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RFC 3635

 
 
 

Definitions of Managed Objects for the Ethernet-like Interface Types

Part 2 of 3, p. 17 to 38
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4.  Definitions

   EtherLike-MIB DEFINITIONS ::= BEGIN

       IMPORTS
           MODULE-IDENTITY, OBJECT-TYPE, OBJECT-IDENTITY,
           Integer32, Counter32, Counter64, mib-2, transmission
               FROM SNMPv2-SMI
           MODULE-COMPLIANCE, OBJECT-GROUP
               FROM SNMPv2-CONF
           TruthValue
               FROM SNMPv2-TC
           ifIndex, InterfaceIndex
               FROM IF-MIB;

       etherMIB MODULE-IDENTITY
           LAST-UPDATED "200309190000Z"  -- September 19, 2003
           ORGANIZATION "IETF Ethernet Interfaces and Hub MIB
                        Working Group"
           CONTACT-INFO
               "WG E-mail: hubmib@ietf.org
             To subscribe: hubmib-request@ietf.org

                    Chair: Dan Romascanu
                   Postal: Avaya Inc.
                           Atidum Technology Park, Bldg. 3
                           Tel Aviv 61131
                           Israel
                      Tel: +972 3 645 8414
                   E-mail: dromasca@avaya.com

                  Editor: John Flick
                  Postal: Hewlett-Packard Company
                          8000 Foothills Blvd. M/S 5557
                          Roseville, CA 95747-5557
                          USA
                     Tel: +1 916 785 4018
                     Fax: +1 916 785 1199
                  E-mail: johnf@rose.hp.com"

           DESCRIPTION "The MIB module to describe generic objects for
                       ethernet-like network interfaces.

                       The following reference is used throughout this
                       MIB module:

                       [IEEE 802.3 Std] refers to:
                          IEEE Std 802.3, 2002 Edition: 'IEEE Standard

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                          for Information technology -
                          Telecommunications and information exchange
                          between systems - Local and metropolitan
                          area networks - Specific requirements -
                          Part 3: Carrier sense multiple access with
                          collision detection (CSMA/CD) access method
                          and physical layer specifications', as
                          amended by IEEE Std 802.3ae-2002:
                          'Amendment: Media Access Control (MAC)
                          Parameters, Physical Layer, and Management
                          Parameters for 10 Gb/s Operation', August,
                          2002.

                       Of particular interest is Clause 30, '10 Mb/s,
                       100 Mb/s, 1000 Mb/s, and 10 Gb/s Management'.

                       Copyright (C) The Internet Society (2003).  This
                       version of this MIB module is part of RFC 3635;
                       see the RFC itself for full legal notices."

           REVISION    "200309190000Z"  -- September 19, 2003
           DESCRIPTION "Updated to include support for 10 Gb/sec
                        interfaces.  This resulted in the following
                        revisions:

                        - Updated dot3StatsAlignmentErrors and
                          dot3StatsSymbolErrors DESCRIPTIONs to
                          reflect behaviour at 10 Gb/s
                        - Added dot3StatsRateControlAbility and
                          dot3RateControlStatus for management
                          of the Rate Control function in 10 Gb/s
                          WAN applications
                        - Added 64-bit versions of all counters
                          that are used on high-speed ethernet
                          interfaces
                        - Added object groups to contain the new
                          objects
                        - Deprecated etherStatsBaseGroup and
                          split into etherStatsBaseGroup2 and
                          etherStatsHalfDuplexGroup, so that
                          interfaces which can only operate at
                          full-duplex do not need to implement
                          half-duplex-only statistics
                        - Deprecated dot3Compliance and replaced
                          it with dot3Compliance2, which includes
                          the compliance information for the new
                          object groups

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                        In addition, the dot3Tests and dot3Errors
                        object identities have been deprecated,
                        since there is no longer a standard method
                        for using them.

                        This version published as RFC 3635."

           REVISION    "199908240400Z"  -- August 24, 1999
           DESCRIPTION "Updated to include support for 1000 Mb/sec
                        interfaces and full-duplex interfaces.
                        This version published as RFC 2665."

           REVISION    "199806032150Z"  -- June 3, 1998
           DESCRIPTION "Updated to include support for 100 Mb/sec
                        interfaces.
                        This version published as RFC 2358."

           REVISION    "199402030400Z"  -- February 3, 1994
           DESCRIPTION "Initial version, published as RFC 1650."
           ::= { mib-2 35 }

       etherMIBObjects OBJECT IDENTIFIER ::= { etherMIB 1 }

       dot3    OBJECT IDENTIFIER ::= { transmission 7 }

       -- the Ethernet-like Statistics group

       dot3StatsTable OBJECT-TYPE
           SYNTAX     SEQUENCE OF Dot3StatsEntry
           MAX-ACCESS not-accessible
           STATUS     current
           DESCRIPTION "Statistics for a collection of ethernet-like
                       interfaces attached to a particular system.
                       There will be one row in this table for each
                       ethernet-like interface in the system."
           ::= { dot3 2 }

       dot3StatsEntry OBJECT-TYPE
           SYNTAX     Dot3StatsEntry
           MAX-ACCESS not-accessible
           STATUS     current
           DESCRIPTION "Statistics for a particular interface to an
                       ethernet-like medium."
           INDEX       { dot3StatsIndex }
           ::= { dot3StatsTable 1 }

       Dot3StatsEntry ::=
           SEQUENCE {

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               dot3StatsIndex                      InterfaceIndex,
               dot3StatsAlignmentErrors            Counter32,
               dot3StatsFCSErrors                  Counter32,
               dot3StatsSingleCollisionFrames      Counter32,
               dot3StatsMultipleCollisionFrames    Counter32,
               dot3StatsSQETestErrors              Counter32,
               dot3StatsDeferredTransmissions      Counter32,
               dot3StatsLateCollisions             Counter32,
               dot3StatsExcessiveCollisions        Counter32,
               dot3StatsInternalMacTransmitErrors  Counter32,
               dot3StatsCarrierSenseErrors         Counter32,
               dot3StatsFrameTooLongs              Counter32,
               dot3StatsInternalMacReceiveErrors   Counter32,
               dot3StatsEtherChipSet               OBJECT IDENTIFIER,
               dot3StatsSymbolErrors               Counter32,
               dot3StatsDuplexStatus               INTEGER,
               dot3StatsRateControlAbility         TruthValue,
               dot3StatsRateControlStatus          INTEGER
           }

       dot3StatsIndex OBJECT-TYPE
           SYNTAX      InterfaceIndex
           MAX-ACCESS  read-only  -- read-only since originally an
                                  -- SMIv1 index
           STATUS      current
           DESCRIPTION "An index value that uniquely identifies an
                       interface to an ethernet-like medium.  The
                       interface identified by a particular value of
                       this index is the same interface as identified
                       by the same value of ifIndex."
           REFERENCE   "RFC 2863, ifIndex"
           ::= { dot3StatsEntry 1 }

       dot3StatsAlignmentErrors OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of frames received on a particular
                       interface that are not an integral number of
                       octets in length and do not pass the FCS check.

                       The count represented by an instance of this
                       object is incremented when the alignmentError
                       status is returned by the MAC service to the
                       LLC (or other MAC user). Received frames for
                       which multiple error conditions pertain are,
                       according to the conventions of IEEE 802.3
                       Layer Management, counted exclusively according

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                       to the error status presented to the LLC.

                       This counter does not increment for group
                       encoding schemes greater than 4 bits per group.

                       For interfaces operating at 10 Gb/s, this
                       counter can roll over in less than 5 minutes if
                       it is incrementing at its maximum rate.  Since
                       that amount of time could be less than a
                       management station's poll cycle time, in order
                       to avoid a loss of information, a management
                       station is advised to poll the
                       dot3HCStatsAlignmentErrors object for 10 Gb/s
                       or faster interfaces.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.7,
                       aAlignmentErrors"
           ::= { dot3StatsEntry 2 }

       dot3StatsFCSErrors OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of frames received on a particular
                       interface that are an integral number of octets
                       in length but do not pass the FCS check.  This
                       count does not include frames received with
                       frame-too-long or frame-too-short error.

                       The count represented by an instance of this
                       object is incremented when the frameCheckError
                       status is returned by the MAC service to the
                       LLC (or other MAC user). Received frames for
                       which multiple error conditions pertain are,
                       according to the conventions of IEEE 802.3
                       Layer Management, counted exclusively according
                       to the error status presented to the LLC.

                       Note:  Coding errors detected by the physical
                       layer for speeds above 10 Mb/s will cause the
                       frame to fail the FCS check.

                       For interfaces operating at 10 Gb/s, this
                       counter can roll over in less than 5 minutes if

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                       it is incrementing at its maximum rate.  Since
                       that amount of time could be less than a
                       management station's poll cycle time, in order
                       to avoid a loss of information, a management
                       station is advised to poll the
                       dot3HCStatsFCSErrors object for 10 Gb/s or
                       faster interfaces.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.6,
                       aFrameCheckSequenceErrors."
           ::= { dot3StatsEntry 3 }

       dot3StatsSingleCollisionFrames OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of frames that are involved in a single
                       collision, and are subsequently transmitted
                       successfully.

                       A frame that is counted by an instance of this
                       object is also counted by the corresponding
                       instance of either the ifOutUcastPkts,
                       ifOutMulticastPkts, or ifOutBroadcastPkts,
                       and is not counted by the corresponding
                       instance of the dot3StatsMultipleCollisionFrames
                       object.

                       This counter does not increment when the
                       interface is operating in full-duplex mode.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.3,
                       aSingleCollisionFrames."
           ::= { dot3StatsEntry 4 }

       dot3StatsMultipleCollisionFrames OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of frames that are involved in more

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                       than one collision and are subsequently
                       transmitted successfully.

                       A frame that is counted by an instance of this
                       object is also counted by the corresponding
                       instance of either the ifOutUcastPkts,
                       ifOutMulticastPkts, or ifOutBroadcastPkts,
                       and is not counted by the corresponding
                       instance of the dot3StatsSingleCollisionFrames
                       object.

                       This counter does not increment when the
                       interface is operating in full-duplex mode.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.4,
                       aMultipleCollisionFrames."
           ::= { dot3StatsEntry 5 }

       dot3StatsSQETestErrors OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of times that the SQE TEST ERROR
                       is received on a particular interface. The
                       SQE TEST ERROR is set in accordance with the
                       rules for verification of the SQE detection
                       mechanism in the PLS Carrier Sense Function as
                       described in IEEE Std. 802.3, 2000 Edition,
                       section 7.2.4.6.

                       This counter does not increment on interfaces
                       operating at speeds greater than 10 Mb/s, or on
                       interfaces operating in full-duplex mode.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 7.2.4.6, also 30.3.2.1.4,
                       aSQETestErrors."
           ::= { dot3StatsEntry 6 }

       dot3StatsDeferredTransmissions OBJECT-TYPE
           SYNTAX      Counter32

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           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of frames for which the first
                       transmission attempt on a particular interface
                       is delayed because the medium is busy.

                       The count represented by an instance of this
                       object does not include frames involved in
                       collisions.

                       This counter does not increment when the
                       interface is operating in full-duplex mode.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.9,
                       aFramesWithDeferredXmissions."
           ::= { dot3StatsEntry 7 }

       dot3StatsLateCollisions OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "The number of times that a collision is
                       detected on a particular interface later than
                       one slotTime into the transmission of a packet.

                       A (late) collision included in a count
                       represented by an instance of this object is
                       also considered as a (generic) collision for
                       purposes of other collision-related
                       statistics.

                       This counter does not increment when the
                       interface is operating in full-duplex mode.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.10,
                       aLateCollisions."
           ::= { dot3StatsEntry 8 }

       dot3StatsExcessiveCollisions OBJECT-TYPE
           SYNTAX      Counter32

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           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of frames for which transmission on a
                       particular interface fails due to excessive
                       collisions.

                       This counter does not increment when the
                       interface is operating in full-duplex mode.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.11,
                       aFramesAbortedDueToXSColls."
           ::= { dot3StatsEntry 9 }

       dot3StatsInternalMacTransmitErrors OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of frames for which transmission on a
                       particular interface fails due to an internal
                       MAC sublayer transmit error. A frame is only
                       counted by an instance of this object if it is
                       not counted by the corresponding instance of
                       either the dot3StatsLateCollisions object, the
                       dot3StatsExcessiveCollisions object, or the
                       dot3StatsCarrierSenseErrors object.

                       The precise meaning of the count represented by
                       an instance of this object is implementation-
                       specific.  In particular, an instance of this
                       object may represent a count of transmission
                       errors on a particular interface that are not
                       otherwise counted.

                       For interfaces operating at 10 Gb/s, this
                       counter can roll over in less than 5 minutes if
                       it is incrementing at its maximum rate.  Since
                       that amount of time could be less than a
                       management station's poll cycle time, in order
                       to avoid a loss of information, a management
                       station is advised to poll the
                       dot3HCStatsInternalMacTransmitErrors object for
                       10 Gb/s or faster interfaces.

                       Discontinuities in the value of this counter can

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                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.12,
                       aFramesLostDueToIntMACXmitError."
           ::= { dot3StatsEntry 10 }

       dot3StatsCarrierSenseErrors OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "The number of times that the carrier sense
                       condition was lost or never asserted when
                       attempting to transmit a frame on a particular
                       interface.

                       The count represented by an instance of this
                       object is incremented at most once per
                       transmission attempt, even if the carrier sense
                       condition fluctuates during a transmission
                       attempt.

                       This counter does not increment when the
                       interface is operating in full-duplex mode.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.13,
                       aCarrierSenseErrors."
           ::= { dot3StatsEntry 11 }

       -- { dot3StatsEntry 12 } is not assigned

       dot3StatsFrameTooLongs OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of frames received on a particular
                       interface that exceed the maximum permitted
                       frame size.

                       The count represented by an instance of this
                       object is incremented when the frameTooLong
                       status is returned by the MAC service to the
                       LLC (or other MAC user). Received frames for
                       which multiple error conditions pertain are,

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                       according to the conventions of IEEE 802.3
                       Layer Management, counted exclusively according
                       to the error status presented to the LLC.

                       For interfaces operating at 10 Gb/s, this
                       counter can roll over in less than 80 minutes if
                       it is incrementing at its maximum rate.  Since
                       that amount of time could be less than a
                       management station's poll cycle time, in order
                       to avoid a loss of information, a management
                       station is advised to poll the
                       dot3HCStatsFrameTooLongs object for 10 Gb/s
                       or faster interfaces.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.25,
                       aFrameTooLongErrors."
           ::= { dot3StatsEntry 13 }

       -- { dot3StatsEntry 14 } is not assigned

       -- { dot3StatsEntry 15 } is not assigned

       dot3StatsInternalMacReceiveErrors OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of frames for which reception on a
                       particular interface fails due to an internal
                       MAC sublayer receive error. A frame is only
                       counted by an instance of this object if it is
                       not counted by the corresponding instance of
                       either the dot3StatsFrameTooLongs object, the
                       dot3StatsAlignmentErrors object, or the
                       dot3StatsFCSErrors object.

                       The precise meaning of the count represented by
                       an instance of this object is implementation-
                       specific.  In particular, an instance of this
                       object may represent a count of receive errors
                       on a particular interface that are not
                       otherwise counted.

                       For interfaces operating at 10 Gb/s, this
                       counter can roll over in less than 5 minutes if

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                       it is incrementing at its maximum rate.  Since
                       that amount of time could be less than a
                       management station's poll cycle time, in order
                       to avoid a loss of information, a management
                       station is advised to poll the
                       dot3HCStatsInternalMacReceiveErrors object for
                       10 Gb/s or faster interfaces.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.15,
                       aFramesLostDueToIntMACRcvError."
           ::= { dot3StatsEntry 16 }

       dot3StatsEtherChipSet OBJECT-TYPE
           SYNTAX      OBJECT IDENTIFIER
           MAX-ACCESS  read-only
           STATUS      deprecated
           DESCRIPTION "******** THIS OBJECT IS DEPRECATED ********

                       This object contains an OBJECT IDENTIFIER
                       which identifies the chipset used to
                       realize the interface. Ethernet-like
                       interfaces are typically built out of
                       several different chips. The MIB implementor
                       is presented with a decision of which chip
                       to identify via this object. The implementor
                       should identify the chip which is usually
                       called the Medium Access Control chip.
                       If no such chip is easily identifiable,
                       the implementor should identify the chip
                       which actually gathers the transmit
                       and receive statistics and error
                       indications. This would allow a
                       manager station to correlate the
                       statistics and the chip generating
                       them, giving it the ability to take
                       into account any known anomalies
                       in the chip.

                       This object has been deprecated.  Implementation
                       feedback indicates that it is of limited use for
                       debugging network problems in the field, and
                       the administrative overhead involved in
                       maintaining a registry of chipset OIDs is not
                       justified."

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           ::= { dot3StatsEntry 17 }

       dot3StatsSymbolErrors OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "For an interface operating at 100 Mb/s, the
                       number of times there was an invalid data symbol
                       when a valid carrier was present.

                       For an interface operating in half-duplex mode
                       at 1000 Mb/s, the number of times the receiving
                       media is non-idle (a carrier event) for a period
                       of time equal to or greater than slotTime, and
                       during which there was at least one occurrence
                       of an event that causes the PHY to indicate
                       'Data reception error' or 'carrier extend error'
                       on the GMII.

                       For an interface operating in full-duplex mode
                       at 1000 Mb/s, the number of times the receiving
                       media is non-idle (a carrier event) for a period
                       of time equal to or greater than minFrameSize,
                       and during which there was at least one
                       occurrence of an event that causes the PHY to
                       indicate 'Data reception error' on the GMII.

                       For an interface operating at 10 Gb/s, the
                       number of times the receiving media is non-idle
                       (a carrier event) for a period of time equal to
                       or greater than minFrameSize, and during which
                       there was at least one occurrence of an event
                       that causes the PHY to indicate 'Receive Error'
                       on the XGMII.

                       The count represented by an instance of this
                       object is incremented at most once per carrier
                       event, even if multiple symbol errors occur
                       during the carrier event.  This count does
                       not increment if a collision is present.

                       This counter does not increment when the
                       interface is operating at 10 Mb/s.

                       For interfaces operating at 10 Gb/s, this
                       counter can roll over in less than 5 minutes if
                       it is incrementing at its maximum rate.  Since
                       that amount of time could be less than a

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                       management station's poll cycle time, in order
                       to avoid a loss of information, a management
                       station is advised to poll the
                       dot3HCStatsSymbolErrors object for 10 Gb/s
                       or faster interfaces.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.2.1.5,
                       aSymbolErrorDuringCarrier."
           ::= { dot3StatsEntry 18 }

       dot3StatsDuplexStatus OBJECT-TYPE
           SYNTAX      INTEGER {
                           unknown(1),
                           halfDuplex(2),
                           fullDuplex(3)
                       }
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "The current mode of operation of the MAC
                       entity.  'unknown' indicates that the current
                       duplex mode could not be determined.

                       Management control of the duplex mode is
                       accomplished through the MAU MIB.  When
                       an interface does not support autonegotiation,
                       or when autonegotiation is not enabled, the
                       duplex mode is controlled using
                       ifMauDefaultType.  When autonegotiation is
                       supported and enabled, duplex mode is controlled
                       using ifMauAutoNegAdvertisedBits.  In either
                       case, the currently operating duplex mode is
                       reflected both in this object and in ifMauType.

                       Note that this object provides redundant
                       information with ifMauType.  Normally, redundant
                       objects are discouraged.  However, in this
                       instance, it allows a management application to
                       determine the duplex status of an interface
                       without having to know every possible value of
                       ifMauType.  This was felt to be sufficiently
                       valuable to justify the redundancy."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.32,
                       aDuplexStatus."
           ::= { dot3StatsEntry 19 }

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       dot3StatsRateControlAbility OBJECT-TYPE
           SYNTAX      TruthValue
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "'true' for interfaces operating at speeds above
                       1000 Mb/s that support Rate Control through
                       lowering the average data rate of the MAC
                       sublayer, with frame granularity, and 'false'
                       otherwise."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.33,
                       aRateControlAbility."
           ::= { dot3StatsEntry 20 }

       dot3StatsRateControlStatus OBJECT-TYPE
           SYNTAX      INTEGER {
                           rateControlOff(1),
                           rateControlOn(2),
                           unknown(3)
                       }
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "The current Rate Control mode of operation of
                       the MAC sublayer of this interface."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.34,
                       aRateControlStatus."
           ::= { dot3StatsEntry 21 }

       -- the Ethernet-like Collision Statistics group

       -- Implementation of this group is optional; it is appropriate
       -- for all systems which have the necessary metering

       dot3CollTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF Dot3CollEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION "A collection of collision histograms for a
                       particular set of interfaces."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.30,
                       aCollisionFrames."
           ::= { dot3 5 }

       dot3CollEntry OBJECT-TYPE
           SYNTAX      Dot3CollEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION "A cell in the histogram of per-frame
                       collisions for a particular interface.  An

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                       instance of this object represents the
                       frequency of individual MAC frames for which
                       the transmission (successful or otherwise) on a
                       particular interface is accompanied by a
                       particular number of media collisions."
           INDEX       { ifIndex, dot3CollCount }
           ::= { dot3CollTable 1 }

       Dot3CollEntry ::=
           SEQUENCE {
               dot3CollCount        Integer32,
               dot3CollFrequencies  Counter32
           }

       -- { dot3CollEntry 1 } is no longer in use

       dot3CollCount OBJECT-TYPE
           SYNTAX      Integer32 (1..16)
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION "The number of per-frame media collisions for
                       which a particular collision histogram cell
                       represents the frequency on a particular
                       interface."
           ::= { dot3CollEntry 2 }

       dot3CollFrequencies OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of individual MAC frames for which the
                       transmission (successful or otherwise) on a
                       particular interface occurs after the
                       frame has experienced exactly the number
                       of collisions in the associated
                       dot3CollCount object.

                       For example, a frame which is transmitted
                       on interface 77 after experiencing
                       exactly 4 collisions would be indicated
                       by incrementing only dot3CollFrequencies.77.4.
                       No other instance of dot3CollFrequencies would
                       be incremented in this example.

                       This counter does not increment when the
                       interface is operating in full-duplex mode.

                       Discontinuities in the value of this counter can

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                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           ::= { dot3CollEntry 3 }

       dot3ControlTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF Dot3ControlEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION "A table of descriptive and status information
                       about the MAC Control sublayer on the
                       ethernet-like interfaces attached to a
                       particular system.  There will be one row in
                       this table for each ethernet-like interface in
                       the system which implements the MAC Control
                       sublayer.  If some, but not all, of the
                       ethernet-like interfaces in the system implement
                       the MAC Control sublayer, there will be fewer
                       rows in this table than in the dot3StatsTable."
           ::= { dot3 9 }

       dot3ControlEntry OBJECT-TYPE
           SYNTAX      Dot3ControlEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION "An entry in the table, containing information
                       about the MAC Control sublayer on a single
                       ethernet-like interface."
           INDEX       { dot3StatsIndex }
           ::= { dot3ControlTable 1 }

       Dot3ControlEntry ::=
           SEQUENCE {
               dot3ControlFunctionsSupported       BITS,
               dot3ControlInUnknownOpcodes         Counter32,
               dot3HCControlInUnknownOpcodes       Counter64
           }

       dot3ControlFunctionsSupported OBJECT-TYPE
           SYNTAX      BITS {
                           pause(0)   -- 802.3 flow control
                       }
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A list of the possible MAC Control functions
                       implemented for this interface."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.3.2,
                       aMACControlFunctionsSupported."

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           ::= { dot3ControlEntry 1 }

       dot3ControlInUnknownOpcodes OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of MAC Control frames received on this
                       interface that contain an opcode that is not
                       supported by this device.

                       For interfaces operating at 10 Gb/s, this
                       counter can roll over in less than 5 minutes if
                       it is incrementing at its maximum rate.  Since
                       that amount of time could be less than a
                       management station's poll cycle time, in order
                       to avoid a loss of information, a management
                       station is advised to poll the
                       dot3HCControlInUnknownOpcodes object for 10 Gb/s
                       or faster interfaces.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.3.5,
                       aUnsupportedOpcodesReceived"
           ::= { dot3ControlEntry 2 }

       dot3HCControlInUnknownOpcodes OBJECT-TYPE
           SYNTAX      Counter64
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of MAC Control frames received on this
                       interface that contain an opcode that is not
                       supported by this device.

                       This counter is a 64 bit version of
                       dot3ControlInUnknownOpcodes.  It should be used
                       on interfaces operating at 10 Gb/s or faster.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.3.5,
                       aUnsupportedOpcodesReceived"
           ::= { dot3ControlEntry 3 }

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       dot3PauseTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF Dot3PauseEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION "A table of descriptive and status information
                       about the MAC Control PAUSE function on the
                       ethernet-like interfaces attached to a
                       particular system. There will be one row in
                       this table for each ethernet-like interface in
                       the system which supports the MAC Control PAUSE
                       function (i.e., the 'pause' bit in the
                       corresponding instance of
                       dot3ControlFunctionsSupported is set).  If some,
                       but not all, of the ethernet-like interfaces in
                       the system implement the MAC Control PAUSE
                       function (for example, if some interfaces only
                       support half-duplex), there will be fewer rows
                       in this table than in the dot3StatsTable."
           ::= { dot3 10 }

       dot3PauseEntry OBJECT-TYPE
           SYNTAX      Dot3PauseEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION "An entry in the table, containing information
                       about the MAC Control PAUSE function on a single
                       ethernet-like interface."
           INDEX       { dot3StatsIndex }
           ::= { dot3PauseTable 1 }

       Dot3PauseEntry ::=

           SEQUENCE {
               dot3PauseAdminMode                  INTEGER,
               dot3PauseOperMode                   INTEGER,
               dot3InPauseFrames                   Counter32,
               dot3OutPauseFrames                  Counter32,
               dot3HCInPauseFrames                 Counter64,
               dot3HCOutPauseFrames                Counter64
           }

       dot3PauseAdminMode OBJECT-TYPE
           SYNTAX      INTEGER {
                           disabled(1),
                           enabledXmit(2),
                           enabledRcv(3),
                           enabledXmitAndRcv(4)
                       }

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           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION "This object is used to configure the default
                       administrative PAUSE mode for this interface.

                       This object represents the
                       administratively-configured PAUSE mode for this
                       interface.  If auto-negotiation is not enabled
                       or is not implemented for the active MAU
                       attached to this interface, the value of this
                       object determines the operational PAUSE mode
                       of the interface whenever it is operating in
                       full-duplex mode.  In this case, a set to this
                       object will force the interface into the
                       specified mode.

                       If auto-negotiation is implemented and enabled
                       for the MAU attached to this interface, the
                       PAUSE mode for this interface is determined by
                       auto-negotiation, and the value of this object
                       denotes the mode to which the interface will
                       automatically revert if/when auto-negotiation is
                       later disabled.  Note that when auto-negotiation
                       is running, administrative control of the PAUSE
                       mode may be accomplished using the
                       ifMauAutoNegCapAdvertisedBits object in the
                       MAU-MIB.

                       Note that the value of this object is ignored
                       when the interface is not operating in
                       full-duplex mode.

                       An attempt to set this object to
                       'enabledXmit(2)' or 'enabledRcv(3)' will fail
                       on interfaces that do not support operation
                       at greater than 100 Mb/s."
           ::= { dot3PauseEntry 1 }

       dot3PauseOperMode OBJECT-TYPE
           SYNTAX      INTEGER {
                           disabled(1),
                           enabledXmit(2),
                           enabledRcv(3),
                           enabledXmitAndRcv(4)
                       }
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "This object reflects the PAUSE mode currently

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                       in use on this interface, as determined by
                       either (1) the result of the auto-negotiation
                       function or (2) if auto-negotiation is not
                       enabled or is not implemented for the active MAU
                       attached to this interface, by the value of
                       dot3PauseAdminMode.  Interfaces operating at
                       100 Mb/s or less will never return
                       'enabledXmit(2)' or 'enabledRcv(3)'.  Interfaces
                       operating in half-duplex mode will always return
                       'disabled(1)'.  Interfaces on which
                       auto-negotiation is enabled but not yet
                       completed should return the value
                       'disabled(1)'."
           ::= { dot3PauseEntry 2 }

       dot3InPauseFrames OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of MAC Control frames received on this
                       interface with an opcode indicating the PAUSE
                       operation.

                       This counter does not increment when the
                       interface is operating in half-duplex mode.

                       For interfaces operating at 10 Gb/s, this
                       counter can roll over in less than 5 minutes if
                       it is incrementing at its maximum rate.  Since
                       that amount of time could be less than a
                       management station's poll cycle time, in order
                       to avoid a loss of information, a management
                       station is advised to poll the
                       dot3HCInPauseFrames object for 10 Gb/s or
                       faster interfaces.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.4.3,
                       aPAUSEMACCtrlFramesReceived."
           ::= { dot3PauseEntry 3 }

       dot3OutPauseFrames OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current

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           DESCRIPTION "A count of MAC Control frames transmitted on
                       this interface with an opcode indicating the
                       PAUSE operation.

                       This counter does not increment when the
                       interface is operating in half-duplex mode.

                       For interfaces operating at 10 Gb/s, this
                       counter can roll over in less than 5 minutes if
                       it is incrementing at its maximum rate.  Since
                       that amount of time could be less than a
                       management station's poll cycle time, in order
                       to avoid a loss of information, a management
                       station is advised to poll the
                       dot3HCOutPauseFrames object for 10 Gb/s or
                       faster interfaces.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.4.2,
                       aPAUSEMACCtrlFramesTransmitted."
           ::= { dot3PauseEntry 4 }

       dot3HCInPauseFrames OBJECT-TYPE
           SYNTAX      Counter64
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of MAC Control frames received on this
                       interface with an opcode indicating the PAUSE
                       operation.

                       This counter does not increment when the
                       interface is operating in half-duplex mode.

                       This counter is a 64 bit version of
                       dot3InPauseFrames.  It should be used on
                       interfaces operating at 10 Gb/s or faster.

                       Discontinuities in the value of this counter can
                       occur at re-initialization of the management
                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.4.3,
                       aPAUSEMACCtrlFramesReceived."
           ::= { dot3PauseEntry 5 }


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