 }

NlMatrixSDEntry ::= SEQUENCE {
    nlMatrixSDTimeMark              TimeFilter,
    nlMatrixSDSourceAddress         OCTET STRING,
    nlMatrixSDDestAddress           OCTET STRING,
    nlMatrixSDPkts                  ZeroBasedCounter32,
    nlMatrixSDOctets                ZeroBasedCounter32,
    nlMatrixSDCreateTime            LastCreateTime
}

nlMatrixSDTimeMark OBJECT-TYPE

    SYNTAX      TimeFilter
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A TimeFilter for this entry.  See the TimeFilter textual
        convention to see how this works."
    ::= { nlMatrixSDEntry 1 }

nlMatrixSDSourceAddress OBJECT-TYPE

    SYNTAX      OCTET STRING
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "The network source address for this nlMatrixSDEntry.

This is represented as an octet string with
specific semantics and length as identified
by the protocolDirLocalIndex component of the index.

        For example, if the protocolDirLocalIndex indicates an
        encapsulation of ip, this object is encoded as a length
        octet of 4, followed by the 4 octets of the ip address,
        in network byte order."
    ::= { nlMatrixSDEntry 2 }

nlMatrixSDDestAddress OBJECT-TYPE

    SYNTAX      OCTET STRING
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "The network destination address for this
        nlMatrixSDEntry.

This is represented as an octet string with
specific semantics and length as identified
by the protocolDirLocalIndex component of the index.

        For example, if the protocolDirLocalIndex indicates an
        encapsulation of ip, this object is encoded as a length
        octet of 4, followed by the 4 octets of the ip address,
        in network byte order."
    ::= { nlMatrixSDEntry 3 }

nlMatrixSDPkts OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of packets without errors transmitted from the
        source address to the destination address since this entry was
        added to the nlMatrixSDTable.  Note that this is the number of
        link-layer packets, so if a single network-layer packet is
        fragmented into several link-layer frames, this counter is
        incremented several times."
    ::= { nlMatrixSDEntry 4 }

nlMatrixSDOctets OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of octets transmitted from the source address to
        the destination address since this entry was added to the
        nlMatrixSDTable (excluding framing bits but
        including FCS octets), excluding those octets in packets that
        contained errors.
    
        Note this doesn't count just those octets in the particular
        protocol frames, but includes the entire packet that contained
        the protocol."
    ::= { nlMatrixSDEntry 5 }

nlMatrixSDCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this entry was last activated.
        This can be used by the management station to ensure that the
        entry has not been deleted and recreated between polls."
    ::= { nlMatrixSDEntry 6 }

-- Traffic matrix tables from destination to source

nlMatrixDSTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF NlMatrixDSEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A list of traffic matrix entries which collect statistics for
        conversations between two network-level addresses.  This table
        is indexed first by the destination address and then by the
        source address to make it convenient to collect all
        conversations to a particular address.

The probe will populate this table for all network layer protocols in the protocol directory table whose value of protocolDirMatrixConfig is equal to supportedOn(3), and will delete any entries whose protocolDirEntry is deleted or has a protocolDirMatrixConfig value of supportedOff(2).

The probe will add to this table all pairs of addresses

seen in all packets with no MAC errors, and will increment

octet and packet counts in the table for all packets with no MAC errors.

        Further, this table will only contain entries that have a
        corresponding entry in the nlMatrixSDTable with the same
        source address and destination address."
    ::= { nlMatrix 3 }

nlMatrixDSEntry OBJECT-TYPE

    SYNTAX      NlMatrixDSEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the nlMatrixDSTable.

The hlMatrixControlIndex value in the index identifies the hlMatrixControlEntry on whose behalf this entry was created. The protocolDirLocalIndex value in the index identifies the network layer protocol of the nlMatrixDSSourceAddress and nlMatrixDSDestAddress.

        An example of the indexing of this table is
        nlMatrixDSPkts.1.783495.18.4.128.2.6.7.4.128.2.6.6"
    INDEX { hlMatrixControlIndex, nlMatrixDSTimeMark,
            protocolDirLocalIndex,
            nlMatrixDSDestAddress, nlMatrixDSSourceAddress }
    ::= { nlMatrixDSTable 1 }

NlMatrixDSEntry ::= SEQUENCE {
    nlMatrixDSTimeMark                 TimeFilter,
    nlMatrixDSSourceAddress            OCTET STRING,
    nlMatrixDSDestAddress              OCTET STRING,
    nlMatrixDSPkts                     ZeroBasedCounter32,
    nlMatrixDSOctets                   ZeroBasedCounter32,
    nlMatrixDSCreateTime               LastCreateTime
}

nlMatrixDSTimeMark OBJECT-TYPE

    SYNTAX      TimeFilter
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A TimeFilter for this entry.  See the TimeFilter textual
        convention to see how this works."
    ::= { nlMatrixDSEntry 1 }

nlMatrixDSSourceAddress OBJECT-TYPE

SYNTAX OCTET STRING

    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "The network source address for this nlMatrixDSEntry.

This is represented as an octet string with
specific semantics and length as identified
by the protocolDirLocalIndex component of the index.

        For example, if the protocolDirLocalIndex indicates an
        encapsulation of ip, this object is encoded as a length
        octet of 4, followed by the 4 octets of the ip address,
        in network byte order."
    ::= { nlMatrixDSEntry 2 }

nlMatrixDSDestAddress OBJECT-TYPE

    SYNTAX      OCTET STRING
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "The network destination address for this
        nlMatrixDSEntry.

This is represented as an octet string with
specific semantics and length as identified
by the protocolDirLocalIndex component of the index.

        For example, if the protocolDirLocalIndex indicates an
        encapsulation of ip, this object is encoded as a length
        octet of 4, followed by the 4 octets of the ip address,
        in network byte order."
    ::= { nlMatrixDSEntry 3 }

nlMatrixDSPkts OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of packets without errors transmitted from the
        source address to the destination address since this entry was
        added to the nlMatrixDSTable.  Note that this is the number of
        link-layer packets, so if a single network-layer packet is
        fragmented into several link-layer frames, this counter is
        incremented several times."
    ::= { nlMatrixDSEntry 4 }

nlMatrixDSOctets OBJECT-TYPE

SYNTAX ZeroBasedCounter32

    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of octets transmitted from the source address
        to the destination address since this entry was added to the
        nlMatrixDSTable (excluding framing bits but
        including FCS octets), excluding those octets in packets that
        contained errors.
    
        Note this doesn't count just those octets in the particular
        protocol frames, but includes the entire packet that contained
        the protocol."
    ::= { nlMatrixDSEntry 5 }

nlMatrixDSCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this entry was last activated.
        This can be used by the management station to ensure that the
        entry has not been deleted and recreated between polls."
    ::= { nlMatrixDSEntry 6 }

nlMatrixTopNControlTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF NlMatrixTopNControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A set of parameters that control the creation of a
        report of the top N matrix entries according to
        a selected metric."
    ::= { nlMatrix 4 }

nlMatrixTopNControlEntry OBJECT-TYPE

    SYNTAX      NlMatrixTopNControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the nlMatrixTopNControlTable.
    
        An example of the indexing of this table is
        nlMatrixTopNControlDuration.3"
    INDEX { nlMatrixTopNControlIndex }
    ::= { nlMatrixTopNControlTable 1 }

NlMatrixTopNControlEntry ::= SEQUENCE {

nlMatrixTopNControlIndex Integer32,

    nlMatrixTopNControlMatrixIndex      Integer32,
    nlMatrixTopNControlRateBase         INTEGER,
    nlMatrixTopNControlTimeRemaining    Integer32,
    nlMatrixTopNControlGeneratedReports Counter32,
    nlMatrixTopNControlDuration         Integer32,
    nlMatrixTopNControlRequestedSize    Integer32,
    nlMatrixTopNControlGrantedSize      Integer32,
    nlMatrixTopNControlStartTime        TimeStamp,
    nlMatrixTopNControlOwner            OwnerString,
    nlMatrixTopNControlStatus           RowStatus
}

nlMatrixTopNControlIndex OBJECT-TYPE

    SYNTAX     Integer32 (1..65535)
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "An index that uniquely identifies an entry
        in the nlMatrixTopNControlTable.  Each such
        entry defines one top N report prepared for
        one interface."
    ::= { nlMatrixTopNControlEntry 1 }

nlMatrixTopNControlMatrixIndex OBJECT-TYPE

    SYNTAX     Integer32 (1..65535)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The nlMatrix[SD/DS] table for which a top N report will be
        prepared on behalf of this entry.  The nlMatrix[SD/DS] table
        is identified by the value of the hlMatrixControlIndex
        for that table - that value is used here to identify the
        particular table.
    
        This object may not be modified if the associated
        nlMatrixTopNControlStatus object is equal to active(1)."
    ::= { nlMatrixTopNControlEntry 2 }

nlMatrixTopNControlRateBase OBJECT-TYPE

    SYNTAX      INTEGER {
                    nlMatrixTopNPkts(1),
                    nlMatrixTopNOctets(2)
                }
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The variable for each nlMatrix[SD/DS] entry that the
        nlMatrixTopNEntries are sorted by.
        This object may not be modified if the associated
        nlMatrixTopNControlStatus object is equal to active(1)."
    ::= { nlMatrixTopNControlEntry 3 }

nlMatrixTopNControlTimeRemaining OBJECT-TYPE

    SYNTAX     Integer32 (0..2147483647)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The number of seconds left in the report currently
        being collected.  When this object is modified by
        the management station, a new collection is started,
        possibly aborting a currently running report.  The
        new value is used as the requested duration of this
        report, and is immediately loaded into the associated
        nlMatrixTopNControlDuration object.
        When the report finishes, the probe will automatically
        start another collection with the same initial value
        of nlMatrixTopNControlTimeRemaining.  Thus the management
        station may simply read the resulting reports repeatedly,
        checking the startTime and duration each time to ensure that a
        report was not missed or that the report parameters were not
        changed.

While the value of this object is non-zero, it decrements by one per second until it reaches zero. At the time that this object decrements to zero, the report is made accessible in the nlMatrixTopNTable, overwriting any report that may be there.

When this object is modified by the management station, any

associated entries in the nlMatrixTopNTable shall be deleted.

        (Note that this is a different algorithm than the one used in
        the hostTopNTable)."
    DEFVAL { 1800 }
    ::= { nlMatrixTopNControlEntry 4 }

nlMatrixTopNControlGeneratedReports OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of reports that have been generated by this entry."
    ::= { nlMatrixTopNControlEntry 5 }

nlMatrixTopNControlDuration OBJECT-TYPE

SYNTAX Integer32

    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of seconds that this report has collected
        during the last sampling interval.
    
        When the associated nlMatrixTopNControlTimeRemaining object is
        set, this object shall be set by the probe to the
        same value and shall not be modified until the next
        time the nlMatrixTopNControlTimeRemaining is set.
        This value shall be zero if no reports have been
        requested for this nlMatrixTopNControlEntry."
    ::= { nlMatrixTopNControlEntry 6 }

nlMatrixTopNControlRequestedSize OBJECT-TYPE

    SYNTAX     Integer32 (0..2147483647)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The maximum number of matrix entries requested for this report.
    
        When this object is created or modified, the probe
        should set nlMatrixTopNControlGrantedSize as closely to this
        object as is possible for the particular probe
        implementation and available resources."
    DEFVAL { 150 }
    ::= { nlMatrixTopNControlEntry 7 }

nlMatrixTopNControlGrantedSize OBJECT-TYPE

    SYNTAX     Integer32 (0..2147483647)
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The maximum number of matrix entries in this report.

When the associated nlMatrixTopNControlRequestedSize object is created or modified, the probe should set this
object as closely to the requested value as is
possible for the particular implementation and available resources. The probe must not lower this value except as a result of a set to the associated nlMatrixTopNControlRequestedSize object.

If the value of nlMatrixTopNControlRateBase is equal to nlMatrixTopNPkts, when the next topN report is generated, matrix entries with the highest value of nlMatrixTopNPktRate shall be placed in this table in decreasing order of this rate until there is no more room or until there are no more matrix entries.

If the value of nlMatrixTopNControlRateBase is equal to nlMatrixTopNOctets, when the next topN report is generated, matrix entries with the highest value of nlMatrixTopNOctetRate shall be placed in this table in decreasing order of this rate until there is no more room or until there are no more matrix entries.

        It is an implementation-specific matter how entries with the
        same value of nlMatrixTopNPktRate or nlMatrixTopNOctetRate are
        sorted.  It is also an implementation-specific matter as to
        whether or not zero-valued entries are available."
    ::= { nlMatrixTopNControlEntry 8 }

nlMatrixTopNControlStartTime OBJECT-TYPE

    SYNTAX     TimeStamp
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this top N report was
        last started.  In other words, this is the time that
        the associated nlMatrixTopNControlTimeRemaining object was
        modified to start the requested report or the time
        the report was last automatically (re)started.
    
        This object may be used by the management station to
        determine if a report was missed or not."
    ::= { nlMatrixTopNControlEntry 9 }

nlMatrixTopNControlOwner OBJECT-TYPE

    SYNTAX     OwnerString
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The entity that configured this entry and is
        therefore using the resources assigned to it."
    ::= { nlMatrixTopNControlEntry 10 }

nlMatrixTopNControlStatus OBJECT-TYPE

    SYNTAX     RowStatus
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The status of this nlMatrixTopNControlEntry.

An entry may not exist in the active state unless all objects in the entry have an appropriate value.

        If this object is not equal to active(1), all
        associated entries in the nlMatrixTopNTable shall be deleted
        by the agent."
    ::= { nlMatrixTopNControlEntry 11 }

nlMatrixTopNTable OBJECT-TYPE

    SYNTAX     SEQUENCE OF NlMatrixTopNEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A set of statistics for those network layer matrix entries
        that have counted the highest number of octets or packets."
    ::= { nlMatrix 5 }

nlMatrixTopNEntry OBJECT-TYPE

    SYNTAX     NlMatrixTopNEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A conceptual row in the nlMatrixTopNTable.

The nlMatrixTopNControlIndex value in the index identifies the

nlMatrixTopNControlEntry on whose behalf this entry was

created.

        An example of the indexing of this table is
        nlMatrixTopNPktRate.3.10"
    INDEX { nlMatrixTopNControlIndex, nlMatrixTopNIndex }
    ::= { nlMatrixTopNTable 1 }

NlMatrixTopNEntry ::= SEQUENCE {
    nlMatrixTopNIndex                 Integer32,
    nlMatrixTopNProtocolDirLocalIndex Integer32,
    nlMatrixTopNSourceAddress         OCTET STRING,
    nlMatrixTopNDestAddress           OCTET STRING,
    nlMatrixTopNPktRate               Gauge32,
    nlMatrixTopNReversePktRate        Gauge32,
    nlMatrixTopNOctetRate             Gauge32,
    nlMatrixTopNReverseOctetRate      Gauge32
}

nlMatrixTopNIndex OBJECT-TYPE

    SYNTAX     Integer32 (1..65535)
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "An index that uniquely identifies an entry in
        the nlMatrixTopNTable among those in the same report.

This index is between 1 and N, where N is the
number of entries in this report.

If the value of nlMatrixTopNControlRateBase is equal to nlMatrixTopNPkts, increasing values of nlMatrixTopNIndex shall be assigned to entries with decreasing values of nlMatrixTopNPktRate until index N is assigned or there are no more nlMatrixTopNEntries.

        If the value of nlMatrixTopNControlRateBase is equal to
        nlMatrixTopNOctets, increasing values of nlMatrixTopNIndex
        shall be assigned to entries with decreasing values of
        nlMatrixTopNOctetRate until index N is assigned or there are
        no more nlMatrixTopNEntries."
    ::= { nlMatrixTopNEntry 1 }

nlMatrixTopNProtocolDirLocalIndex OBJECT-TYPE

    SYNTAX     Integer32 (1..2147483647)
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The protocolDirLocalIndex of the network layer protocol of
        this entry's network address."
    ::= { nlMatrixTopNEntry 2 }

nlMatrixTopNSourceAddress OBJECT-TYPE

    SYNTAX     OCTET STRING
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The network layer address of the source host in this
        conversation.

This is represented as an octet string with
specific semantics and length as identified
by the associated nlMatrixTopNProtocolDirLocalIndex.

        For example, if the protocolDirLocalIndex indicates an
        encapsulation of ip, this object is encoded as a length
        octet of 4, followed by the 4 octets of the ip address,
        in network byte order."
    ::= { nlMatrixTopNEntry 3 }

nlMatrixTopNDestAddress OBJECT-TYPE

    SYNTAX     OCTET STRING
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION

"The network layer address of the destination host in this conversation.

This is represented as an octet string with
specific semantics and length as identified
by the associated nlMatrixTopNProtocolDirLocalIndex.

        For example, if the nlMatrixTopNProtocolDirLocalIndex
        indicates an encapsulation of ip, this object is encoded as a
        length octet of 4, followed by the 4 octets of the ip address,
        in network byte order."
    ::= { nlMatrixTopNEntry 4 }

nlMatrixTopNPktRate OBJECT-TYPE

    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of packets seen from the source host
        to the destination host during this sampling interval, counted
        using the rules for counting the nlMatrixSDPkts object.
        If the value of nlMatrixTopNControlRateBase is
        nlMatrixTopNPkts, this variable will be used to sort this
        report."
    ::= { nlMatrixTopNEntry 5 }

nlMatrixTopNReversePktRate OBJECT-TYPE

    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of packets seen from the destination host to the
        source host during this sampling interval, counted
        using the rules for counting the nlMatrixSDPkts object (note
        that the corresponding nlMatrixSDPkts object selected is the
        one whose source address is equal to nlMatrixTopNDestAddress
        and whose destination address is equal to
        nlMatrixTopNSourceAddress.)
    
        Note that if the value of nlMatrixTopNControlRateBase is equal
        to nlMatrixTopNPkts, the sort of topN entries is based
        entirely on nlMatrixTopNPktRate, and not on the value of this
        object."
    ::= { nlMatrixTopNEntry 6 }

nlMatrixTopNOctetRate OBJECT-TYPE

    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of octets seen from the source host
        to the destination host during this sampling interval, counted
        using the rules for counting the nlMatrixSDOctets object.  If
        the value of nlMatrixTopNControlRateBase is
        nlMatrixTopNOctets, this variable will be used to sort this
        report."
    ::= { nlMatrixTopNEntry 7 }

nlMatrixTopNReverseOctetRate OBJECT-TYPE

    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of octets seen from the destination host to the
        source host during this sampling interval, counted
        using the rules for counting the nlMatrixDSOctets object (note
        that the corresponding nlMatrixSDOctets object selected is the
        one whose source address is equal to nlMatrixTopNDestAddress
        and whose destination address is equal to
        nlMatrixTopNSourceAddress.)
    
        Note that if the value of nlMatrixTopNControlRateBase is equal
        to nlMatrixTopNOctets, the sort of topN entries is based
        entirely on nlMatrixTopNOctetRate, and not on the value of
        this object."
    ::= { nlMatrixTopNEntry 8 }

-- Application Layer Functions
--
-- The application layer host, matrix, and matrixTopN functions report -- on protocol usage at the network layer or higher. Note that the -- use of the term application layer does not imply that only -- application-layer protocols are counted, rather it means that -- protocols up to and including the application layer are supported.

--
-- Application Layer Host Group
--
-- Counts the amount of traffic, by protocol, sent from and to each -- network address discovered by the probe.
-- Implementation of this group requires implementation of the Network -- Layer Host Group.

alHostTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF AlHostEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A collection of statistics for a particular protocol from a
        particular network address that has been discovered on an
        interface of this device.

The probe will populate this table for all protocols in the protocol directory table whose value of protocolDirHostConfig is equal to supportedOn(3), and will delete any entries whose protocolDirEntry is deleted or has a protocolDirHostConfig value of supportedOff(2).

        The probe will add to this table all addresses
        seen as the source or destination address in all packets with
        no MAC errors, and will increment octet and packet counts in
        the table for all packets with no MAC errors.  Further,
        entries will only be added to this table if their address
        exists in the nlHostTable and will be deleted from this table
        if their address is deleted from the nlHostTable."
    ::= { alHost 1 }

alHostEntry OBJECT-TYPE

    SYNTAX      AlHostEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the alHostTable.

The hlHostControlIndex value in the index identifies the hlHostControlEntry on whose behalf this entry was created. The first protocolDirLocalIndex value in the index identifies the network layer protocol of the address.
The nlHostAddress value in the index identifies the network layer address of this entry.
The second protocolDirLocalIndex value in the index identifies the protocol that is counted by this entry.

        An example of the indexing in this entry is
        alHostOutPkts.1.783495.18.4.128.2.6.6.34"
    INDEX { hlHostControlIndex, alHostTimeMark,
            protocolDirLocalIndex, nlHostAddress,
            protocolDirLocalIndex }
    ::= { alHostTable 1 }

AlHostEntry ::= SEQUENCE {

    alHostTimeMark                 TimeFilter,
    alHostInPkts                   ZeroBasedCounter32,
    alHostOutPkts                  ZeroBasedCounter32,

    alHostInOctets                 ZeroBasedCounter32,
    alHostOutOctets                ZeroBasedCounter32,
    alHostCreateTime               LastCreateTime
}

alHostTimeMark OBJECT-TYPE

    SYNTAX      TimeFilter
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A TimeFilter for this entry.  See the TimeFilter textual
        convention to see how this works."
    ::= { alHostEntry 1 }

alHostInPkts OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of packets of this protocol type without errors
        transmitted to this address since it was added to the
        alHostTable.  Note that this is the number of link-layer
        packets, so if a single network-layer packet is fragmented
        into several link-layer frames, this counter is incremented
        several times."
    ::= { alHostEntry 2 }

alHostOutPkts OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of packets of this protocol type without errors
        transmitted by this address since it was added to the
        alHostTable.  Note that this is the number of link-layer
        packets, so if a single network-layer packet is fragmented
        into several link-layer frames, this counter is incremented
        several times."
     ::= { alHostEntry 3 }

alHostInOctets OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of octets transmitted to this address
        of this protocol type since it was added to the
        alHostTable (excluding framing bits but including

FCS octets), excluding those octets in packets that contained errors.

        Note this doesn't count just those octets in the particular
        protocol frames, but includes the entire packet that contained
        the protocol."
    ::= { alHostEntry 4 }

alHostOutOctets OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of octets transmitted by this address
        of this protocol type since it was added to the
        alHostTable (excluding framing bits but including
        FCS octets), excluding those octets in packets that
        contained errors.
    
        Note this doesn't count just those octets in the particular
        protocol frames, but includes the entire packet that contained
        the protocol."
    ::= { alHostEntry 5 }

alHostCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this entry was last activated.
        This can be used by the management station to ensure that the
        entry has not been deleted and recreated between polls."
    ::= { alHostEntry 6 }

--
-- Application Layer Matrix Group
--
-- Counts the amount of traffic, by protocol, sent between each pair -- of network addresses discovered by the probe.
-- Implementation of this group requires implementation of the Network -- Layer Matrix Group.

alMatrixSDTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF AlMatrixSDEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A list of application traffic matrix entries which collect

statistics for conversations of a particular protocol between two network-level addresses. This table is indexed first by the source address and then by the destination address to make it convenient to collect all statistics from a particular address.

The probe will populate this table for all protocols in the protocol directory table whose value of protocolDirMatrixConfig is equal to supportedOn(3), and will delete any entries whose protocolDirEntry is deleted or has a protocolDirMatrixConfig value of supportedOff(2).

        The probe will add to this table all pairs of addresses for
        all protocols seen in all packets with no MAC errors, and will
        increment octet and packet counts in the table for all packets
        with no MAC errors.  Further, entries will only be added to
        this table if their address pair exists in the nlMatrixSDTable
        and will be deleted from this table if the address pair is
        deleted from the nlMatrixSDTable."
    ::= { alMatrix 1 }

alMatrixSDEntry OBJECT-TYPE

    SYNTAX      AlMatrixSDEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the alMatrixSDTable.

The hlMatrixControlIndex value in the index identifies the hlMatrixControlEntry on whose behalf this entry was created. The first protocolDirLocalIndex value in the index identifies the network layer protocol of the nlMatrixSDSourceAddress and nlMatrixSDDestAddress.
The nlMatrixSDSourceAddress value in the index identifies the network layer address of the source host in this conversation. The nlMatrixSDDestAddress value in the index identifies the network layer address of the destination host in this conversation.
The second protocolDirLocalIndex value in the index identifies the protocol that is counted by this entry.

        An example of the indexing of this entry is
        alMatrixSDPkts.1.783495.18.4.128.2.6.6.4.128.2.6.7.34"
    INDEX { hlMatrixControlIndex, alMatrixSDTimeMark,
            protocolDirLocalIndex,
            nlMatrixSDSourceAddress, nlMatrixSDDestAddress,
            protocolDirLocalIndex }
    ::= { alMatrixSDTable 1 }

AlMatrixSDEntry ::= SEQUENCE {
    alMatrixSDTimeMark                 TimeFilter,
    alMatrixSDPkts                     ZeroBasedCounter32,
    alMatrixSDOctets                   ZeroBasedCounter32,
    alMatrixSDCreateTime               LastCreateTime
}

alMatrixSDTimeMark OBJECT-TYPE

    SYNTAX      TimeFilter
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A TimeFilter for this entry.  See the TimeFilter textual
        convention to see how this works."
    ::= { alMatrixSDEntry 1 }

alMatrixSDPkts OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of packets of this protocol type without errors
        transmitted from the source address to the destination address
        since this entry was added to the alMatrixSDTable.  Note that
        this is the number of link-layer packets, so if a single
        network-layer packet is fragmented into several link-layer
        frames, this counter is incremented several times."
    ::= { alMatrixSDEntry 2 }

alMatrixSDOctets OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of octets in packets of this protocol type
        transmitted from the source address to the destination address
        since this entry was added to the alMatrixSDTable (excluding
        framing bits but including FCS octets), excluding those octets
        in packets that contained errors.
    
        Note this doesn't count just those octets in the particular
        protocol frames, but includes the entire packet that contained
        the protocol."
    ::= { alMatrixSDEntry 3 }

alMatrixSDCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this entry was last activated.
        This can be used by the management station to ensure that the
        entry has not been deleted and recreated between polls."
    ::= { alMatrixSDEntry 4 }

-- Traffic matrix tables from destination to source

alMatrixDSTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF AlMatrixDSEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A list of application traffic matrix entries which collect
        statistics for conversations of a particular protocol between
        two network-level addresses.  This table is indexed first by
        the destination address and then by the source address to make
        it convenient to collect all statistics to a particular
        address.

The probe will populate this table for all protocols in the protocol directory table whose value of protocolDirMatrixConfig is equal to supportedOn(3), and will delete any entries whose protocolDirEntry is deleted or has a protocolDirMatrixConfig value of supportedOff(2).

        The probe will add to this table all pairs of addresses for
        all protocols seen in all packets with no MAC errors, and will
        increment octet and packet counts in the table for all packets
        with no MAC errors.  Further, entries will only be added to
        this table if their address pair exists in the nlMatrixDSTable
        and will be deleted from this table if the address pair is
        deleted from the nlMatrixDSTable."
    ::= { alMatrix 2 }

alMatrixDSEntry OBJECT-TYPE

    SYNTAX      AlMatrixDSEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the alMatrixDSTable.

The hlMatrixControlIndex value in the index identifies the hlMatrixControlEntry on whose behalf this entry was created. The first protocolDirLocalIndex value in the index identifies the network layer protocol of the alMatrixDSSourceAddress and alMatrixDSDestAddress.

The nlMatrixDSDestAddress value in the index identifies the network layer address of the destination host in this conversation.
The nlMatrixDSSourceAddress value in the index identifies the network layer address of the source host in this conversation. The second protocolDirLocalIndex value in the index identifies the protocol that is counted by this entry.

        An example of the indexing of this entry is
        alMatrixDSPkts.1.783495.18.4.128.2.6.7.4.128.2.6.6.34"
    INDEX { hlMatrixControlIndex, alMatrixDSTimeMark,
            protocolDirLocalIndex,
            nlMatrixDSDestAddress, nlMatrixDSSourceAddress,
            protocolDirLocalIndex }
    ::= { alMatrixDSTable 1 }

AlMatrixDSEntry ::= SEQUENCE {
    alMatrixDSTimeMark                 TimeFilter,
    alMatrixDSPkts                     ZeroBasedCounter32,
    alMatrixDSOctets                   ZeroBasedCounter32,
    alMatrixDSCreateTime               LastCreateTime
}

alMatrixDSTimeMark OBJECT-TYPE

    SYNTAX      TimeFilter
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A TimeFilter for this entry.  See the TimeFilter textual
        convention to see how this works."
    ::= { alMatrixDSEntry 1 }

alMatrixDSPkts OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of packets of this protocol type without errors
        transmitted from the source address to the destination address
        since this entry was added to the alMatrixDSTable.  Note that
        this is the number of link-layer packets, so if a single
        network-layer packet is fragmented into several link-layer
        frames, this counter is incremented several times."
    ::= { alMatrixDSEntry 2 }

alMatrixDSOctets OBJECT-TYPE

    SYNTAX      ZeroBasedCounter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of octets in packets of this protocol type
        transmitted from the source address to the destination address
        since this entry was added to the alMatrixDSTable (excluding
        framing bits but including FCS octets), excluding those octets
        in packets that contained errors.
    
        Note this doesn't count just those octets in the particular
        protocol frames, but includes the entire packet that contained
        the protocol."
    ::= { alMatrixDSEntry 3 }

alMatrixDSCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this entry was last activated.
        This can be used by the management station to ensure that the
        entry has not been deleted and recreated between polls."
    ::= { alMatrixDSEntry 4 }

alMatrixTopNControlTable OBJECT-TYPE

    SYNTAX      SEQUENCE OF AlMatrixTopNControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A set of parameters that control the creation of a
        report of the top N matrix entries according to
        a selected metric."
    ::= { alMatrix 3 }

alMatrixTopNControlEntry OBJECT-TYPE

    SYNTAX      AlMatrixTopNControlEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A conceptual row in the alMatrixTopNControlTable.
    
        An example of the indexing of this table is
        alMatrixTopNControlDuration.3"
    INDEX { alMatrixTopNControlIndex }
    ::= { alMatrixTopNControlTable 1 }

AlMatrixTopNControlEntry ::= SEQUENCE {

    alMatrixTopNControlIndex            Integer32,
    alMatrixTopNControlMatrixIndex      Integer32,

    alMatrixTopNControlRateBase         INTEGER,
    alMatrixTopNControlTimeRemaining    Integer32,
    alMatrixTopNControlGeneratedReports Counter32,
    alMatrixTopNControlDuration         Integer32,
    alMatrixTopNControlRequestedSize    Integer32,
    alMatrixTopNControlGrantedSize      Integer32,
    alMatrixTopNControlStartTime        TimeStamp,
    alMatrixTopNControlOwner            OwnerString,
    alMatrixTopNControlStatus           RowStatus
}

alMatrixTopNControlIndex OBJECT-TYPE

    SYNTAX     Integer32 (1..65535)
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "An index that uniquely identifies an entry
        in the alMatrixTopNControlTable.  Each such
        entry defines one top N report prepared for
        one interface."
    ::= { alMatrixTopNControlEntry 1 }

alMatrixTopNControlMatrixIndex OBJECT-TYPE

    SYNTAX     Integer32 (1..65535)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The alMatrix[SD/DS] table for which a top N report will be
        prepared on behalf of this entry.  The alMatrix[SD/DS] table
        is identified by the value of the hlMatrixControlIndex
        for that table - that value is used here to identify the
        particular table.
    
        This object may not be modified if the associated
        alMatrixTopNControlStatus object is equal to active(1)."
    ::= { alMatrixTopNControlEntry 2 }

alMatrixTopNControlRateBase OBJECT-TYPE

    SYNTAX     INTEGER {
                  alMatrixTopNTerminalsPkts(1),
                  alMatrixTopNTerminalsOctets(2),
                  alMatrixTopNAllPkts(3),
                  alMatrixTopNAllOctets(4)
               }
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The variable for each alMatrix[SD/DS] entry that the

alMatrixTopNEntries are sorted by, as well as the
selector of the view of the matrix table that will be
used.

The values alMatrixTopNTerminalsPkts and alMatrixTopNTerminalsOctets cause collection only from protocols that have no child protocols that are counted. The values alMatrixTopNAllPkts and alMatrixTopNAllOctets cause collection from all alMatrix entries.

        This object may not be modified if the associated
        alMatrixTopNControlStatus object is equal to active(1)."
    ::= { alMatrixTopNControlEntry 3 }

alMatrixTopNControlTimeRemaining OBJECT-TYPE

    SYNTAX     Integer32 (0..2147483647)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The number of seconds left in the report currently
        being collected.  When this object is modified by
        the management station, a new collection is started,
        possibly aborting a currently running report.  The
        new value is used as the requested duration of this
        report, and is immediately loaded into the associated
        alMatrixTopNControlDuration object.
        When the report finishes, the probe will automatically
        start another collection with the same initial value
        of alMatrixTopNControlTimeRemaining.  Thus the management
        station may simply read the resulting reports repeatedly,
        checking the startTime and duration each time to ensure that a
        report was not missed or that the report parameters were not
        changed.

While the value of this object is non-zero, it decrements by one per second until it reaches zero. At the time that this object decrements to zero, the report is made accessible in the alMatrixTopNTable, overwriting any report that may be there.

When this object is modified by the management station, any

associated entries in the alMatrixTopNTable shall be deleted.

        (Note that this is a different algorithm than the one used in
        the hostTopNTable)."
    DEFVAL { 1800 }
    ::= { alMatrixTopNControlEntry 4 }

alMatrixTopNControlGeneratedReports OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of reports that have been generated by this entry."
    ::= { alMatrixTopNControlEntry 5 }

alMatrixTopNControlDuration OBJECT-TYPE

    SYNTAX     Integer32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of seconds that this report has collected
        during the last sampling interval.

When the associated alMatrixTopNControlTimeRemaining object is set, this object shall be set by the probe to the same value and shall not be modified until the next
time the alMatrixTopNControlTimeRemaining is set.

        This value shall be zero if no reports have been
        requested for this alMatrixTopNControlEntry."
    ::= { alMatrixTopNControlEntry 6 }

alMatrixTopNControlRequestedSize OBJECT-TYPE

    SYNTAX     Integer32 (0..2147483647)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The maximum number of matrix entries requested for this report.
    
        When this object is created or modified, the probe
        should set alMatrixTopNControlGrantedSize as closely to this
        object as is possible for the particular probe
        implementation and available resources."
    DEFVAL { 150 }
    ::= { alMatrixTopNControlEntry 7 }

alMatrixTopNControlGrantedSize OBJECT-TYPE

    SYNTAX     Integer32 (0..2147483647)
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The maximum number of matrix entries in this report.

When the associated alMatrixTopNControlRequestedSize object is created or modified, the probe should set this
object as closely to the requested value as is
possible for the particular implementation and available resources. The probe must not lower this value except as a result of a set to the associated alMatrixTopNControlRequestedSize object.

If the value of alMatrixTopNControlRateBase is equal to alMatrixTopNTerminalsPkts or alMatrixTopNAllPkts, when the next topN report is generated, matrix entries with the highest value of alMatrixTopNPktRate shall be placed in this table in decreasing order of this rate until there is no more room or until there are no more matrix entries.

If the value of alMatrixTopNControlRateBase is equal to alMatrixTopNTerminalsOctets or alMatrixTopNAllOctets, when the next topN report is generated, matrix entries with the highest value of alMatrixTopNOctetRate shall be placed in this table in decreasing order of this rate until there is no more room or until there are no more matrix entries.

        It is an implementation-specific matter how entries with the
        same value of alMatrixTopNPktRate or alMatrixTopNOctetRate are
        sorted.  It is also an implementation-specific matter as to
        whether or not zero-valued entries are available."
    ::= { alMatrixTopNControlEntry 8 }

alMatrixTopNControlStartTime OBJECT-TYPE

    SYNTAX     TimeStamp
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this top N report was
        last started.  In other words, this is the time that
        the associated alMatrixTopNControlTimeRemaining object
        was modified to start the requested report or the time
        the report was last automatically (re)started.
    
        This object may be used by the management station to
        determine if a report was missed or not."
    ::= { alMatrixTopNControlEntry 9 }

alMatrixTopNControlOwner OBJECT-TYPE

    SYNTAX     OwnerString
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The entity that configured this entry and is
        therefore using the resources assigned to it."
    
    ::= { alMatrixTopNControlEntry 10 }

alMatrixTopNControlStatus OBJECT-TYPE

    SYNTAX     RowStatus
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The status of this alMatrixTopNControlEntry.

An entry may not exist in the active state unless all objects in the entry have an appropriate value.

        If this object is not equal to active(1), all
        associated entries in the alMatrixTopNTable shall be
        deleted by the agent."
    ::= { alMatrixTopNControlEntry 11 }

alMatrixTopNTable OBJECT-TYPE

    SYNTAX     SEQUENCE OF AlMatrixTopNEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A set of statistics for those application layer matrix
        entries that have counted the highest number of octets or
        packets."
    ::= { alMatrix 4 }

alMatrixTopNEntry OBJECT-TYPE

    SYNTAX     AlMatrixTopNEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A conceptual row in the alMatrixTopNTable.

The alMatrixTopNControlIndex value in the index identifies

the alMatrixTopNControlEntry on whose behalf this entry was

created.

        An example of the indexing of this table is
        alMatrixTopNPktRate.3.10"
    INDEX { alMatrixTopNControlIndex, alMatrixTopNIndex }
    ::= { alMatrixTopNTable 1 }

AlMatrixTopNEntry ::= SEQUENCE {

    alMatrixTopNIndex                      Integer32,
    alMatrixTopNProtocolDirLocalIndex      Integer32,
    alMatrixTopNSourceAddress              OCTET STRING,
    alMatrixTopNDestAddress                OCTET STRING,
  
    alMatrixTopNAppProtocolDirLocalIndex   Integer32,
    alMatrixTopNPktRate                    Gauge32,
    alMatrixTopNReversePktRate             Gauge32,
    alMatrixTopNOctetRate                  Gauge32,
    alMatrixTopNReverseOctetRate           Gauge32
  }

alMatrixTopNIndex OBJECT-TYPE

    SYNTAX     Integer32 (1..65535)
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "An index that uniquely identifies an entry in
        the alMatrixTopNTable among those in the same report.
        This index is between 1 and N, where N is the
        number of entries in this report.

If the value of alMatrixTopNControlRateBase is equal to alMatrixTopNTerminalsPkts or alMatrixTopNAllPkts, increasing values of alMatrixTopNIndex shall be assigned to entries with decreasing values of alMatrixTopNPktRate until index N is assigned or there are no more alMatrixTopNEntries.

        If the value of alMatrixTopNControlRateBase is equal to
        alMatrixTopNTerminalsOctets or alMatrixTopNAllOctets,
        increasing values of alMatrixTopNIndex shall be assigned to
        entries with decreasing values of alMatrixTopNOctetRate until
        index N is assigned or there are no more alMatrixTopNEntries."
    ::= { alMatrixTopNEntry 1 }

alMatrixTopNProtocolDirLocalIndex OBJECT-TYPE

    SYNTAX     Integer32 (1..2147483647)
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The protocolDirLocalIndex of the network layer protocol of
        this entry's network address."
    ::= { alMatrixTopNEntry 2 }

alMatrixTopNSourceAddress OBJECT-TYPE

    SYNTAX     OCTET STRING
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The network layer address of the source host in this
        conversation.
        This is represented as an octet string with
        specific semantics and length as identified

by the associated alMatrixTopNProtocolDirLocalIndex.

        For example, if the alMatrixTopNProtocolDirLocalIndex
        indicates an encapsulation of ip, this object is encoded as a
        length octet of 4, followed by the 4 octets of the ip address,
        in network byte order."
    ::= { alMatrixTopNEntry 3 }

alMatrixTopNDestAddress OBJECT-TYPE

    SYNTAX     OCTET STRING
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The network layer address of the destination host in this
        conversation.

This is represented as an octet string with
specific semantics and length as identified
by the associated alMatrixTopNProtocolDirLocalIndex.

        For example, if the alMatrixTopNProtocolDirLocalIndex
        indicates an encapsulation of ip, this object is encoded as a
        length octet of 4, followed by the 4 octets of the ip address,
        in network byte order."
    ::= { alMatrixTopNEntry 4 }

alMatrixTopNAppProtocolDirLocalIndex OBJECT-TYPE

    SYNTAX     Integer32 (1..2147483647)
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The type of the protocol counted by this matrix entry."
    ::= { alMatrixTopNEntry 5 }

alMatrixTopNPktRate OBJECT-TYPE

    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of packets seen of this protocol from the source
        host to the destination host during this sampling interval,
        counted using the rules for counting the alMatrixSDPkts
        object.
    
        If the value of alMatrixTopNControlRateBase is
        alMatrixTopNTerminalsPkts or alMatrixTopNAllPkts, this
        variable will be used to sort this report."
    ::= { alMatrixTopNEntry 6 }

alMatrixTopNReversePktRate OBJECT-TYPE

    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of packets seen of this protocol from the
        destination host to the source host during this sampling
        interval, counted using the rules for counting the
        alMatrixDSPkts object  (note that the corresponding
        alMatrixSDPkts object selected is the one whose source address
        is equal to alMatrixTopNDestAddress and whose destination
        address is equal to alMatrixTopNSourceAddress.)
    
        Note that if the value of alMatrixTopNControlRateBase is equal
        to alMatrixTopNTerminalsPkts or alMatrixTopNAllPkts, the sort
        of topN entries is based entirely on alMatrixTopNPktRate, and
        not on the value of this object."
    ::= { alMatrixTopNEntry 7 }

alMatrixTopNOctetRate OBJECT-TYPE

    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of octets seen of this protocol from the source
        host to the destination host during this sampling interval,
        counted using the rules for counting the alMatrixSDOctets
        object.
    
        If the value of alMatrixTopNControlRateBase is
        alMatrixTopNTerminalsOctets or alMatrixTopNAllOctets, this
        variable will be used to sort this report."
    ::= { alMatrixTopNEntry 8 }

alMatrixTopNReverseOctetRate OBJECT-TYPE

    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The number of octets seen of this protocol from the
        destination host to the source host during this sampling
        interval, counted using the rules for counting the
        alMatrixDSOctets object  (note that the corresponding
        alMatrixSDOctets object selected is the one whose source
        address is equal to alMatrixTopNDestAddress and whose
        destination address is equal to alMatrixTopNSourceAddress.)

Note that if the value of alMatrixTopNControlRateBase is equal

        to alMatrixTopNTerminalsOctets or alMatrixTopNAllOctets, the
        sort of topN entries is based entirely on
        alMatrixTopNOctetRate, and not on the value of this object."
    ::= { alMatrixTopNEntry 9 }

--
-- User History Collection Group (usrHistory)
--
-- The usrHistory group combines mechanisms seen in the alarm and -- history groups to provide user-specified history collection, -- utilizing two additional control tables and one additional data -- table. This function has traditionally been done by NMS -- applications, via periodic polling. The usrHistory group allows -- this task to be offloaded to an RMON probe.
--
-- Data (an ASN.1 INTEGER based object) is collected in the same -- manner as any history data table (e.g. etherHistoryTable) except -- that the user specifies the MIB instances to be collected. Objects -- are collected in bucket-groups, with the intent that all MIB -- instances in the same bucket-group are collected as atomically as -- possible by the RMON probe.
--
-- The usrHistoryControlTable is a one-dimensional read-create table. -- Each row configures a collection of user history buckets, much -- the same as a historyControlEntry, except that the creation of a -- row in this table will cause one or more associated instances in -- the usrHistoryObjectTable to be created. The user specifies the -- number of bucket elements (rows in the usrHistoryObjectTable) -- requested, as well as the number of buckets requested.
--
-- The usrHistoryObjectTable is a 2-d read-write table.
-- Each row configures a single MIB instance to be collected.
-- All rows with the same major index constitute a bucket-group.
--
-- The usrHistoryTable is a 3-d read-only table containing
-- the data of associated usrHistoryControlEntries. Each
-- entry represents the value of a single MIB instance
-- during a specific sampling interval (or the rate of
-- change during the interval).
--
-- A sample value is stored in two objects - an absolute value and -- a status object. This allows numbers from -(2G-1) to +4G to be -- stored. The status object also indicates whether a sample is -- valid. This allows data collection to continue if periodic -- retrieval of a particular instance fails for any reason.
--
-- Row Creation Order Relationships
--

-- The static nature of the usrHistoryObjectTable creates
-- some row creation/modification issues. The rows in this
-- table need to be set before the associated -- usrHistoryControlEntry can be activated.
--
-- Note that the usrHistoryObject entries associated with a -- particular usrHistoryControlEntry are not required to
-- be active before the control entry is activated. However,
-- the usrHistory data entries associated with an inactive -- usrHistoryObject entry will be inactive (i.e. -- usrHistoryValStatus == valueNotAvailable).
--

usrHistoryControlTable OBJECT-TYPE

    SYNTAX SEQUENCE OF UsrHistoryControlEntry
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
        "A list of data-collection configuration entries."
    ::= { usrHistory 1 }

usrHistoryControlEntry OBJECT-TYPE

SYNTAX UsrHistoryControlEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION

"A list of parameters that set up a group of user-defined MIB objects to be sampled periodically (called a bucket-group).

        For example, an instance of usrHistoryControlInterval
        might be named usrHistoryControlInterval.1"
    INDEX { usrHistoryControlIndex }
    ::= { usrHistoryControlTable 1 }

UsrHistoryControlEntry ::= SEQUENCE {
    usrHistoryControlIndex             Integer32,
    usrHistoryControlObjects           Integer32,
    usrHistoryControlBucketsRequested  Integer32,
    usrHistoryControlBucketsGranted    Integer32,
    usrHistoryControlInterval          Integer32,
    usrHistoryControlOwner             OwnerString,
    usrHistoryControlStatus            RowStatus
}

usrHistoryControlIndex OBJECT-TYPE

    SYNTAX Integer32 (1..65535)
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
        "An index that uniquely identifies an entry in the
        usrHistoryControlTable.  Each such entry defines a
        set of samples at a particular interval for a specified
        set of MIB instances available from the managed system."
    ::= { usrHistoryControlEntry 1 }

usrHistoryControlObjects OBJECT-TYPE

    SYNTAX Integer32 (1..65535)
    MAX-ACCESS read-create
    STATUS current
    DESCRIPTION
        "The number of MIB objects to be collected
        in the portion of usrHistoryTable associated with this
        usrHistoryControlEntry.
    
        This object may not be modified if the associated instance
        of usrHistoryControlStatus is equal to active(1)."
    ::= { usrHistoryControlEntry 2 }

usrHistoryControlBucketsRequested OBJECT-TYPE

    SYNTAX Integer32 (1..65535)
    MAX-ACCESS read-create
    STATUS current
    DESCRIPTION
        "The requested number of discrete time intervals
        over which data is to be saved in the part of the
        usrHistoryTable associated with this usrHistoryControlEntry.
    
        When this object is created or modified, the probe
        should set usrHistoryControlBucketsGranted as closely to
        this object as is possible for the particular probe
        implementation and available resources."
    DEFVAL { 50 }
    ::= { usrHistoryControlEntry 3 }

usrHistoryControlBucketsGranted OBJECT-TYPE

    SYNTAX Integer32 (1..65535)
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "The number of discrete sampling intervals
        over which data shall be saved in the part of
        the usrHistoryTable associated with this
        usrHistoryControlEntry.

When the associated usrHistoryControlBucketsRequested

        object is created or modified, the probe should set
        this object as closely to the requested value as is
        possible for the particular  probe implementation and
        available resources.  The probe must not lower this
        value except as a result of a modification to the associated
        usrHistoryControlBucketsRequested object.

The associated usrHistoryControlBucketsRequested object should be set before or at the same time as this object to allow the probe to accurately estimate the resources required for this usrHistoryControlEntry.

There will be times when the actual number of buckets associated with this entry is less than the value of this object. In this case, at the end of each sampling interval, a new bucket will be added to the usrHistoryTable.

When the number of buckets reaches the value of this object and a new bucket is to be added to the usrHistoryTable, the oldest bucket associated with this usrHistoryControlEntry shall be deleted by the agent so that the new bucket can be added.

When the value of this object changes to a value less than the current value, entries are deleted from the usrHistoryTable associated with this usrHistoryControlEntry. Enough of the oldest of these entries shall be deleted by the agent so that their number remains less than or equal to the new value of this object.

        When the value of this object changes to a value greater
        than the current value, the number of associated usrHistory
        entries may be allowed to grow."
    ::= { usrHistoryControlEntry 4 }

usrHistoryControlInterval OBJECT-TYPE

    SYNTAX Integer32 (1..2147483647)
    MAX-ACCESS read-create
    STATUS current
    DESCRIPTION
        "The interval in seconds over which the data is
        sampled for each bucket in the part of the usrHistory
        table associated with this usrHistoryControlEntry.

Because the counters in a bucket may overflow at their

maximum value with no indication, a prudent manager will

take into account the possibility of overflow in any of

the associated counters. It is important to consider the minimum time in which any counter could overflow on a particular media type and set the usrHistoryControlInterval object to a value less than this interval.

        This object may not be modified if the associated
        usrHistoryControlStatus object is equal to active(1)."
    DEFVAL { 1800 }
    ::= { usrHistoryControlEntry 5 }

usrHistoryControlOwner OBJECT-TYPE

    SYNTAX OwnerString
    MAX-ACCESS read-create
    STATUS current
    DESCRIPTION
        "The entity that configured this entry and is
        therefore using the resources assigned to it."
    ::= { usrHistoryControlEntry 6 }

usrHistoryControlStatus OBJECT-TYPE

SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION

"The status of this variable history control entry.

An entry may not exist in the active state unless all objects in the entry have an appropriate value.

        If this object is not equal to active(1), all associated
        entries in the usrHistoryTable shall be deleted."
    ::= { usrHistoryControlEntry 7 }

-- Object table

usrHistoryObjectTable OBJECT-TYPE

    SYNTAX SEQUENCE OF UsrHistoryObjectEntry
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
        "A list of data-collection configuration entries."
    ::= { usrHistory 2 }

usrHistoryObjectEntry OBJECT-TYPE

SYNTAX UsrHistoryObjectEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION

"A list of MIB instances to be sampled periodically.

Entries in this table are created when an associated usrHistoryControlObjects object is created.

The usrHistoryControlIndex value in the index is
that of the associated usrHistoryControlEntry.

        For example, an instance of usrHistoryObjectVariable might be
        usrHistoryObjectVariable.1.3"
    INDEX { usrHistoryControlIndex, usrHistoryObjectIndex }
    ::= { usrHistoryObjectTable 1 }

UsrHistoryObjectEntry ::= SEQUENCE {
    usrHistoryObjectIndex             Integer32,
    usrHistoryObjectVariable          OBJECT IDENTIFIER,
    usrHistoryObjectSampleType        INTEGER
}

usrHistoryObjectIndex OBJECT-TYPE

    SYNTAX Integer32 (1..65535)
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
        "An index used to uniquely identify an entry in the
        usrHistoryObject table.  Each such entry defines a
        MIB instance to be collected periodically."
    ::= { usrHistoryObjectEntry 1 }

usrHistoryObjectVariable OBJECT-TYPE

SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-create
STATUS current
DESCRIPTION

"The object identifier of the particular variable to be sampled.

Only variables that resolve to an ASN.1 primitive type of

Integer32 (Integer32, Counter, Gauge, or TimeTicks) may be

sampled.

Because SNMP access control is articulated entirely in terms of the contents of MIB views, no access control mechanism exists that can restrict the value of this object to identify only those objects that exist in a particular MIB view. Because there is thus no acceptable means of restricting the read access that could be obtained through the user history

mechanism, the probe must only grant write access to this

object in those views that have read access to all objects on

the probe.

During a set operation, if the supplied variable name is not

available in the selected MIB view, a badValue error must be

returned.

        This object may not be modified if the associated
        usrHistoryControlStatus object is equal to active(1)."
    ::= { usrHistoryObjectEntry 2 }

usrHistoryObjectSampleType OBJECT-TYPE

    SYNTAX INTEGER {
               absoluteValue(1),
               deltaValue(2)
           }
    MAX-ACCESS read-create
    STATUS current
    DESCRIPTION
        "The method of sampling the selected variable for storage in
        the usrHistoryTable.

If the value of this object is absoluteValue(1), the value of

the selected variable will be copied directly into the history

bucket.

If the value of this object is deltaValue(2), the value of the selected variable at the last sample will be subtracted from the current value, and the difference will be stored in the history bucket. If the associated usrHistoryObjectVariable instance could not be obtained at the previous sample interval, then a delta sample is not possible, and the value of the associated usrHistoryValStatus object for this interval will be valueNotAvailable(1).

        This object may not be modified if the associated
        usrHistoryControlStatus object is equal to active(1)."
    ::= { usrHistoryObjectEntry 3 }

-- data table

usrHistoryTable OBJECT-TYPE

SYNTAX SEQUENCE OF UsrHistoryEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION

"A list of user defined history entries."

    ::= { usrHistory 3 }

usrHistoryEntry OBJECT-TYPE

SYNTAX UsrHistoryEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION

"A historical sample of user-defined variables. This sample

is associated with the usrHistoryControlEntry which set up the

parameters for a regular collection of these samples.

The usrHistoryControlIndex value in the index identifies the

usrHistoryControlEntry on whose behalf this entry was created.

The usrHistoryObjectIndex value in the index identifies the

usrHistoryObjectEntry on whose behalf this entry was created.

        For example, an instance of usrHistoryAbsValue, which represents
        the 14th sample of a variable collected as specified by
        usrHistoryControlEntry.1 and usrHistoryObjectEntry.1.5,
        would be named usrHistoryAbsValue.1.14.5"
    INDEX { usrHistoryControlIndex, usrHistorySampleIndex,
            usrHistoryObjectIndex }
    ::= { usrHistoryTable 1 }

UsrHistoryEntry ::= SEQUENCE {
    usrHistorySampleIndex   Integer32,
    usrHistoryIntervalStart TimeStamp,
    usrHistoryIntervalEnd   TimeStamp,
    usrHistoryAbsValue      Gauge32,
    usrHistoryValStatus     INTEGER
}

usrHistorySampleIndex OBJECT-TYPE

    SYNTAX     Integer32 (1..2147483647)
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "An index that uniquely identifies the particular sample this
        entry represents among all samples associated with the same
        usrHistoryControlEntry. This index starts at 1 and increases
        by one as each new sample is taken."
    ::= { usrHistoryEntry 1 }

usrHistoryIntervalStart OBJECT-TYPE

SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current

DESCRIPTION

"The value of sysUpTime at the start of the interval over which this sample was measured. If the probe keeps track of the time of day, it should start the first sample of the history at a time such that when the next hour of the day begins, a sample is started at that instant.

        Note that following this rule may require the probe to delay
        collecting the first sample of the history, as each sample
        must be of the same interval. Also note that the sample which
        is currently being collected is not accessible in this table
        until the end of its interval."
    ::= { usrHistoryEntry 2 }

usrHistoryIntervalEnd OBJECT-TYPE

    SYNTAX TimeStamp
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "The value of sysUpTime at the end of the interval over which
        this sample was measured."
    ::= { usrHistoryEntry 3 }

usrHistoryAbsValue OBJECT-TYPE

SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION

"The absolute value (i.e. unsigned value) of the user-specified statistic during the last sampling period. The value during the current sampling period is not made available until the period is completed.

To obtain the true value for this sampling interval, the

associated instance of usrHistoryValStatus must be checked,

and usrHistoryAbsValue adjusted as necessary.

        If the MIB instance could not be accessed during the sampling
        interval, then this object will have a value of zero and the
        associated instance of usrHistoryValStatus will be set to
        'valueNotAvailable(1)'."
    ::= { usrHistoryEntry 4 }

usrHistoryValStatus OBJECT-TYPE

SYNTAX INTEGER {

valueNotAvailable(1),
valuePositive(2),

        valueNegative(3)
    }
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "This object indicates the validity and sign of the data in
        the associated instance of usrHistoryAbsValue.

If the MIB instance could not be accessed during the sampling

interval, then 'valueNotAvailable(1)' will be returned.

If the sample is valid and actual value of the sample is

greater than or equal to zero then 'valuePositive(2)' is

returned.

        If the sample is valid and the actual value of the sample is
        less than zero, 'valueNegative(3)' will be returned. The
        associated instance of usrHistoryAbsValue should be multiplied
        by -1 to obtain the true sample value."
    ::= { usrHistoryEntry 5 }

-- The Probe Configuration Group
--
-- This group controls the configuration of various operating -- parameters of the probe.

ControlString ::= TEXTUAL-CONVENTION

STATUS current
DESCRIPTION

"This data type is used to communicate with a modem or a serial data switch. A ControlString contains embedded commands to control how the device will interact with the remote device through the serial interface. Commands are represented as two character sequences beginning with
the `^' character.

The following commands are recognized by the device (note that command characters are case sensitive):

           ^s  Send string that follows which is terminated by the
               next command or the end of string.
           ^c  Delay for the number of seconds that follows.  Toss
               out any data received rather than storing it in a
               buffer for parsing.
           ^t  Set timeout to the value represented by the decimal
               digits that follow.  The default timeout is 20
               seconds. Note that this timeout may be overridden
               by a smaller serialTimeout configured for the
               associated serial interface (see serialConfigTable).
           ^w  Wait for the reply string that follows which is
               terminated by the next command or the end of string.
               Partial and case insensitive matching is applied, ie.
               if the reply string (any case combination) is found
               anywhere in the received string, then the a match is
               found.  If the current timeout elapses without a match,
               then the remaining control string is ignored.
           ^!  The ^ character.
           ^d  Delay the number of seconds specified by the decimal
               digits that follow.
           ^b  Send break for the number of milliseconds specified by
               the decimal digits that follow.  If no digits follow,
               break will be enforced for 250 milliseconds by default.

The following ASCII control characters may be inserted into the `^s' send string or the `^w' reply string:

           ^@    0x00
           ^A    0x01
            ..
           ^M    0x0D
            ..
           ^Z    0x1A
           ^[    0x1B
           ^    0x1C
           ^]    0x1D
           ^^    0x1E
           ^_    0x1F
    
        Binary data may also be inserted into the data stream.  The
        control sequence for each byte of binary data is ^0x##, where
        ## is the hexadecimal representation of the data byte.  Two
        ASCII characters (0-9, a-f, A-F) must follow the `^0x'
        control prefix.  For example, `^0x0D^0x0A' is interpreted as a
        carriage return followed by a line feed."
    SYNTAX DisplayString

probeCapabilities OBJECT-TYPE

SYNTAX BITS {

        etherStats(0),
        historyControl(1),
        etherHistory(2),
        alarm(3),
        hosts(4),
        hostTopN(5),
        matrix(6),
        filter(7),
        capture(8),
        event(9),
        tokenRingMLStats(10),
        tokenRingPStats(11),
        tokenRingMLHistory(12),
        tokenRingPHistory(13),
        ringStation(14),
        ringStationOrder(15),
        ringStationConfig(16),
        sourceRouting(17),
        protocolDirectory(18),
        protocolDistribution(19),
        addressMapping(20),
        nlHost(21),
        nlMatrix(22),
        alHost(23),
        alMatrix(24),
        usrHistory(25),
        probeConfig(26)
    }
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "An indication of the RMON MIB groups supported
        on at least one interface by this probe."
    ::= { probeConfig 1 }

probeSoftwareRev  OBJECT-TYPE
    SYNTAX     DisplayString (SIZE(0..15))
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The software revision of this device.  This string will have
        a zero length if the revision is unknown."
    ::= { probeConfig 2 }

probeHardwareRev  OBJECT-TYPE
    SYNTAX     DisplayString (SIZE(0..31))
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The hardware revision of this device.  This string will have
        a zero length if the revision is unknown."
    ::= { probeConfig 3 }

probeDateTime  OBJECT-TYPE
    SYNTAX     OCTET STRING (SIZE (0 | 8 | 11))
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
        "Probe's current date and time.

         field  octets  contents                  range
         -----  ------  --------                  -----
           1      1-2   year                      0..65536
           2       3    month                     1..12
           3       4    day                       1..31
           4       5    hour                      0..23
           5       6    minutes                   0..59
           6       7    seconds                   0..60
                         (use 60 for leap-second)
           7       8    deci-seconds              0..9
           8       9    direction from UTC        '+' / '-'
           9      10    hours from UTC            0..11
          10      11    minutes from UTC          0..59

For example, Tuesday May 26, 1992 at 1:30:15 PM
EDT would be displayed as:

                     1992-5-26,13:30:15.0,-4:0
    
         Note that if only local time is known, then
         timezone information (fields 8-10) is not
         present, and if no time information is known, the null
         string is returned."
    ::= { probeConfig 4 }

probeResetControl  OBJECT-TYPE
    SYNTAX     INTEGER {
                    running(1),
                    warmBoot(2),
                    coldBoot(3)
              }
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
        "Setting this object to warmBoot(2) causes the device to
        restart the application software with current configuration
        parameters saved in non-volatile memory.  Setting this
        object to coldBoot(3) causes the device to reinitialize
        configuration parameters in non-volatile memory to default
        values and restart the application software.  When the device
        is running normally, this variable has a value of
        running(1)."
    ::= { probeConfig 5 }

-- The following download objects do not restrict an implementation -- from implementing additional download mechanisms (controlled in an -- implementation-specific manner). Further, in the case where the RMON -- agent shares a processor with other types of systems, the -- implementation is not required to download those non-RMON functions -- with this mechanism.

probeDownloadFile  OBJECT-TYPE
    SYNTAX     DisplayString (SIZE(0..127))
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
        "The file name to be downloaded from the TFTP server when a
        download is next requested via this MIB.  This value is set to
        the zero length string when no file name has been specified."
    ::= { probeConfig 6 }

probeDownloadTFTPServer  OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
        "The IP address of the TFTP server that contains the boot
        image to load when a download is next requested via this MIB.
        This value is set to `0.0.0.0' when no IP address has been
        specified."
    ::= { probeConfig 7 }

probeDownloadAction  OBJECT-TYPE
    SYNTAX     INTEGER {
                  notDownloading(1),
                  downloadToPROM(2),
                  downloadToRAM(3)
               }
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
        "When this object is set to downloadToRAM(2) or
        downloadToPROM(3), the device will discontinue its
        normal operation and begin download of the image specified
        by probeDownloadFile from the server specified by
        probeDownloadTFTPServer using the TFTP protocol.  If
        downloadToRAM(2) is specified, the new image is copied
        to RAM only (the old image remains unaltered in the flash
        EPROM).  If downloadToPROM(3) is specified
        the new image is written to the flash EPROM
        memory after its checksum has been verified to be correct.
        When the download process is completed, the device will
        warm boot to restart the newly loaded application.
        When the device is not downloading, this object will have
        a value of notDownloading(1)."
    ::= { probeConfig 8 }

probeDownloadStatus  OBJECT-TYPE
    SYNTAX     INTEGER {
                    downloadSuccess(1),
                    downloadStatusUnknown(2),
                    downloadGeneralError(3),
                    downloadNoResponseFromServer(4),
                    downloadChecksumError(5),
                    downloadIncompatibleImage(6),
                    downloadTftpFileNotFound(7),
                    downloadTftpAccessViolation(8)
               }
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The status of the last download procedure, if any.  This
        object will have a value of downloadStatusUnknown(2) if no
        download process has been performed."
    ::= { probeConfig 9 }

serialConfigTable  OBJECT-TYPE
    SYNTAX     SEQUENCE OF SerialConfigEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A table of serial interface configuration entries.  This data
        will be stored in non-volatile memory and preserved across
        probe resets or power loss."
    ::= { probeConfig 10 }

serialConfigEntry  OBJECT-TYPE
    SYNTAX     SerialConfigEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A set of configuration parameters for a particular
        serial interface on this device. If the device has no serial
        interfaces, this table is empty.

        The index is composed of the ifIndex assigned to this serial
        line interface."
    INDEX  { ifIndex }
    ::= { serialConfigTable 1 }

SerialConfigEntry ::= SEQUENCE {
    serialMode                   INTEGER,
    serialProtocol               INTEGER,
    serialTimeout                Integer32 (1..65535),
    serialModemInitString        ControlString (SIZE (0..255)),
    serialModemHangUpString      ControlString (SIZE (0..255)),
    serialModemConnectResp       DisplayString (SIZE (0..255)),
    serialModemNoConnectResp     DisplayString (SIZE (0..255)),
    serialDialoutTimeout         Integer32 (1..65535),
    serialStatus                 RowStatus
}

serialMode  OBJECT-TYPE
    SYNTAX     INTEGER {
                   direct(1),
                   modem(2)
               }
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The type of incoming connection to expect on this serial
        interface."
    DEFVAL { direct }
    ::= { serialConfigEntry 1 }

serialProtocol  OBJECT-TYPE
    SYNTAX     INTEGER {
                   other(1),
                   slip(2),
                   ppp(3)
               }
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The type of data link encapsulation to be used on this
        serial interface."
    DEFVAL { slip }
    ::= { serialConfigEntry 2 }

serialTimeout  OBJECT-TYPE
    SYNTAX     Integer32 (1..65535)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "This timeout value is used when the Management Station has
        initiated the conversation over the serial link. This variable
        represents the number of seconds of inactivity allowed before
        terminating the connection on this serial interface. Use the
        serialDialoutTimeout in the case where the probe has initiated
        the connection for the purpose of sending a trap."
    DEFVAL { 300 }
    ::= { serialConfigEntry 3 }

serialModemInitString  OBJECT-TYPE
    SYNTAX     ControlString (SIZE (0..255))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "A control string which controls how a modem attached to this
        serial interface should be initialized.  The initialization
        is performed once during startup and again after each
        connection is terminated if the associated serialMode has the
        value of modem(2).

        A control string that is appropriate for a wide variety of
        modems is: '^s^MATE0Q0V1X4 S0=1 S2=43^M'."
    ::= { serialConfigEntry 4 }

serialModemHangUpString  OBJECT-TYPE
    SYNTAX     ControlString (SIZE (0..255))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "A control string which specifies how to disconnect a modem
         connection on this serial interface.  This object is only
         meaningful if the associated serialMode has the value
         of modem(2).
         A control string that is appropriate for a wide variety of
         modems is: '^d2^s+++^d2^sATH0^M^d2'."
    ::= { serialConfigEntry 5 }

serialModemConnectResp  OBJECT-TYPE
    SYNTAX     DisplayString (SIZE (0..255))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "An ASCII string containing substrings that describe the
        expected modem connection response code and associated bps
        rate.  The substrings are delimited by the first character
        in the string, for example:
           /CONNECT/300/CONNECT 1200/1200/CONNECT 2400/2400/
           CONNECT 4800/4800/CONNECT 9600/9600
        will be interpreted as:
            response code    bps rate
            CONNECT            300
            CONNECT 1200      1200
            CONNECT 2400      2400
            CONNECT 4800      4800
            CONNECT 9600      9600
        The agent will use the information in this string to adjust
        the bps rate of this serial interface once a modem connection
        is established.

        A value that is appropriate for a wide variety of modems is:
        '/CONNECT/300/CONNECT 1200/1200/CONNECT 2400/2400/
         CONNECT 4800/4800/CONNECT 9600/9600/CONNECT 14400/14400/
        CONNECT 19200/19200/CONNECT 38400/38400/'."
    ::= { serialConfigEntry 6 }

serialModemNoConnectResp  OBJECT-TYPE
    SYNTAX     DisplayString (SIZE (0..255))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "An ASCII string containing response codes that may be
        generated by a modem to report the reason why a connection
        attempt has failed.  The response codes are delimited by
        the first character in the string, for example:
           /NO CARRIER/BUSY/NO DIALTONE/NO ANSWER/ERROR/
        If one of these response codes is received via this serial
        interface while attempting to make a modem connection,
        the agent will issue the hang up command as specified by
        serialModemHangUpString.

        A value that is appropriate for a wide variety of modems is:
        '/NO CARRIER/BUSY/NO DIALTONE/NO ANSWER/ERROR/'."
    ::= { serialConfigEntry 7 }

serialDialoutTimeout  OBJECT-TYPE
    SYNTAX     Integer32 (1..65535)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "This timeout value is used when the probe initiates the
        serial connection with the intention of contacting a
        management station. This variable represents the number
        of seconds of inactivity allowed before terminating the
        connection on this serial interface."
    DEFVAL { 20 }
    ::= { serialConfigEntry 8 }

serialStatus  OBJECT-TYPE
    SYNTAX     RowStatus
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The status of this serialConfigEntry.

        An entry may not exist in the active state unless all
        objects in the entry have an appropriate value."
    ::= { serialConfigEntry 9 }

netConfigTable  OBJECT-TYPE
    SYNTAX     SEQUENCE OF NetConfigEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A table of netConfigEntries."
    ::= { probeConfig 11 }

netConfigEntry  OBJECT-TYPE
    SYNTAX     NetConfigEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A set of configuration parameters for a particular
        network interface on this device. If the device has no network
        interface, this table is empty.

        The index is composed of the ifIndex assigned to the
        corresponding interface."
    INDEX  { ifIndex }
    ::= { netConfigTable 1 }

NetConfigEntry ::= SEQUENCE {
    netConfigIPAddress         IpAddress,
    netConfigSubnetMask        IpAddress,
    netConfigStatus            RowStatus
}

netConfigIPAddress  OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The IP address of this Net interface.  The default value
        for this object is 0.0.0.0.  If either the netConfigIPAddress
        or netConfigSubnetMask are 0.0.0.0, then when the device
        boots, it may use BOOTP to try to figure out what these
        values should be. If BOOTP fails, before the device
        can talk on the network, this value must be configured
        (e.g., through a terminal attached to the device). If BOOTP is
        used, care should be taken to not send BOOTP broadcasts too
        frequently and to eventually send very infrequently if no
        replies are received."
    ::= { netConfigEntry 1 }

netConfigSubnetMask  OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The subnet mask of this Net interface.  The default value
        for this object is 0.0.0.0.  If either the netConfigIPAddress
        or netConfigSubnetMask are 0.0.0.0, then when the device
        boots, it may use BOOTP to try to figure out what these
        values should be. If BOOTP fails, before the device
        can talk on the network, this value must be configured
        (e.g., through a terminal attached to the device). If BOOTP is
        used, care should be taken to not send BOOTP broadcasts too
        frequently and to eventually send very infrequently if no
        replies are received."
    ::= { netConfigEntry 2 }

netConfigStatus  OBJECT-TYPE
    SYNTAX     RowStatus
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The status of this netConfigEntry.

        An entry may not exist in the active state unless all
        objects in the entry have an appropriate value."
    ::= { netConfigEntry 3 }

netDefaultGateway  OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The IP Address of the default gateway.  If this value is
        undefined or unknown, it shall have the value 0.0.0.0."
    ::= { probeConfig 12 }

-- Trap Destination Table
--
-- This table defines the destination addresses for traps generated -- from the device. This table maps a community to one or more trap -- destination entries.
--

-- The same trap will be sent to all destinations specified in the -- entries that have the same trapDestCommunity as the eventCommunity -- (as defined by RMON MIB). Information in this table will be stored -- in non-volatile memory. If the device has gone through a hard -- restart, this information will be reset to its default state.

trapDestTable  OBJECT-TYPE
    SYNTAX     SEQUENCE OF TrapDestEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A list of trap destination entries."
    ::= { probeConfig 13 }

trapDestEntry  OBJECT-TYPE
    SYNTAX     TrapDestEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "This entry includes a destination IP address to which to send
        traps for this community."
    INDEX { trapDestIndex }
    ::= { trapDestTable 1 }

TrapDestEntry ::= SEQUENCE {
    trapDestIndex               Integer32,
    trapDestCommunity           OCTET STRING,
    trapDestProtocol            INTEGER,
    trapDestAddress             OCTET STRING,
    trapDestOwner               OwnerString,
    trapDestStatus              RowStatus
}

trapDestIndex  OBJECT-TYPE
    SYNTAX     Integer32 (1..65535)
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A value that uniquely identifies this trapDestEntry."
    ::= { trapDestEntry 1 }

trapDestCommunity  OBJECT-TYPE
    SYNTAX     OCTET STRING (SIZE(0..127))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "A community to which this destination address belongs.
        This entry is associated with any eventEntries in the RMON

MIB whose value of eventCommunity is equal to the value of this object. Every time an associated event entry sends a trap due to an event, that trap will be sent to each address in the trapDestTable with a trapDestCommunity equal to eventCommunity.

        This object may not be modified if the associated
        trapDestStatus object is equal to active(1)."
    ::= { trapDestEntry 2 }

trapDestProtocol OBJECT-TYPE

    SYNTAX     INTEGER {
                    ip(1),
                    ipx(2)
                }
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The protocol with which to send this trap."
    ::= { trapDestEntry 3 }

trapDestAddress  OBJECT-TYPE
    SYNTAX     OCTET STRING
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The address to send traps on behalf of this entry.

If the associated trapDestProtocol object is equal to ip(1), the encoding of this object is the same as the snmpUDPAddress textual convention in [RFC1906]:

          -- for a SnmpUDPAddress of length 6:
          --
          -- octets   contents        encoding
          --  1-4     IP-address      network-byte order
          --  5-6     UDP-port        network-byte order

If the associated trapDestProtocol object is equal to ipx(2), the encoding of this object is the same as the snmpIPXAddress textual convention in [RFC1906]:

          -- for a SnmpIPXAddress of length 12:
          --
          -- octets   contents            encoding
          --  1-4     network-number      network-byte order
          --  5-10    physical-address    network-byte order
          -- 11-12    socket-number       network-byte order

This object may not be modified if the associated

        trapDestStatus object is equal to active(1)."
    ::= { trapDestEntry 4 }

trapDestOwner  OBJECT-TYPE
    SYNTAX     OwnerString
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The entity that configured this entry and is
        therefore using the resources assigned to it."
    ::= { trapDestEntry 5 }

trapDestStatus  OBJECT-TYPE
    SYNTAX     RowStatus
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The status of this trap destination entry.

        An entry may not exist in the active state unless all
        objects in the entry have an appropriate value."
    ::= { trapDestEntry 6 }

-- Serial Connection Table
--
-- The device may communicate with a management station using
-- SLIP. In order for the device to send traps via SLIP, it must -- be able to initiate a connection over the serial interface. The -- serialConnectionTable stores the parameters for such connection -- initiation.

serialConnectionTable  OBJECT-TYPE
    SYNTAX     SEQUENCE OF SerialConnectionEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A list of serialConnectionEntries."
    ::= { probeConfig 14 }

serialConnectionEntry  OBJECT-TYPE
    SYNTAX     SerialConnectionEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Configuration for a SLIP link over a serial line."
    INDEX { serialConnectIndex }
    ::= { serialConnectionTable 1 }

SerialConnectionEntry ::= SEQUENCE {
    serialConnectIndex                   Integer32,
    serialConnectDestIpAddress           IpAddress,
    serialConnectType                    INTEGER,
    serialConnectDialString              ControlString,
    serialConnectSwitchConnectSeq        ControlString,
    serialConnectSwitchDisconnectSeq     ControlString,
    serialConnectSwitchResetSeq          ControlString,
    serialConnectOwner                   OwnerString,
    serialConnectStatus                  RowStatus
}

serialConnectIndex  OBJECT-TYPE
    SYNTAX     Integer32 (1..65535)
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "A value that uniquely identifies this serialConnection
        entry."
    ::= { serialConnectionEntry 1 }

serialConnectDestIpAddress  OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The IP Address that can be reached at the other end of this
        serial connection.
        This object may not be modified if the associated
        serialConnectStatus object is equal to active(1)."
    ::= { serialConnectionEntry 2 }

serialConnectType  OBJECT-TYPE
    SYNTAX     INTEGER {
                    direct(1),
                    modem(2),
                    switch(3),
                    modemSwitch(4)
               }
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The type of outgoing connection to make.  If this object
        has the value direct(1), then a direct serial connection
        is assumed.  If this object has the value modem(2),
        then serialConnectDialString will be used to make a modem
        connection.  If this object has the value switch(3),

then serialConnectSwitchConnectSeq will be used to establish the connection over a serial data switch, and serialConnectSwitchDisconnectSeq will be used to terminate the connection. If this object has the value modem-switch(4), then a modem connection will be made first followed by the switch connection.

This object may not be modified if the associated serialConnectStatus object is equal to active(1)."

    DEFVAL { direct }
    ::= { serialConnectionEntry 3 }

serialConnectDialString  OBJECT-TYPE
    SYNTAX     ControlString (SIZE(0..255))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "A control string which specifies how to dial the phone
        number in order to establish a modem connection.  The
        string should include dialing prefix and suffix.  For
        example: ``^s^MATD9,888-1234^M'' will instruct the Probe
        to send a carriage return followed by the dialing prefix
        ``ATD'', the phone number ``9,888-1234'', and a carriage
        return as the dialing suffix.
        This object may not be modified if the associated
        serialConnectStatus object is equal to active(1)."
    ::= { serialConnectionEntry 4 }

serialConnectSwitchConnectSeq  OBJECT-TYPE
    SYNTAX     ControlString (SIZE(0..255))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "A control string which specifies how to establish a
        data switch connection.
        This object may not be modified if the associated
        serialConnectStatus object is equal to active(1)."
     ::= { serialConnectionEntry 5 }

serialConnectSwitchDisconnectSeq  OBJECT-TYPE
    SYNTAX     ControlString (SIZE(0..255))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "A control string which specifies how to terminate a
        data switch connection.
        This object may not be modified if the associated
        serialConnectStatus object is equal to active(1)."
    ::= { serialConnectionEntry 6 }

serialConnectSwitchResetSeq  OBJECT-TYPE
    SYNTAX     ControlString (SIZE(0..255))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "A control string which specifies how to reset a data
        switch in the event of a timeout.
        This object may not be modified if the associated
        serialConnectStatus object is equal to active(1)."
    ::= { serialConnectionEntry 7 }

serialConnectOwner  OBJECT-TYPE
    SYNTAX     OwnerString
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The entity that configured this entry and is
        therefore using the resources assigned to it."
    ::= { serialConnectionEntry 8 }

serialConnectStatus  OBJECT-TYPE
    SYNTAX     RowStatus
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "The status of this serialConnectionEntry.

If the manager attempts to set this object to active(1) when the serialConnectType is set to modem(2) or modem-switch(4) and the serialConnectDialString is a zero-length string or cannot be correctly parsed as a ConnectString, the set request will be rejected with badValue(3).

If the manager attempts to set this object to active(1) when the serialConnectType is set to switch(3) or modem-switch(4) and the serialConnectSwitchConnectSeq, the serialConnectSwitchDisconnectSeq, or the serialConnectSwitchResetSeq are zero-length strings or cannot be correctly parsed as ConnectStrings, the set request will be rejected with badValue(3).

        An entry may not exist in the active state unless all
        objects in the entry have an appropriate value."
    ::= { serialConnectionEntry 9 }

--
-- Extensions to the RMON 1 MIB for RMON 2 devices
--
-- These extensions include the standard LastCreateTime Textual -- Convention for all control tables, as well as an augmentation of -- the filter entry that provides variable-length offsets into -- packets.

-- Each of the following, except for filterDroppedFrames, is a -- read-only object which, if implemented, automatically appears when -- the RMON1 row it is associated with is created.

etherStats2Table  OBJECT-TYPE
    SYNTAX     SEQUENCE OF EtherStats2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    ::= { statistics 4 }

etherStats2Entry  OBJECT-TYPE
    SYNTAX     EtherStats2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    AUGMENTS { etherStatsEntry }
    ::= { etherStats2Table 1 }

EtherStats2Entry ::= SEQUENCE {
    etherStatsDroppedFrames     Counter32,
    etherStatsCreateTime        LastCreateTime
}

etherStatsDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this
        collection.

This count does not include packets that were not counted

because they had MAC-layer errors.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { etherStats2Entry 1 }

etherStatsCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this control entry was last
        activated. This can be used by the management station to
        ensure that the table has not been deleted and recreated
        between polls."
    ::= { etherStats2Entry 2 }

historyControl2Table  OBJECT-TYPE
    SYNTAX     SEQUENCE OF HistoryControl2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    ::= { history 5 }

historyControl2Entry  OBJECT-TYPE
    SYNTAX     HistoryControl2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    AUGMENTS { historyControlEntry }
    ::= { historyControl2Table 1 }

HistoryControl2Entry ::= SEQUENCE {
    historyControlDroppedFrames Counter32
}

historyControlDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this

collection.

This count does not include packets that were not counted because they had MAC-layer errors.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { historyControl2Entry 1 }

hostControl2Table  OBJECT-TYPE
    SYNTAX     SEQUENCE OF HostControl2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    ::= { hosts 4 }

hostControl2Entry  OBJECT-TYPE
    SYNTAX     HostControl2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    AUGMENTS { hostControlEntry }
    ::= { hostControl2Table 1 }

HostControl2Entry ::= SEQUENCE {
    hostControlDroppedFrames    Counter32,
    hostControlCreateTime       LastCreateTime
}

hostControlDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this
        collection.

This count does not include packets that were not counted because they had MAC-layer errors.

Note that, unlike the dropEvents counter, this number is the exact number of frames dropped."

    ::= { hostControl2Entry 1 }

hostControlCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this control entry was last
        activated. This can be used by the management station to
        ensure that the table has not been deleted and recreated
        between polls."
    ::= { hostControl2Entry 2 }

matrixControl2Table  OBJECT-TYPE
    SYNTAX     SEQUENCE OF MatrixControl2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    ::= { matrix 4 }

matrixControl2Entry  OBJECT-TYPE
    SYNTAX     MatrixControl2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    AUGMENTS { matrixControlEntry }
    ::= { matrixControl2Table 1 }

MatrixControl2Entry ::= SEQUENCE {
    matrixControlDroppedFrames  Counter32,
    matrixControlCreateTime     LastCreateTime
}

matrixControlDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this
        collection.

This count does not include packets that were not counted

because they had MAC-layer errors.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { matrixControl2Entry 1 }

matrixControlCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this control entry was last
        activated. This can be used by the management station to
        ensure that the table has not been deleted and recreated
        between polls."
    ::= { matrixControl2Entry 2 }

channel2Table  OBJECT-TYPE
    SYNTAX     SEQUENCE OF Channel2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    ::= { filter 3 }

channel2Entry  OBJECT-TYPE
    SYNTAX     Channel2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    AUGMENTS { channelEntry }
    ::= { channel2Table 1 }

Channel2Entry ::= SEQUENCE {
    channelDroppedFrames    Counter32,
    channelCreateTime       LastCreateTime
}

channelDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe

is out of some resources and decides to shed load from this collection.

This count does not include packets that were not counted because they had MAC-layer errors.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { channel2Entry 1 }

channelCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this control entry was last
        activated. This can be used by the management station to
        ensure that the table has not been deleted and recreated
        between polls."
    ::= { channel2Entry 2 }

tokenRingMLStats2Table  OBJECT-TYPE
    SYNTAX     SEQUENCE OF TokenRingMLStats2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    ::= { statistics 5 }

tokenRingMLStats2Entry  OBJECT-TYPE
    SYNTAX     TokenRingMLStats2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    AUGMENTS { tokenRingMLStatsEntry }
    ::= { tokenRingMLStats2Table 1 }

TokenRingMLStats2Entry ::= SEQUENCE {
    tokenRingMLStatsDroppedFrames       Counter32,
    tokenRingMLStatsCreateTime          LastCreateTime
}

tokenRingMLStatsDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION

"The total number of frames which were received by the probe

and therefore not accounted for in the *StatsDropEvents, but for which the probe chose not to count for this entry for whatever reason. Most often, this event occurs when the probe is out of some resources and decides to shed load from this collection.

This count does not include packets that were not counted because they had MAC-layer errors.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { tokenRingMLStats2Entry 1 }

tokenRingMLStatsCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this control entry was last activated.
        This can be used by the management station to ensure that the
        table has not been deleted and recreated between polls."
    ::= { tokenRingMLStats2Entry 2 }

tokenRingPStats2Table  OBJECT-TYPE
    SYNTAX     SEQUENCE OF TokenRingPStats2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    ::= { statistics 6 }

tokenRingPStats2Entry  OBJECT-TYPE
    SYNTAX     TokenRingPStats2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    AUGMENTS {  tokenRingPStatsEntry }
    ::= { tokenRingPStats2Table 1 }

TokenRingPStats2Entry ::= SEQUENCE {
    tokenRingPStatsDroppedFrames    Counter32,
    tokenRingPStatsCreateTime       LastCreateTime
}

tokenRingPStatsDroppedFrames OBJECT-TYPE

SYNTAX Counter32

    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this
        collection.

This count does not include packets that were not counted because they had MAC-layer errors.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { tokenRingPStats2Entry 1 }

tokenRingPStatsCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this control entry was last activated.
        This can be used by the management station to ensure that the
        table has not been deleted and recreated between polls."
    ::= { tokenRingPStats2Entry 2 }

ringStationControl2Table  OBJECT-TYPE
    SYNTAX     SEQUENCE OF RingStationControl2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    ::= { tokenRing 7 }

ringStationControl2Entry  OBJECT-TYPE
    SYNTAX     RingStationControl2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    AUGMENTS { ringStationControlEntry }
    ::= { ringStationControl2Table 1 }

RingStationControl2Entry ::= SEQUENCE {
    ringStationControlDroppedFrames Counter32,
    ringStationControlCreateTime    LastCreateTime
}

ringStationControlDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this
        collection.

This count does not include packets that were not counted because they had MAC-layer errors.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { ringStationControl2Entry 1 }

ringStationControlCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this control entry was last activated.
        This can be used by the management station to ensure that the
        table has not been deleted and recreated between polls."
    ::= { ringStationControl2Entry 2 }

sourceRoutingStats2Table  OBJECT-TYPE
    SYNTAX     SEQUENCE OF SourceRoutingStats2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    ::= { tokenRing 8 }

sourceRoutingStats2Entry  OBJECT-TYPE
    SYNTAX     SourceRoutingStats2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Contains the RMON-2 augmentations to RMON-1."
    AUGMENTS { sourceRoutingStatsEntry }
    ::= { sourceRoutingStats2Table 1 }

SourceRoutingStats2Entry ::= SEQUENCE {

sourceRoutingStatsDroppedFrames Counter32,

sourceRoutingStatsCreateTime LastCreateTime

}

sourceRoutingStatsDroppedFrames OBJECT-TYPE

    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
       "The total number of frames which were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        for which the probe chose not to count for this entry for
        whatever reason.  Most often, this event occurs when the probe
        is out of some resources and decides to shed load from this
        collection.

This count does not include packets that were not counted because they had MAC-layer errors.

        Note that, unlike the dropEvents counter, this number is the
        exact number of frames dropped."
    ::= { sourceRoutingStats2Entry 1 }

sourceRoutingStatsCreateTime OBJECT-TYPE

    SYNTAX     LastCreateTime
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
        "The value of sysUpTime when this control entry was last activated.
        This can be used by the management station to ensure that the
        table has not been deleted and recreated between polls."
    ::= { sourceRoutingStats2Entry 2 }

filter2Table OBJECT-TYPE

    SYNTAX     SEQUENCE OF Filter2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Provides a variable-length packet filter feature to the
        RMON-1 filter table."
    ::= { filter 4 }

filter2Entry OBJECT-TYPE

    SYNTAX     Filter2Entry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
        "Provides a variable-length packet filter feature to the
        RMON-1 filter table."
    
    AUGMENTS { filterEntry }
    ::= { filter2Table 1 }

Filter2Entry ::= SEQUENCE {
    filterProtocolDirDataLocalIndex     Integer32,
    filterProtocolDirLocalIndex         Integer32
}

filterProtocolDirDataLocalIndex OBJECT-TYPE

    SYNTAX     Integer32 (0..2147483647)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "When this object is set to a non-zero value, the filter that
        it is associated with performs the following operations on
        every packet:
    
        1) - If the packet doesn't match the protocol directory entry
             identified by this object, discard the packet and exit
             (i.e., discard the packet if it is not of the identified
             protocol).
        2) - If the associated filterProtocolDirLocalIndex is non-zero
             and the packet doesn't match the protocol directory
             entry identified by that object, discard the packet and
             exit
        3) - If the packet matches, perform the regular filter
             algorithm as if the beginning of this named protocol is
             the beginning of the packet, potentially applying the
             filterOffset value to move further into the packet."
    DEFVAL { 0 }
    ::= { filter2Entry 1 }

filterProtocolDirLocalIndex OBJECT-TYPE

    SYNTAX     Integer32 (0..2147483647)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
        "When this object is set to a non-zero value, the filter that
        it is associated with will discard the packet if the packet
        doesn't match this protocol directory entry."
    DEFVAL { 0 }
    ::= { filter2Entry 2 }

-- Conformance Macros

rmon2MIBCompliances OBJECT IDENTIFIER ::= { rmonConformance 1 }

rmon2MIBGroups OBJECT IDENTIFIER ::= { rmonConformance 2 }

rmon2MIBCompliance MODULE-COMPLIANCE

    STATUS  current
    DESCRIPTION
        "Describes the requirements for conformance to
        the RMON2 MIB"
    MODULE  -- this module
        MANDATORY-GROUPS { protocolDirectoryGroup,
                           protocolDistributionGroup,
                           addressMapGroup,
                           nlHostGroup,
                           nlMatrixGroup,
                           usrHistoryGroup,
                           probeInformationGroup }
    
        GROUP   rmon1EnhancementGroup
        DESCRIPTION
            "The rmon1EnhancementGroup is mandatory for systems which
            implement RMON [RFC1757]"
    ::= { rmon2MIBCompliances 1 }

rmon2MIBApplicationLayerCompliance MODULE-COMPLIANCE

    STATUS  current
    DESCRIPTION
        "Describes the requirements for conformance to
        the RMON2 MIB with Application Layer Enhancements."
    MODULE  -- this module
        MANDATORY-GROUPS { protocolDirectoryGroup,
                           protocolDistributionGroup,
                           addressMapGroup,
                           nlHostGroup,
                           nlMatrixGroup,
                           alHostGroup,
                           alMatrixGroup,
                           usrHistoryGroup,
                           probeInformationGroup }
    
        GROUP   rmon1EnhancementGroup
        DESCRIPTION
            "The rmon1EnhancementGroup is mandatory for systems which
            implement RMON [RFC1757]"
    ::= { rmon2MIBCompliances 2 }

protocolDirectoryGroup OBJECT-GROUP

OBJECTS { protocolDirLastChange,

protocolDirLocalIndex, protocolDirDescr,

protocolDirType, protocolDirAddressMapConfig,

protocolDirHostConfig, protocolDirMatrixConfig,

              protocolDirOwner, protocolDirStatus }
    STATUS  current
    DESCRIPTION
        "Lists the inventory of protocols the probe has the capability
        of monitoring and allows the addition, deletion, and
        configuration of entries in this list."
    ::= { rmon2MIBGroups 1 }

protocolDistributionGroup OBJECT-GROUP

    OBJECTS { protocolDistControlDataSource,
              protocolDistControlDroppedFrames,
              protocolDistControlCreateTime,
              protocolDistControlOwner, protocolDistControlStatus,
              protocolDistStatsPkts, protocolDistStatsOctets }
    STATUS  current
    DESCRIPTION
        "Collects the relative amounts of octets and packets for the
        different protocols detected on a network segment."
    ::= { rmon2MIBGroups 2 }

addressMapGroup OBJECT-GROUP

    OBJECTS { addressMapInserts, addressMapDeletes,
              addressMapMaxDesiredEntries,
              addressMapControlDataSource,
              addressMapControlDroppedFrames,
              addressMapControlOwner, addressMapControlStatus,
              addressMapPhysicalAddress,
              addressMapLastChange }
    STATUS  current
    DESCRIPTION
        "Lists MAC address to network address bindings discovered by
        the probe and what interface they were last seen on."
    ::= { rmon2MIBGroups 3 }

nlHostGroup OBJECT-GROUP

    OBJECTS { hlHostControlDataSource,
              hlHostControlNlDroppedFrames, hlHostControlNlInserts,
              hlHostControlNlDeletes,
              hlHostControlNlMaxDesiredEntries,
              hlHostControlAlDroppedFrames, hlHostControlAlInserts,
              hlHostControlAlDeletes,
              hlHostControlAlMaxDesiredEntries, hlHostControlOwner,
              hlHostControlStatus, nlHostInPkts, nlHostOutPkts,
              nlHostInOctets, nlHostOutOctets,
              nlHostOutMacNonUnicastPkts, nlHostCreateTime }
    STATUS  current
    DESCRIPTION
        "Counts the amount of traffic sent from and to each network
        address discovered by the probe. Note that while the
        hlHostControlTable also has objects that control an optional
        alHostTable, implementation of the alHostTable is not required
        to fully implement this group."
    ::= { rmon2MIBGroups 4 }

nlMatrixGroup OBJECT-GROUP

    OBJECTS { hlMatrixControlDataSource,
              hlMatrixControlNlDroppedFrames,
              hlMatrixControlNlInserts, hlMatrixControlNlDeletes,
              hlMatrixControlNlMaxDesiredEntries,
              hlMatrixControlAlDroppedFrames,
              hlMatrixControlAlInserts, hlMatrixControlAlDeletes,
              hlMatrixControlAlMaxDesiredEntries,
              hlMatrixControlOwner, hlMatrixControlStatus,
              nlMatrixSDPkts, nlMatrixSDOctets, nlMatrixSDCreateTime,
              nlMatrixDSPkts, nlMatrixDSOctets, nlMatrixDSCreateTime,
              nlMatrixTopNControlMatrixIndex,
              nlMatrixTopNControlRateBase,
              nlMatrixTopNControlTimeRemaining,
              nlMatrixTopNControlGeneratedReports,
              nlMatrixTopNControlDuration,
              nlMatrixTopNControlRequestedSize,
              nlMatrixTopNControlGrantedSize,
              nlMatrixTopNControlStartTime,
              nlMatrixTopNControlOwner, nlMatrixTopNControlStatus,
              nlMatrixTopNProtocolDirLocalIndex,
              nlMatrixTopNSourceAddress, nlMatrixTopNDestAddress,
              nlMatrixTopNPktRate, nlMatrixTopNReversePktRate,
              nlMatrixTopNOctetRate, nlMatrixTopNReverseOctetRate }
    STATUS  current
    DESCRIPTION
        "Counts the amount of traffic sent between each pair of
        network addresses discovered by the probe. Note that while the
        hlMatrixControlTable also has objects that control optional
        alMatrixTables, implementation of the alMatrixTables is not
        required to fully implement this group."
    ::= { rmon2MIBGroups 5 }

alHostGroup OBJECT-GROUP

    OBJECTS { alHostInPkts, alHostOutPkts,
              alHostInOctets, alHostOutOctets, alHostCreateTime }
    STATUS  current
    DESCRIPTION
        "Counts the amount of traffic, by protocol, sent from and to
        each network address discovered by the probe. Implementation
        of this group requires implementation of the Network Layer
        Host Group."
    ::= { rmon2MIBGroups 6 }

alMatrixGroup OBJECT-GROUP

    OBJECTS { alMatrixSDPkts, alMatrixSDOctets, alMatrixSDCreateTime,
              alMatrixDSPkts, alMatrixDSOctets, alMatrixDSCreateTime,
              alMatrixTopNControlMatrixIndex,
              alMatrixTopNControlRateBase,
              alMatrixTopNControlTimeRemaining,
              alMatrixTopNControlGeneratedReports,
              alMatrixTopNControlDuration,
              alMatrixTopNControlRequestedSize,
              alMatrixTopNControlGrantedSize,
              alMatrixTopNControlStartTime,
              alMatrixTopNControlOwner, alMatrixTopNControlStatus,
              alMatrixTopNProtocolDirLocalIndex,
              alMatrixTopNSourceAddress, alMatrixTopNDestAddress,
              alMatrixTopNAppProtocolDirLocalIndex,
              alMatrixTopNPktRate, alMatrixTopNReversePktRate,
              alMatrixTopNOctetRate, alMatrixTopNReverseOctetRate }
    STATUS  current
    DESCRIPTION
        "Counts the amount of traffic, by protocol, sent between each
        pair of network addresses discovered by the
        probe. Implementation of this group requires implementation of
        the Network Layer Matrix Group."
    ::= { rmon2MIBGroups 7 }

usrHistoryGroup OBJECT-GROUP

    OBJECTS { usrHistoryControlObjects,
              usrHistoryControlBucketsRequested,
              usrHistoryControlBucketsGranted,
              usrHistoryControlInterval,
              usrHistoryControlOwner, usrHistoryControlStatus,
              usrHistoryObjectVariable, usrHistoryObjectSampleType,
              usrHistoryIntervalStart, usrHistoryIntervalEnd,
              usrHistoryAbsValue, usrHistoryValStatus }
    STATUS  current
    DESCRIPTION
        "The usrHistoryGroup provides user-defined collection of
        historical information from MIB objects on the probe."
    ::= { rmon2MIBGroups 8 }

probeInformationGroup OBJECT-GROUP

    OBJECTS { probeCapabilities,
              probeSoftwareRev, probeHardwareRev, probeDateTime }
    STATUS  current
    DESCRIPTION
        "This group describes various operating parameters of the
        probe as well as controlling the local time of the probe."
    ::= { rmon2MIBGroups 9 }

probeConfigurationGroup OBJECT-GROUP

    OBJECTS { probeResetControl, probeDownloadFile,
              probeDownloadTFTPServer, probeDownloadAction,
              probeDownloadStatus,
              serialMode, serialProtocol, serialTimeout,
              serialModemInitString, serialModemHangUpString,
              serialModemConnectResp, serialModemNoConnectResp,
              serialDialoutTimeout, serialStatus,
              netConfigIPAddress, netConfigSubnetMask,
              netConfigStatus, netDefaultGateway,
              trapDestCommunity, trapDestProtocol, trapDestAddress,
              trapDestOwner, trapDestStatus,
              serialConnectDestIpAddress, serialConnectType,
              serialConnectDialString, serialConnectSwitchConnectSeq,
              serialConnectSwitchDisconnectSeq,
              serialConnectSwitchResetSeq,
              serialConnectOwner, serialConnectStatus }
    STATUS  current
    DESCRIPTION
        "This group controls the configuration of various operating
        parameters of the probe."
    ::= { rmon2MIBGroups 10 }

rmon1EnhancementGroup OBJECT-GROUP

    OBJECTS { historyControlDroppedFrames, hostControlDroppedFrames,
              hostControlCreateTime, matrixControlDroppedFrames,
              matrixControlCreateTime, channelDroppedFrames,
              channelCreateTime, filterProtocolDirDataLocalIndex,
              filterProtocolDirLocalIndex }
    STATUS  current
    DESCRIPTION
        "This group adds some enhancements to RMON-1 that help
        management stations."
    ::= { rmon2MIBGroups 11 }

rmon1EthernetEnhancementGroup OBJECT-GROUP

    OBJECTS { etherStatsDroppedFrames, etherStatsCreateTime }
    STATUS  current
    DESCRIPTION
        "This group adds some enhancements to RMON-1 that help
        management stations."
    ::= { rmon2MIBGroups 12 }

rmon1TokenRingEnhancementGroup OBJECT-GROUP

OBJECTS { tokenRingMLStatsDroppedFrames,

              tokenRingMLStatsCreateTime,
              tokenRingPStatsDroppedFrames, tokenRingPStatsCreateTime,
              ringStationControlDroppedFrames,
              ringStationControlCreateTime,
              sourceRoutingStatsDroppedFrames,
              sourceRoutingStatsCreateTime }
    STATUS  current
    DESCRIPTION
        "This group adds some enhancements to RMON-1 that help
        management stations."
    ::= { rmon2MIBGroups 13 }
END

7. Security Considerations

In order to implement this MIB, a probe must capture all packets on the locally-attached network, including packets between third parties. These packets are analyzed to collect network addresses, protocol usage information, and conversation statistics. Data of this nature may be considered sensitive in some environments. In such environments the administrator may wish to restrict SNMP access to the probe.

A probe implementing this MIB is likely to also implement RMON [RFC1757], which includes functions for returning the contents of captured packets, potentially including sensitive user data or passwords. It is recommended that SNMP access to these functions be restricted.

8. Appendix - TimeFilter Implementation Notes

1. Theory of Operation

The TimeFilter mechanism allows an NMS to reduce the number of SNMP transactions required for a 'table-update' operation. Polling of tables that incorporate a 'TimeFilter' INDEX can be reduced to a theoretical minimum (if used correctly). It can be easily implemented by an agent in a way independent of the number of NMS applications using the same time-filtered table.

Although the name 'TimeFilter' may imply that a history of change events is maintained by the agent, this is not the case. A time- filtered-value represents the current value of the object instance, not the 'saved' value at the time indicated by the TimeFilter INDEX value. Note that TimeFilter objects only appear in INDEX clauses (always not-accessible), so their value is never retrieved. By design, the actual value of a TimeFilter instance is not in itself meaningful (it's not a 'last-change-timestamp').

The TimeFilter is a boolean filtering function applied in internal Get* PDU processing. If the 'last-change-time' of the specified instance is less than the particular TimeFilter INDEX value, then the instance is considered 'not-present' (skipped for GetNext and GetBulk PDUs; 'noSuchInstance' or returned to the requester.

1.1) Agent Implementation of a Time-Filtered Table

In implementation, the time-filtered rows (one for each tick of sysUpTime) are only conceptual. The agent simply filters a real table based on:

* the current value of sysUpTime
* the TimeFilter value passed in the varbind
* the last-update timestamp of each requested counter

         (agent implementation requirement)

For example, to implement a time-filtered counter, an agent maintains a timestamp in a 32-bit storage location, initialized to zero. This is in addition to whatever instrumentation is needed for the counter.

Each time the counter is updated, the current value of sysUpTime is recorded in the associated timestamp. If this is not possible or practical, then a background polling process must 'refresh' the timestamp by sampling counter values and comparing them to recorded samples. The timestamp update must occur within 5 seconds of the actual change event.

When an agent receives a Get, GetNext, or GetBulk PDU requesting a time-filtered instance, the following agent has determined that the instance is within the MIB view indicated by the community string in the PDU.

       /* return TRUE if the object is present */
       boolean time_filter_test (
           TimeFilter  last_modified_timestamp,
           TimeFilter  index_value_in_pdu )
       {
           if (last_modified_timestamp < index_value_in_pdu)
            return FALSE;
           else
               return TRUE;
       }

The agent applies this function regardless of the lastActivationTime of the conceptual row in question. In other words, counter discontinuities are ignored (i.e. conceptual row deleted and then re-created later). An agent should consider a object instance 'changed' when it is created (either at restart time for scalars and static objects, or row-creation-time for dynamic tables).

Note that using a timeFilter INDEX value of zero removes the filtering functionality, as the instance will always be

1.2) NMS Implementation of a Time-Filtered Table

The particular TimeFilter INDEX values used by an NMS reflect the polling interval of the NMS, relative to the particular agent's notion of sysUpTime.

An NMS needs to maintain one timestamp variable per agent (initialized to zero) for an arbitrary group of time-filtered MIB objects that are gathered together in the same PDU. Each time the Get* PDU is sent, a request for sysUpTime is included. The retrieved sysUpTime value is used as the timeFilter value in the next polling cycle. If a polling sweep of a time-filtered group of objects requires more than one SNMP transaction, then the sysUpTime value retrieved in the first GetResponse PDU of the polling sweep is saved as the next timeFilter value.

The actual last-update time of a given object is not indicated in the returned GetResponse instance identifier, but rather the timeFilter value passed in the Get*Request PDU is returned.

   A "time-filtered get-next/bulk-sweep", done once per polling
   cycle, is a series of GetNext or GetBulk transactions, and is
   over when one of the following events occurs:
     1) the TimeFilter index value returned in the GetResponse is
        different than the TimeFilter index value passed in the
        GetNext or GetBulk request. Counter values will still be
        returned beyond this point (until the last-change-time is
        reached), but most likely the same values will be
   returned.
     2) the return PDU includes instances lexigraphically greater
        than the objects expected (i.e. same GetNext semantics as
        if the TimeFilter wasn't there)
     3) a noSuchName or other exception/error is returned.

Note that the use of a time-filtered table in combination with a GetRequest PDU neutralizes any optimization that otherwise might be achieved with the TimeFilter, because no PDU transactions are saved. Either the current time-filtered object-value is returned, or a 'noSuchInstance' exception (SNMPv1c) or 'noSuchName' error (SNMPv1) is returned.

   If GetBulk PDUs are used, then the value selected for response PDUs
   generated by the agent, since duplicate entries (one per size. An
appropriate of conceptual rows in the time-filtered table if known, or
   equal to the number of instances expected to fit in a GetResponse PDU
   without causing a 'tooBig' error from the agent.

2) TimeFilter Example

The following example demonstrates how an NMS and Agent might use a table with a TimeFilter object in the INDEX. A static table is assumed to keep the example simple, but dynamic tables can also be supported.

2.1) General Assumptions

   fooEntry INDEX { fooTimeMark, fooIfIndex }
   FooEntry = SEQUENCE {
       fooTimeMark    TimeFilter,
       fooIfIndex     Integer32,
       fooCounts      Counter32
   }

   The NMS polls the fooTable every 15 seconds and the
baseline
   poll occurs when the agent has been up for 6 seconds,
   and the NMS has been up for 10 seconds.
   There are 2 static rows in this table at system
initialization
   (fooCounts.0.1 and fooCounts.0.2).

   Row 1 was updated as follows:
       SysUpTime    fooCounts.*.1 value         500
1         900            2
          2300            3

Row 2 was updated as follows:

       SysUpTime    fooCounts.*.2 value
          1100            1
          1400            2

2.2) SNMP Transactions from NMS Perspective

   Time nms-1000:
       # NMS baseline poll -- get everything since last agent
restart
       # TimeFilter == 0

       get-bulk(nonRptrs=1, maxReps=2, sysUpTime.0,
            fooCounts.0);
       returns:
          sysUpTime.0 == 600
          fooCounts.0.1 == 1  # incremented at time 500
fooCounts.0.2 == 0  # visible since created at time 0

Time nms-2500:

# NMS 1st poll
# TimeFilter index == 600

       get-bulk(nonRptrs=1, maxReps=2, sysUpTime.0,
            fooCounts.600);
       returns:
          sysUpTime.0 == 2100
          fooCounts.600.1 == 2   # incremented at time 900
       fooCounts.600.2 == 2   # incremented at times 1100 and
1400
          fooCounts.601.1 == 2   # indicates end of sweep

Time nms-4000:

# NMS 2nd poll
# TimeFilter == 2100

       get-bulk(nonRptrs=1, maxReps=2, sysUpTime.0,
            fooCounts.2100);
       returns:
           sysUpTime.0 == 3600
           fooCounts.2100.1 == 3  # incremented at time 2300
           fooCounts.2102.1 == 3  # indicates end-of-sweep

# the counter value for row 2 is not returned because
# it hasn't changed since sysUpTime == 2100.
# The next timetick value for row 1 is returned instead

Time nms-5500:

# NMS 3rd poll
# TimeFilter == 3600

       get-bulk(nonRptrs=1, maxReps=2, sysUpTime.0,
             fooCounts.3600);
       returns:
           sysUpTime.0 == 5100
           some-instance-outside-the-fooTable == <don't care>
           some-instance-outside-the-fooTable == <don't care>

       # no 'fooTable' counter values at all are returned
because
       # neither counter has been updated since sysUpTime ==
3600

2.3) Transactions and TimeFilter Maintenance: Agent

Perspective

Time agt-0:

       # initialize fooTable
       fooCounts.1 = 0; changed.1 = 0;
       fooCounts.2 = 0; changed.2 = 0;

Time agt-500:

       # increment fooCounts.1
       ++fooCounts.1; changed.1 = 500;

Time agt-600

       # answer get-bulk
       #   get-bulk(nonRptrs=1, maxReps=2, sysUpTime.0,
       #       fooCounts.0);
       # (changed >= 0)
       # return both counters

Time agt-900:

       # increment fooCounts.1
       ++fooCounts.1; changed.1 = 900;

Time agt-1100:

       # increment fooCounts.2
       ++fooCounts.2; changed.2 = 1100;

Time agt-1400:

       # increment fooCounts.2
       ++fooCounts.2; changed.2 = 1400;

Time agt-2100

       # answer get-bulk
       # get-bulk(nonRptrs=1, maxReps=2, sysUpTime.0,
       #     fooCounts.600);
       # (changed >= 600)
       # return both counters

Time agt-2300:

       # increment fooCounts.1
       ++fooCounts.1; changed.1 = 2300;

Time agt-3600:

       # answer get-bulk
       # get-bulk(nonRptrs=1, maxReps=2, sysUpTime.0,
       #     fooCounts.2100);
       # (changed >= 2100)
       # return only fooCounts.1 from the fooTable--twice

Time agt-5100:

       # answer get-bulk
       # get-bulk(nonRptrs=1, maxReps=2, sysUpTime.0,
       #      fooCounts.3600);
       # (changed >= 3600)
       # return lexigraphically-next two MIB instances

9. Acknowledgments

This document was produced by the IETF Remote Network Monitoring Working Group.

10. References

[1]  SNMPv2 Working Group, J. Case, K. McCloghrie, M. Rose, S.
     Waldbusser, "Structure and Identification of Management
     Information for Version 2 of the Simple Network
     Management Protocol (SNMPv2)" RFC 1902, January 1996.

[2]  SNMPv2 Working Group, J. Case, K. McCloghrie, M. Rose, S.
     Waldbusser, "Textual Conventions for Version 2 of the
     Simple Network Management Protocol (SNMPv2)", RFC 1903
     January 1996.

[3]  McCloghrie, K., and M. Rose, "Management Information Base
     for Network Management of TCP/IP-based internets: MIB-II",
     STD 17, RFC 1213, March 1991.

[4]  SNMPv2 Working Group, J. Case, K. McCloghrie, M. Rose, S.
     Waldbusser, "Protocol Operations for version 2 of the
     Simple Network Management Protocol (SNMPv2)",
     RFC 1905, January 1996.

[5]  McCloghrie, K., and F. Kastenholz, "Evolution of the
     Interfaces Group of MIB-II", RFC 1573, January 1994.

[6]  Information processing systems -- Open Systems
     Interconnection -- Specification of Abstract Syntax
     Notation One (ASN.1), International Organization for
     Standardization.  International Standard 8824, (December,
     1987).

[7]  Information processing systems -- Open Systems
     Interconnection -- Specification of Basic Encoding Rules
     for Abstract Notation One (ASN.1), International
     Organization for Standardization.  International Standard
     8825, (December, 1987).

[8]  Rose, M., Editor, "A Convention for Defining Traps for
     use with the SNMP", RFC 1215, March 1991.

[9]  Waldbusser, S., "Remote Network Monitoring Management
     Information Base", RFC 1757, February 1995.

[10] Waldbusser, S., "Token Ring Extensions to the Remote Network
     Monitoring MIB", RFC 1513, September 1993.

11. Author's Address

Steven Waldbusser
International Network Services

   Phone: (415) 254-4251
   EMail: waldbusser@ins.com