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RFC 4502

 
 
 

Remote Network Monitoring Management Information Base Version 2

Part 2 of 5, p. 11 to 46
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6.  Definitions

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

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    ringStationControlEntry, sourceRoutingStatsEntry
                                    FROM TOKEN-RING-RMON-MIB;
--  Remote Network Monitoring MIB

rmon MODULE-IDENTITY
    LAST-UPDATED "200605020000Z"    -- May 2, 2006
    ORGANIZATION "IETF RMON MIB Working Group"
    CONTACT-INFO
        "Author:
                     Steve Waldbusser
             Phone:  +1-650-948-6500
             Fax :   +1-650-745-0671
             Email:  waldbusser@nextbeacon.com

         Working Group Chair:
                     Andy Bierman
             E-mail: ietf@andybierman.com

         Working Group Mailing List: <rmonmib@ietf.org>
         To subscribe send email to: <rmonmib-request@ietf.org>    "
    DESCRIPTION
        "The MIB module for managing remote monitoring
         device implementations.  This MIB module
         extends the architecture introduced in the original
         RMON MIB as specified in RFC 2819.

         Copyright (C) The Internet Society (2006).  This version of
         this MIB module is part of RFC 4502;  see the RFC itself for
         full legal notices."

    REVISION "200605020000Z"    -- May 2, 2006
    DESCRIPTION
        "This version updates the proposed-standard version of the
        RMON2 MIB (published as RFC 2021) by adding 2 new
        enumerations to the nlMatrixTopNControlRateBase object and
        4 new enumerations to the alMatrixTopNControlRateBase object.
        These new enumerations support the creation of high-capacity
        topN reports in the High Capacity RMON MIB [RFC3273].

        Additionally, the following objects have been deprecated, as
        they have not had enough independent implementations to
        demonstrate interoperability to meet the requirements of a
        Draft Standard:

        probeDownloadFile
        probeDownloadTFTPServer
        probeDownloadAction
        probeDownloadStatus

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        serialMode
        serialProtocol
        serialTimeout
        serialModemInitString
        serialModemHangUpString
        serialModemConnectResp
        serialModemNoConnectResp
        serialDialoutTimeout
        serialStatus
        serialConnectDestIpAddress
        serialConnectType
        serialConnectDialString
        serialConnectSwitchConnectSeq
        serialConnectSwitchDisconnectSeq
        serialConnectSwitchResetSeq
        serialConnectOwner
        serialConnectStatus
        netConfigIPAddress
        netConfigSubnetMask
        netConfigStatus
        netDefaultGateway
        tokenRingMLStats2DroppedFrames
        tokenRingMLStats2CreateTime
        tokenRingPStats2DroppedFrames
        tokenRingPStats2CreateTime
        ringStationControl2DroppedFrames
        ringStationControl2CreateTime
        sourceRoutingStats2DroppedFrames
        sourceRoutingStats2CreateTime
        trapDestIndex
        trapDestCommunity
        trapDestProtocol
        trapDestAddress
        trapDestOwner
        trapDestStatus

        In addition, two corrections were made.  The LastCreateTime
        Textual Convention had been defined with a base type of
        another textual convention, which isn't allowed in SMIv2.  The
        definition has been modified to use TimeTicks as the base
        type.

        Further, the SerialConfigEntry SEQUENCE definition included
        sub-typing information that is not allowed in SMIv2.  This
        information has been deleted.  Ranges were added to a number of
        objects and textual-conventions to constrain their maximum
        (and sometimes minimum) sizes.  The addition of these ranges
        documents existing practice for these objects.  These objects

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        are:
            ControlString
            protocolDirID
            protocolDirParameters
            addressMapNetworkAddress
            nlHostAddress
            nlMatrixSDSourceAddress
            nlMatrixSDDestAddress
            nlMatrixDSSourceAddress
            nlMatrixDSDestAddress
            nlMatrixTopNSourceAddress
            nlMatrixTopNDestAddress
            alHostEntry
            alMatrixSDEntry
            alMatrixDSEntry
            alMatrixTopNSourceAddress
            alMatrixTopNDestAddress

        Finally, the TimeFilter TC has been updated to encourage agent
        implementations that allow a MIB walk to behave well even when
        performed by an application that is not aware of the special
        TimeFilter semantics."

    REVISION "200207080000Z"        -- 08 July, 2002
    DESCRIPTION
        "Added new enumerations to support the High-Capacity RMON
        MIB as defined in RFC 3273.  Also fixed some typos and
        added clarifications."

    REVISION "199605270000Z"    -- 27 May, 1996
    DESCRIPTION
        "Original version.  Published as RFC 2021."
    ::= { mib-2 16 }

-- { rmon 1 } through { rmon 10 } are defined in RMON and
-- the Token Ring RMON MIB [RFC1513]

    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 }

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-- Textual Conventions

ZeroBasedCounter32 ::= TEXTUAL-CONVENTION
    STATUS current
    DESCRIPTION
        "This TC describes an object that 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 value of the
        sysUpTime object at 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.

        If sysUpTime is reset to zero as a result of a re-
        initialization of the network management (sub)system, then
        the values of all LastCreateTime objects are also reset.
        However, after approximately 497 days without a re-
        initialization, the sysUpTime object will reach 2^^32-1 and
        then increment to zero; in this case, existing values
        of TimeStamp objects do not change.  This can lead to
        ambiguities in the value of TimeStamp objects."
    SYNTAX TimeTicks

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.

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      Note that this is not a history mechanism.  Only current values
      of underlying objects are returned; saved instance values
      associated with particular values of sysUpTime are not.

      An entry is considered changed if the value of any object in the
      entry changes, if the row is created, or if any object in the
      entry is created or deleted.  Note that deleted entries cannot
      be detected or downloaded.

      A time-filtered conceptual table is created by inserting a
      single object of SYNTAX TimeFilter as the first INDEX component
      in a copy of an existing basic conceptual table (i.e., any
      SEQUENCE without a TimeFilter INDEX component).  Thus, for
      each conceptual entry 'I' in the basic table, there exists N
      conceptual entries in the time-filtered version, indexed N.I,
      where 'N' is equal to the value of sysUpTime.

      When an application retrieves conceptual instances from a
      time-filtered table, and an INDEX value is provided for the
      TimeFilter INDEX component 'N', the agent will only consider
      returning basic conceptual entries (e.g., 'fooColumn.N.I') if
      any column within the basic conceptual entry has changed since
      sysUpTime 'N'.  If not, the basic conceptual entry will
      be ignored for the particular retrieval operation.

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

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

      As an entry in a time-filtered table is updated (i.e., one of
      the columns in the basic conceptual table is changed), new
      conceptual entries are also created in the time-filtered version
      (which still shares the now updated object values with all other
      instances).  The number of unique time-filtered instances that
      are created is determined by the value of sysUpTime at which the
      basic entry was last updated.  One unique instance will exist
      for each value of sysUpTime at the last update time for the row.
      However, a new TimeFilter index instance is created for each new
      sysUpTime value.  The TimeFilter index values not associated
      with entry updates are called duplicate time-filtered instances.

      After some deployment experience, it has been determined that
      a time-filtered table is more efficient if the agent
      stops a MIB walk operation by skipping over rows with a
      TimeFilter index value higher than the value in the received
      GetNext/GetBulk request.  That is, instead of incrementing a
      TimeFilter index value, the agent will continue to the next

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      object or table.  As a consequence, GetNext or GetBulk
      operations will provide only one pass through a time-filtered
      table.

      It is suggested that an agent implement a time-filtered table
      in this manner to improve performance and avoid a MIB walk
      getting stuck in time-filtered tables.  It is, however, still
      acceptable for an agent to implement a time-filtered table in
      the traditional manner (i.e., every conceptual time-filtered
      instance is returned in GetNext and GetBulk PDU responses), and
      management applications must be able to deal with such
      traditional implementations.

      See the appendix for further discussion of this textual
      convention.

      The following example is provided to demonstrate TimeFilter
      behavior:

      Consider the following basic conceptual table, basicFooTable.
      (Note that the basic version of a time-filtered table may not
      actually be defined.)

          basicFooTable:

          basicFooTable ...
          INDEX { fooIndex }

          BasicFooEntry {
             fooIndex     Integer32,
             fooCounts    Counter32
          }

      For this example, the basicFooTable contains two static
      conceptual entries (fooIndex equals '1' and '2'), created at
      time zero.  It also contains one dynamic conceptual entry
      (fooIndex equals '3'), which is created at time '3' and deleted
      at time '7'.

      The time-filtered version of the basicFooTable could be defined
      as follows:

          FooTable:

          fooTable ...
          INDEX { fooTimeMark, fooIndex }

          FooEntry {

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             fooTimeMark  TimeFilter,
             fooIndex     Integer32,
             fooCounts    Counter32
          }


      Note that entries exist in the time-filtered conceptual table
      only if they actually exist in the underlying (basic) table.

      For this example, the fooTable will have three underlying
      basic entries (fooIndex == 1, 2, and 3), with the following
      activity (for sysUpTime equal 0 to 9):

         - fooEntry.N.1 is created at time '0' and most recently
           updated at time '6' to the value '5'.
         - fooEntry.N.2 is created at time '0' and most recently
           updated at time '8' to the value '9'.
         - fooEntry.N.3 is created at time '3', updated at time '5'
           to the value '17', and deleted at time '7'.

     The following tables show the values that would be returned for
     MIB walk operations with various TimeFilter values, done at
     different times.  An application issues a retrieval request at
     time 'T', with a TimeFilter value, 'N' (typically set to a lower
     value, such as the value of sysUpTime at the last polling cycle).

     The following values would be returned in a MIB walk of
     fooCounts.N if T equals '0' and N equals '0':

           fooCounts.N.I    Value
           ==========================
           fooCounts.0.1    0
           fooCounts.0.2    0

       Note that nothing is returned for fooCounts.0.3, since that
       entry does not exist at sysUpTime equals '0'.

     The following values would be returned in a full (traditional) MIB
     walk of fooCounts.N if T equals '3' and N equals '0':

           fooCounts.N.I    Value
           =======================
           fooCounts.0.1    0
           fooCounts.0.2    0
           fooCounts.0.3    0
           fooCounts.1.3    0
           fooCounts.2.3    0
           fooCounts.3.3    0

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       Note that there are no instances for T equals 1 or 2 for the
       first two values of N, as these entries did not change
       since they were created at time '0'.

       Note that the current value for 'fooCounts.N.3' is returned
       here, even for values of N less than '3' (when the entry was
       created).  The agent only considers the current existence of an
       entry in the TimeFilter algorithm, not the time when the entry
       was created.

       Note that the instances 'fooCounts.0.3', 'fooCounts.1.3',
       and 'fooCounts.2.3' are duplicates and can be suppressed by the
       agent in a MIB walk.

     The following values would be returned in a full (traditional)
     MIB walk of fooCounts.N if T equals '6' and N equals '3':

           fooCounts.N.I    Value
           =======================
           fooCounts.3.1    5
           fooCounts.3.3    17
           fooCounts.4.1    5
           fooCounts.4.3    17
           fooCounts.5.1    5
           fooCounts.5.3    17
           fooCounts.6.1    5

        Note that no instances for entry 'fooCounts.N.2' are returned,
        since it has not changed since time '3'.

        Note that all instances except 'fooCounts.5.3' and
        'fooCounts.6.1' are duplicates and can be suppressed by the
        agent in a MIB walk.

     The following values would be returned in a full (traditional)
     MIB walk of fooCounts.N if T equals '9' and N equals '6':

           fooCounts.N.I    Value
           =======================
           fooCounts.6.1    5
           fooCounts.6.2    9
           fooCounts.7.2    9
           fooCounts.8.2    9

        Note that no instances for entry 'fooCounts.N.3' are returned,
        since it was deleted at time '7'.

        Note that instances 'fooCounts.6.2' and 'fooCounts.7.2'

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        are duplicates and can be suppressed by the agent in a MIB
        walk."

  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 [RFC2863], 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 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

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        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.

         Note that some combinations of index values may result in an
         index that exceeds 128 sub-identifiers in length, which exceeds
         the maximum for the SNMP protocol.  Implementations should take
         care to avoid such combinations."
    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  (SIZE (4..128))
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A unique identifier for a particular protocol.  Standard
        identifiers will be defined in such a manner that they

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        can often be used as specifications for new protocols - i.e.,
        a tree-structured assignment mechanism that matches the
        protocol encapsulation 'tree' and that has algorithmic
        assignment mechanisms for certain subtrees.  See RFC 2074 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
        possible ethernet protocol types, nor need it create them on
        the fly when it sees them.  Whether 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 (SIZE (1..32))
    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

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        "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 that 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 this protocol directory entry can be extended
         by the user by creating protocol directory entries that are
         children of this protocol.

         An example of an entry that will often allow extensibility is

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         '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 extendable.  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 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 protocol 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,

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        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

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        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, 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
        both of the nlMatrixTables and both of the
        alMatrixTables.

        If the associated protocolDirType object has the
        addressRecognitionCapable bit set, then this is a network-

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        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, 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.

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        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 }

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    ::= { 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 that were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        that 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.

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        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 that 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

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        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 and 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 of this protocol type received
        without errors.  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 of this protocol type

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        received since it was added to the protocolDistStatsTable
        (excluding framing bits, but including FCS octets), except for
        those octets in packets that contained errors.

        Note that 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

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    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 mappings from network
         layer address to physical address to interface.

        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"

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    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 that were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        that 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

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    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 mappings from network layer address to physical
        address to interface.

        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.

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        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.

        Note that some combinations of index values may result in an
        index that exceeds 128 sub-identifiers in length, which exceeds
        the maximum for the SNMP protocol.  Implementations should take
        care to avoid such combinations."
    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 (SIZE (1..255))
    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

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    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 [RFC2863], 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 [RFC2108], 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 that 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.

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        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 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

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        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

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

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        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 that were received by the probe
        and therefore not accounted for in the *StatsDropEvents, but
        that the probe chose not to count for the associated

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        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

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        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

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        "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.

        Note that some combinations of index values may result in an
        index that exceeds 128 sub-identifiers in length, which exceeds
        the maximum for the SNMP protocol.  Implementations should take

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        care to avoid such combinations."
    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  (SIZE (1..255))
    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

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        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
        octets in packets that contained errors.

        Note that 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
        octets in packets that contained errors.

        Note that this doesn't count just those octets in the particular
        protocol frames but includes the entire packet that contained
        the protocol."
    ::= { nlHostEntry 6 }


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