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Versions: 00 01 02 RFC 3635

Ethernet Interfaces and Hub MIB Working Group    Editor of this version:
INTERNET DRAFT                                                  J. Flick
                                                 Hewlett-Packard Company

                                           Editors of previous versions:
                                                                J. Flick
                                                 Hewlett-Packard Company
                                                              J. Johnson
                                                        RedBack Networks
                                                           F. Kastenholz
                                                      Unisphere Networks
                                                                May 2002

                   Definitions of Managed Objects for
                   the Ethernet-like Interface Types

               <draft-ietf-hubmib-etherif-mib-v3-02.txt>


Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet- Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.


Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   This memo defines a portion of the Management Information Base (MIB)



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   for use with network management protocols in the Internet community.
   This memo obsoletes RFC 2665 ''Definitions of Managed Objects for the
   Ethernet-like Interface Types''.  This memo updates that
   specification by including management information useful for the
   management of 10 Gigabit per second (Gb/s) Ethernet interfaces.

   Ethernet technology, as defined by the 802.3 Working Group of the
   IEEE, continues to evolve, with scalable increases in speed, new
   types of cabling and interfaces, and new features.  This evolution
   may require changes in the managed objects in order to reflect this
   new functionality.  This document, as with other documents issued by
   this working group, reflects a certain stage in the evolution of
   Ethernet technology.  In the future, this document might be revised,
   or new documents might be issued by the Ethernet Interfaces and Hub
   MIB Working Group, in order to reflect the evolution of Ethernet
   technology.

   Distribution of this memo is unlimited.  Please forward comments to
   hubmib@ietf.org.


Table of Contents

   1. Introduction ................................................    3
   2.  The SNMP Management Framework ..............................    3
   3.  Overview ...................................................    4
   3.1.  Relation to MIB-2 ........................................    5
   3.2.  Relation to the Interfaces MIB ...........................    5
   3.2.1.  Layering Model .........................................    5
   3.2.2.  Virtual Circuits .......................................    6
   3.2.3.  ifRcvAddressTable ......................................    6
   3.2.4.  ifType .................................................    6
   3.2.5.  ifXxxOctets ............................................    7
   3.2.6.  ifXxxXcastPkts .........................................    8
   3.2.7.  ifMtu ..................................................    9
   3.2.8.  ifSpeed and ifHighSpeed ................................   10
   3.2.9.  ifPhysAddress ..........................................   10
   3.2.10.  Specific Interface MIB Objects ........................   11
   3.3.  Relation to the 802.3 MAU MIB ............................   14
   3.4.  dot3StatsEtherChipSet ....................................   14
   3.5.  Mapping of IEEE 802.3 Managed Objects ....................   15
   4.  Definitions ................................................   18
   5.  Intellectual Property ......................................   54
   6.  Acknowledgements ...........................................   55
   7.  References .................................................   56
   8.  Security Considerations ....................................   59
   9.  Author's Address ...........................................   60
   A.  Change Log .................................................   60



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   A.1.  Changes since RFC 2665 ...................................   60
   A.2.  Changes between RFC 2358 and RFC 2665 ....................   61
   A.3.  Changes between RFC 1650 and RFC 2358 ....................   62
   B.  Full Copyright Statement ...................................   63


1. Introduction

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, it defines objects for managing Ethernet-like
   interfaces.

   This memo also includes a MIB module.  This MIB module updates the
   list of managed objects specified in the earlier version of this MIB,
   RFC 2665 [RFC2665].

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].


2.  The SNMP Management Framework

   The SNMP Management Framework presently consists of five major
   components:

    o   An overall architecture, described in RFC 2571 [RFC2571].

    o   Mechanisms for describing and naming objects and events for the
        purpose of management. The first version of this Structure of
        Management Information (SMI) is called SMIv1 and described in
        STD 16, RFC 1155 [RFC1155], STD 16, RFC 1212 [RFC1212] and RFC
        1215 [RFC1215].  The second version, called SMIv2, is described
        in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and
        STD 58, RFC 2580 [RFC2580].

    o   Message protocols for transferring management information. The
        first version of the SNMP message protocol is called SNMPv1 and
        described in STD 15, RFC 1157 [RFC1157]. A second version of
        the SNMP message protocol, which is not an Internet standards
        track protocol, is called SNMPv2c and described in RFC 1901
        [RFC1901] and RFC 1906 [RFC1906]. The third version of the
        message protocol is called SNMPv3 and described in RFC 1906
        [RFC1906], RFC 2572 [RFC2572] and RFC 2574 [RFC2574].

    o   Protocol operations for accessing management information. The
        first set of protocol operations and associated PDU formats is



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        described in STD 15, RFC 1157 [RFC1157].  A second set of
        protocol operations and associated PDU formats is described in
        RFC 1905 [RFC1905].

    o   A set of fundamental applications described in RFC 2573
        [RFC2573] and the view-based access control mechanism described
        in RFC 2575 [RFC2575].

   A more detailed introduction to the current SNMP Management Framework
   can be found in RFC 2570 [RFC2570].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using the mechanisms defined in the SMI.

   This memo specifies a MIB module that is compliant to the SMIv2. A
   MIB conforming to the SMIv1 can be produced through the appropriate
   translations. The resulting translated MIB must be semantically
   equivalent, except where objects or events are omitted because no
   translation is possible (use of Counter64). Some machine readable
   information in SMIv2 will be converted into textual descriptions in
   SMIv1 during the translation process. However, this loss of machine
   readable information is not considered to change the semantics of the
   MIB.


3.  Overview

   Instances of these object types represent attributes of an interface
   to an ethernet-like communications medium.  At present, ethernet-like
   media are identified by the value ethernetCsmacd(6) of the ifType
   object in the Interfaces MIB [RFC2863].  Some older implementations
   may return the values iso88023Csmacd(7) or starLan(11) for ifType for
   ethernet-like media.

   The definitions presented here are based on Section 30, "10 Mb/s, 100
   Mb/s 1000 Mb/s and 10 Gb/s Management", and Annex 30A, "GDMO
   Specification for 802.3 managed object classes" of IEEE Std. 802.3,
   2000 Edition [IEEE802.3], amended by IEEE Draft P802.3ae/D4.3
   [P802.3ae], as originally interpreted by Frank Kastenholz, then of
   Interlan in [KASTEN].  Implementors of these MIB objects should note
   that IEEE Std. 802.3 [IEEE802.3] explicitly describes (in the form of
   Pascal pseudocode) when, where, and how various MAC attributes are
   measured. The IEEE document also describes the effects of MAC actions
   that may be invoked by manipulating instances of the MIB objects
   defined here.

   To the extent that some of the attributes defined in [IEEE802.3] are



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   represented by previously defined objects in MIB-2 [RFC1213] or in
   the Interfaces MIB [RFC2863], such attributes are not redundantly
   represented by objects defined in this memo.  Among the attributes
   represented by objects defined in other memos are the number of
   octets transmitted or received on a particular interface, the number
   of frames transmitted or received on a particular interface, the
   promiscuous status of an interface, the MAC address of an interface,
   and multicast information associated with an interface.


3.1.  Relation to MIB-2

   This section applies only when this MIB is used in conjunction with
   the "old" [RFC1213] interface group.

   The relationship between an ethernet-like interface and an interface
   in the context of MIB-2 is one-to-one.  As such, the value of an
   ifIndex object instance can be directly used to identify
   corresponding instances of the objects defined herein.

   For agents which implement the (now deprecated) ifSpecific object, an
   instance of that object that is associated with an ethernet-like
   interface has the OBJECT IDENTIFIER value:

         dot3    OBJECT IDENTIFER ::= { transmission 7 }



3.2.  Relation to the Interfaces MIB

   The Interface MIB [RFC2863] requires that any MIB which is an adjunct
   of the Interface MIB clarify specific areas within the Interface MIB.
   These areas were intentionally left vague in the Interface MIB to
   avoid over constraining the MIB, thereby precluding management of
   certain media-types.

   Section 4 of [RFC2863] enumerates several areas which a media-
   specific MIB must clarify.  Each of these areas is addressed in a
   following subsection.  The implementor is referred to [RFC2863] in
   order to understand the general intent of these areas.


3.2.1.  Layering Model

   Ordinarily, there are no sublayers for an ethernet-like interface.
   However there may be implementation-specific requirements which
   require the use of sublayers.  One example is the use of 802.3 link
   aggregation.  In this case, Annex 30C of [IEEE802.3] describes the



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   layering model and the use of the ifStackTable for representing
   aggregated links.  Another example is the use of the 802.3 WAN
   Interface Sublayer.  In this case, The 802.3 WIS MIB [ETHERWIS]
   describes the layering model and the use of the ifStackTable for
   representing the WAN sublayer.


3.2.2.  Virtual Circuits

   This medium does not support virtual circuits and this area is not
   applicable to this MIB.


3.2.3.  ifRcvAddressTable

   This table contains all IEEE 802.3 addresses, unicast, multicast, and
   broadcast, for which this interface will receive packets and forward
   them up to a higher layer entity for local consumption.  The format
   of the address, contained in ifRcvAddressAddress, is the same as for
   ifPhysAddress.

   In the event that the interface is part of a MAC bridge, this table
   does not include unicast addresses which are accepted for possible
   forwarding out some other port.  This table is explicitly not
   intended to provide a bridge address filtering mechanism.


3.2.4.  ifType

   This MIB applies to interfaces which have the ifType value
   ethernetCsmacd(6).  It is REQUIRED that all ethernet-like interfaces
   use an ifType of ethernetCsmacd(6) regardless of the speed that the
   interface is running or the link-layer encapsulation in use.  Use of
   the ifType values iso88023Csmacd(7) and starLan(11) are deprecated,
   however some older implementations may return these values.
   Management applications should be prepared to receive these
   deprecated ifType values from older implementations.

   There are three other interface types defined in the IANAifType-MIB
   for Ethernet.  They are fastEther(62), fastEtherFX(69), and
   gigabitEthernet(117).  These interface types were registered by
   individual vendors, not by any IETF working group.  A requirement for
   compliance with this document is that all ethernet-like interfaces
   MUST return ethernetCsmacd(6) for ifType, and MUST NOT return
   fastEther(62), fastEtherFX(69), or gigabitEthernet(117).  However, as
   there are fielded implementations that do return these obsolete
   ifType values, management applications SHOULD be prepared to receive
   them from older implementations.



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   Information on the particular flavor of Ethernet that an interface is
   running is available from ifSpeed in the Interfaces MIB, and
   ifMauType in the 802.3 MAU MIB [MAU-MIB].  Note that implementation
   of the 802.3 MAU MIB [MAU-MIB] is REQUIRED for all ethernet-like
   interfaces.


3.2.5.  ifXxxOctets

   The Interface MIB octet counters, ifInOctets, ifOutOctets,
   ifHCInOctets and ifHCOutOctets, MUST include all octets in valid
   frames sent or received on the interface, including the MAC header
   and FCS, but not the preamble, start of frame delimiter, or extension
   octets.  This corresponds to the definition of frameSize/8 in section
   4.2.7.1 of [IEEE802.3] (frameSize is defined in bits rather than
   octets, and is defined as 2 x addressSize + lengthOrTypeSize +
   dataSize + crcSize).  They do not include the number of octets in
   collided or failed transmit attempts, since the MAC layer driver
   typically does not have visibility to count these octets.  They also
   do not include octets in received invalid frames, since this
   information is normally not passed to the MAC layer, and since non-
   promiscuous MAC implementations cannot reliably determine whether an
   invalid frame was actually addressed to this station.

   Note that these counters do include octets in valid MAC control
   frames sent or received on the interface, as well as octets in
   otherwise valid received MAC frames that are discarded by the MAC
   layer for some reason (insufficient buffer space, unknown protocol,
   etc.).

   Note that the octet counters in IF-MIB do not exactly match the
   definition of the octet counters in IEEE 802.3.  aOctetsTransmittedOK
   and aOctetsReceivedOK count only the octets in the clientData and Pad
   fields, whereas ifInOctets and ifOutOctets include the entire MAC
   frame, including MAC header and FCS.  However, the IF-MIB counters
   can be derived from the IEEE 802.3 counters as follows:

     ifInOctets = aOctetsReceivedOK + (18 * aFramesReceivedOK)
     ifOutOctets = aOctetsTransmittedOK + (18 * aFramesTransmittedOK)

   Another difference to keep in mind between the IF-MIB counters and
   IEEE 802.3 counters is that in the IEEE 802.3 document, the frame
   counters and octet counters are always incremented together.
   aOctetsTransmittedOK counts the number of octets in frames that were
   counted by aFramesTransmittedOK.  aOctetsReceivedOK counts the number
   of octets in frames that were counted by aFramesReceivedOK.  This is
   not the case with the IF-MIB counters.  The IF-MIB octet counters
   count the number of octets sent to or received from the layer below



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   this interface, whereas the packet counters count the number of
   packets sent to or received from the layer above.  Therefore,
   received MAC Control frames, ifInDiscards, and ifInUnknownProtos are
   counted by ifInOctets, but not ifInXcastPkts.  Transmitted MAC
   Control frames are counted by ifOutOctets, but not ifOutXcastPkts.
   ifOutDiscards and ifOutErrors are counted by ifOutXcastPkts, but not
   ifOutOctets.


3.2.6.  ifXxxXcastPkts

   The packet counters in the IF-MIB do not exactly match the definition
   of the frame counters in IEEE 802.3.  aFramesTransmittedOK counts the
   number of frames successfully transmitted on the interface, whereas
   ifOutUcastPkts, ifOutMulticastPkts and ifOutBroadcastPkts count the
   number of transmit requests made from a higher layer, whether or not
   the transmit attempt was successful.  This means that packets counted
   by ifOutErrors or ifOutDiscards are also be counted by
   ifOutXcastPkts, but are not be counted by aFramesTransmittedOK.  This
   also means that, since MAC Control frames are generated by a sublayer
   internal to the interface layer rather than by a higher layer, they
   are not counted by ifOutXcastPkts, but are counted by
   aFramesTransmittedOK.  Roughly:

     aFramesTransmittedOK = ifOutUcastPkts + ifOutMulticastPkts +
                            ifOutBroadcastPkts + dot3OutPauseFrames -
                            (ifOutErrors + ifOutDiscards)

   Similarly, aFramesReceivedOK counts the number of frames received
   successfully by the interface, whether or not they are passed to a
   higher layer, whereas ifInUcastPkts, ifInMulticastPkts and
   ifInBroadcastPkts count only the number of packets passed to a higher
   layer.  This means that packets counted by ifInDiscards or
   ifInUnknownProtos are also counted by aFramesReceivedOK, but are not
   counted by ifInXcastPkts.  This also means that, since MAC Control
   frames are consumed by a sublayer internal to the interface layer and
   not passed to a higher layer, they are not counted by ifInXcastPkts,
   but are counted by aFramesReceivedOK.  Roughly:

     aFramesReceivedOK = ifInUcastPkts + ifInMulticastPkts +
                         ifInBroadcastPkts + dot3InPauseFrames +
                         ifInDiscards + ifInUnknownProtos

   This specification chooses to treat MAC control frames as being
   originated and consumed within the interface and not counted by the
   IF-MIB packet counters.  MAC control frames are normally sent as
   multicast packets.  In many network environments, MAC control frames
   can greatly outnumber multicast frames carrying actual data.  If MAC



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   control frames were included in the ifInMulticastPkts and
   ifOutMulticastPkts, the count of data-carrying multicast packets
   would tend to be drowned out by the count of MAC control frames,
   rendering those counters considerably less useful.

   To better understand the issues surrounding the mapping of of the
   IF-MIB packet and octet counters to an Ethernet interface, it is
   useful to refer to a Case Diagram [CASE] for the IF-MIB counters,
   with modifications to show the proper interpretation for the Ethernet
   interface layer.

                               layer above
   --------------------------------------------------------------------
       ifInUcastPkts+         ^           |     ifOutUcastPkts+
       ifInBroadcastPkts+ ----|----   ----|---- ifOutBroadcastPkts+
       ifInMulticastPkts      |           |     ifOutMulticastPkts
                              |           |
        dot3InPauseFrames <---|           |<--- dot3OutPauseFrames
                              |           |
             ifInDiscards <---|           |
                              |           |
        ifInUnknownProtos <---|           |---> ifOutDiscards
                              |           |
               ifInOctets ----|----   ----|---- ifOutOctets
                              |           |
               ifInErrors <---|           |---> ifOutErrors
                              |           V
   --------------------------------------------------------------------
                               layer below

3.2.7.  ifMtu

   The defined standard MTU for ethernet-like interfaces is 1500 octets.
   However, many implementations today support larger packet sizes than
   the IEEE 802.3 standard.  The value of this object MUST reflect the
   actual MTU in use on the interface, whether it matches the standard
   MTU or not.

   This value should reflect the value seen by the MAC client interface.
   When a higher layer protocol, like IP, is running over Ethernet
   framing, this is the MTU that will be seen by that higher layer
   protocol.  However, most ethernet-like interfaces today run multiple
   protocols that use a mix of different framing types.  For example, an
   IEEE 802.2 LLC type 1 client protocol will see an MTU of 1497 octets
   on an interface using the IEEE standard maximum packet size, and a
   protocol running over SNAP will see an MTU of 1492 octets on an
   interface using the IEEE standard maximum packet size.  However,
   since specification mandates using the MTU as seen at the MAC client



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   interface, the value of ifMtu would be reported as 1500 octets in
   these cases.


3.2.8.  ifSpeed and ifHighSpeed

   For ethernet-like interfaces operating at 1000 Megabits per second
   (Mb/s) or less, ifSpeed will represent the current operational speed
   of the interface in bits per second.  For current interface types,
   this will be equal to 1,000,000 (1 million), 10,000,000 (10 million),
   100,000,000 (100 million), or 1,000,000,000 (1 billion).  ifHighSpeed
   will represent the current operational speed in millions of bits per
   second.  For current ethernet-like interfaces, this will be equal to
   1, 10, 100, or 1,000. If the interface implements auto-negotiation,
   auto-negotiation is enabled for this interface, and the interface has
   not yet negotiated to an operational speed, these objects SHOULD
   reflect the maximum speed supported by the interface.

   For ethernet-like interfaces operating at greater than 1000 Mb/s,
   ifHighSpeed will represent the current operational speed of the
   interface in millions of bits per second.  Note that for WAN
   implementations, this will be the payload data rate over the WAN
   interface sublayer.  For current implementations, this will be equal
   to 10,000 for LAN implentations of 10 Gb/s, and 9,294 for WAN
   implementations of the 10 Gb/s MAC over an OC-192 PHY.  For these
   speeds, ifSpeed should report a maximum unsigned 32-bit value of
   4,294,967,295 as specified in [RFC2863].

   Note that these object MUST NOT indicate a doubled value when
   operating in full-duplex mode.  It MUST indicate the correct line
   speed regardless of the current duplex mode.  The duplex mode of the
   interface may be determined by examining either the
   dot3StatsDuplexStatus object in this MIB module, or the ifMauType
   object in the 802.3 MAU MIB [MAU-MIB].


3.2.9.  ifPhysAddress

   This object contains the IEEE 802.3 address which is placed in the
   source-address field of any Ethernet, Starlan, or IEEE 802.3 frames
   that originate at this interface.  Usually this will be kept in ROM
   on the interface hardware.  Some systems may set this address via
   software.

   In a system where there are several such addresses the designer has a
   tougher choice.  The address chosen should be the one most likely to
   be of use to network management (e.g.  the address placed in ARP
   responses for systems which are primarily IP systems).



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   If the designer truly can not chose, use of the factory- provided ROM
   address is suggested.

   If the address can not be determined, an octet string of zero length
   should be returned.

   The address is stored in binary in this object.  The address is
   stored in "canonical" bit order, that is, the Group Bit is positioned
   as the low-order bit of the first octet.  Thus, the first byte of a
   multicast address would have the bit 0x01 set.



3.2.10.  Specific Interface MIB Objects

   The following table provides specific implementation guidelines for
   applying the interface group objects to ethernet-like media.

     Object                     Guidelines

     ifIndex                    Each ethernet-like interface is
                                represented by an ifEntry.  The
                                dot3StatsTable in this MIB module is
                                indexed by dot3StatsIndex. The interface
                                identified by a particular value of
                                dot3StatsIndex is the same interface as
                                identified by the same value of ifIndex.

     ifDescr                    Refer to [RFC2863].

     ifType                     Refer to section 3.2.4.

     ifMtu                      Refer to section 3.2.7.

     ifSpeed                    Refer to section 3.2.8.

     ifPhysAddress              Refer to section 3.2.9.

     ifAdminStatus              Write access is not required.  Support
                                for 'testing' is not required.

     ifOperStatus               The operational state of the interface.
                                Support for 'testing' is not required.
                                The value 'dormant' has no meaning for
                                an ethernet-like interface.

     ifLastChange               Refer to [RFC2863].




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     ifInOctets                 The number of octets in valid MAC frames
                                received on this interface, including
                                the MAC header and FCS.  This does
                                include the number of octets in valid
                                MAC Control frames received on this
                                interface.  See section 3.2.5.

     ifInUcastPkts              Refer to [RFC2863].  Note that this does
                                not include MAC Control frames, since
                                MAC Control frames are consumed by the
                                interface layer and are not passed to
                                any higher layer protocol.  See
                                section 3.2.6.

     ifInDiscards               Refer to [RFC2863].

     ifInErrors                 The sum for this interface of
                                dot3StatsAlignmentErrors,
                                dot3StatsFCSErrors,
                                dot3StatsFrameTooLongs,
                                and dot3StatsInternalMacReceiveErrors.

     ifInUnknownProtos          Refer to [RFC2863].

     ifOutOctets                The number of octets transmitted in
                                valid MAC frames on this interface,
                                including the MAC header and FCS.  This
                                does include the number of octets in
                                valid MAC Control frames transmitted on
                                this interface.  See section 3.2.5.

     ifOutUcastPkts             Refer to [RFC2863].  Note that this does
                                not include MAC Control frames, since
                                MAC Control frames are generated by the
                                interface layer, and are not passed from
                                any higher layer protocol.  See section
                                3.2.6.

     ifOutDiscards              Refer to [RFC2863].

     ifOutErrors                The sum for this interface of:
                                dot3StatsSQETestErrors,
                                dot3StatsLateCollisions,
                                dot3StatsExcessiveCollisions,
                                dot3StatsInternalMacTransmitErrors and
                                dot3StatsCarrierSenseErrors.

     ifName                     Locally-significant textual name for the



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                                interface (e.g. lan0).

     ifInMulticastPkts          Refer to [RFC2863].  Note that this does
                                not include MAC Control frames, since
                                MAC Control frames are consumed by the
                                interface layer and are not passed to
                                any higher layer protocol.  See section
                                3.2.6.

     ifInBroadcastPkts          Refer to [RFC2863].  Note that this does
                                not include MAC Control frames, since
                                MAC Control frames are generated by the
                                interface layer, and are not passed from
                                any higher layer protocol.  See section
                                3.2.6.

     ifOutMulticastPkts         Refer to [RFC2863].  Note that this does
                                not include MAC Control frames, since
                                MAC Control frames are consumed by the
                                interface layer and are not passed to
                                any higher layer protocol.  See section
                                3.2.6.

     ifOutBroadcastPkts         Refer to [RFC2863].  Note that this does
                                not include MAC Control frames, since
                                MAC Control frames are generated by the
                                interface layer, and are not passed from
                                any higher layer protocol.  See section
                                3.2.6.

     ifHCInOctets               64-bit versions of counters.  Required
     ifHCOutOctets              for ethernet-like interfaces that are
                                capable of operating at 20 Mb/s or
                                faster, even if the interface is
                                currently operating at less than
                                20 Mb/s.

     ifHCInUcastPkts            64-bit versions of packet counters.
     ifHCInMulticastPkts        Required for ethernet-like interfaces
     ifHCInBroadcastPkts        that are capable of operating at
     ifHCOutUcastPkts           640 Mb/s or faster, even if the
     ifHCOutMulticastPkts       interface is currently operating at
     ifHCOutBroadcastPkts       less than 640 Mb/s.

     ifLinkUpDownTrapEnable     Refer to [RFC2863].  Default is
                                'enabled'

     ifHighSpeed                Refer to section 3.2.8.



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     ifPromiscuousMode          Refer to [RFC2863].

     ifConnectorPresent         This will normally be 'true'. It will
                                be 'false' in the case where this
                                interface uses the WAN Interface
                                Sublayer.  See [ETHERWIS] for details.

     ifAlias                    Refer to [RFC2863].

     ifCounterDiscontinuityTime Refer to [RFC2863].  Note that a
                                discontinuity in the Interface MIB
                                counters may also indicate a
                                discontinuity in some or all of the
                                counters in this MIB that are associated
                                with that interface.

     ifStackHigherLayer         Refer to section 3.2.1.
     ifStackLowerLayer
     ifStackStatus

     ifRcvAddressAddress        Refer to section 3.2.3.
     ifRcvAddressStatus
     ifRcvAddressType


3.3.  Relation to the 802.3 MAU MIB

   Support for the mauModIfCompl3 compliance statement of the MAU-MIB
   [MAU-MIB] is REQUIRED for Ethernet-like interfaces.  This MIB is
   needed in order to allow applications to determine the current MAU
   type in use by the interface, and to control autonegotiation and
   duplex mode for the interface.  Implementing this MIB module without
   implementing the MAU-MIB would leave applications with no standard
   way to determine the media type in use, and no standard way to
   control the duplex mode of the interface.


3.4.  dot3StatsEtherChipSet

   This document defines an object called dot3StatsEtherChipSet, which
   is used to identify the MAC hardware used to communicate on an
   interface.  Previous versions of this document contained a number of
   OID assignments for some existing Ethernet chipsets.  Maintaining
   that list as part of this document has proven to be problematic, so
   the OID assignments contained in prevous versions of this document
   have now been moved to a separate document [RFC2666].

   The dot3StatsEtherChipSet object has now been deprecated.



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   Implementation feedback indicates that this object is much more
   useful in theory than in practice.  The object's utility in debugging
   network problems in the field appears to be limited.  In those cases
   where it may be useful, it is not sufficient, since it identifies
   only the MAC chip, and not the PHY, PMD, or driver.  The
   administrative overhead involved in maintaining a central registry of
   chipset OIDs cannot be justified for an object whose usefulness is
   questionable at best.

   Implementations which continue to support this object for the purpose
   of backwards compatability may continue to use the values defined in
   [RFC2666].  For chipsets not listed in [RFC2666], implementors that
   wish to support this object and return a valid OBJECT IDENTIFIER
   value may assign OBJECT IDENTIFIERS within that part of the
   registration tree delegated to individual enterprises.


3.5.  Mapping of IEEE 802.3 Managed Objects

   IEEE 802.3 Managed Object         Corresponding SNMP Object

   oMacEntity
    .aMACID                          dot3StatsIndex or
                                     IF-MIB - ifIndex
    .aFramesTransmittedOK            IF-MIB - ifOutUCastPkts +
                                              ifOutMulticastPkts +
                                              ifOutBroadcastPkts*
    .aSingleCollisionFrames          dot3StatsSingleCollisionFrames
    .aMultipleCollisionFrames        dot3StatsMultipleCollisionFrames
    .aFramesReceivedOK               IF-MIB - ifInUcastPkts +
                                              ifInMulticastPkts +
                                              ifInBroadcastPkts*
    .aFrameCheckSequenceErrors       dot3StatsFCSErrors
    .aAlignmentErrors                dot3StatsAlignmentErrors
    .aOctetsTransmittedOK            IF-MIB - ifOutOctets*
    .aFramesWithDeferredXmissions    dot3StatsDeferredTransmissions
    .aLateCollisions                 dot3StatsLateCollisions
    .aFramesAbortedDueToXSColls      dot3StatsExcessiveCollisions
    .aFramesLostDueToIntMACXmitError dot3StatsInternalMacTransmitErrors
    .aCarrierSenseErrors             dot3StatsCarrierSenseErrors
    .aOctetsReceivedOK               IF-MIB - ifInOctets*
    .aFramesLostDueToIntMACRcvError  dot3StatsInternalMacReceiveErrors
    .aPromiscuousStatus              IF-MIB - ifPromiscuousMode
    .aReadMulticastAddressList       IF-MIB - ifRcvAddressTable
    .aMulticastFramesXmittedOK       IF-MIB - ifOutMulticastPkts*
    .aBroadcastFramesXmittedOK       IF-MIB - ifOutBroadcastPkts*
    .aMulticastFramesReceivedOK      IF-MIB - ifInMulticastPkts*
    .aBroadcastFramesReceivedOK      IF-MIB - ifInBroadcastPkts*



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    .aFrameTooLongErrors             dot3StatsFrameTooLongs
    .aReadWriteMACAddress            IF-MIB - ifPhysAddress
    .aCollisionFrames                dot3CollFrequencies
    .aDuplexStatus                   dot3StatsDuplexStatus
    .aRateControlAbility             dot3StatsRateControlAbility
    .aRateControlStatus              dot3StatsRateControlStatus
    .acAddGroupAddress               IF-MIB - ifRcvAddressTable
    .acDeleteGroupAddress            IF-MIB - ifRcvAddressTable
    .acExecuteSelfTest               dot3TestLoopBack

   oPHYEntity
    .aPHYID                          dot3StatsIndex or
                                     IF-MIB - ifIndex
    .aSQETestErrors                  dot3StatsSQETestErrors
    .aSymbolErrorDuringCarrier       dot3StatsSymbolErrors

   oMACControlEntity
    .aMACControlID                   dot3StatsIndex or
                                     IF-MIB - ifIndex
    .aMACControlFunctionsSupported   dot3ControlFunctionsSupported and
                                     dot3ControlFunctionsEnabled
    .aUnsupportedOpcodesReceived     dot3ControlInUnknownOpcodes

   oPAUSEEntity
    .aPAUSEMACCtrlFramesTransmitted  dot3OutPauseFrames
    .aPAUSEMACCtrlFramesReceived     dot3InPauseFrames


   * Note that the octet counters in IF-MIB do not exactly match the
   definition of the octet counters in IEEE 802.3.  See section 3.2.5
   for details.

   Also note that the packet counters in the IF-MIB do not exactly match
   the definition of the frame counters in IEEE 802.3.  See section
   3.2.6 for details.

   The following IEEE 802.3 managed objects have been removed from this
   MIB module as a result of implementation feedback:

   oMacEntity
     .aFramesWithExcessiveDeferral
     .aInRangeLengthErrors
     .aOutOfRangeLengthField
     .aMACEnableStatus
     .aTransmitEnableStatus
     .aMulticastReceiveStatus
     .acInitializeMAC




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   Please see [RFC1369] for the detailed reasoning on why these objects
   were removed.

   In addition, the following IEEE 802.3 managed objects have not been
   included in this MIB for the following reasons.

   IEEE 802.3 Managed Object         Disposition

   oMACEntity
    .aMACCapabilities                Can be derived from
                                     MAU-MIB - ifMauTypeListBits

     .aStretchRatio                  Implementation constant.

   oPHYEntity
    .aPhyType                        Can be derived from
                                     MAU-MIB - ifMauType

    .aPhyTypeList                    Can be derived from
                                     MAU-MIB - ifMauTypeListBits

    .aMIIDetect                      Not considered useful.

    .aPhyAdminState                  Can already obtain interface
                                     state from IF-MIB - ifAdminStatus
                                     and MAU state from MAU-MIB -
                                     ifMauStatus.  Providing an
                                     additional state for the PHY
                                     was not considered useful.

    .acPhyAdminControl               Can already control interface
                                     state from IF-MIB - ifAdminStatus
                                     and MAU state from MAU-MIB -
                                     ifMauStatus.  Providing separate
                                     admin control of the PHY was not
                                     considered useful.

   oMACControlEntity
    .aMACControlFramesTransmitted    Can be determined by summing the
                                     OutFrames counters for the
                                     individual control functions

    .aMACControlFramesReceived       Can be determined by summing the
                                     InFrames counters for the
                                     individual control functions

   oPAUSEEntity
    .aPAUSELinkDelayAllowance        Not considered useful.



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4.  Definitions

   EtherLike-MIB DEFINITIONS ::= BEGIN

       IMPORTS
           MODULE-IDENTITY, OBJECT-TYPE, OBJECT-IDENTITY,
           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 "200205100000Z"  -- May 10, 2002
           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, 2000 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 Draft P802.3ae/D4.3:
                          'Supplement to Carrier Sense Multiple Access
                          with Collision Detection (CSMA/CD) Access
                          Method & Physical Layer Specifications -
                          Media Access Control (MAC) Parameters,
                          Physical Layer, and Management Parameters
                          for 10 Gb/s Operation', April, 2002.

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

           REVISION    "200205100000Z"  -- May 10, 2002
           DESCRIPTION "Updated to include support for 10 Gb/sec
                        interfaces.
                        This version published as RFC XXXX."

           REVISION    "9908240400Z"  -- August 24, 1999
           DESCRIPTION "Updated to include support for 1000 Mb/sec
                        interfaces and full-duplex interfaces.
                        This version published as RFC 2665."

           REVISION    "9806032150Z"  -- June 3, 1998
           DESCRIPTION "Updated to include support for 100 Mb/sec
                        interfaces.
                        This version published as RFC 2358."

           REVISION    "9402030400Z"  -- 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



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                       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 {
               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
           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 }




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       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
                       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.




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                       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
                       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



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                       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
                       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



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                       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
           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



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                       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
           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



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                       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
                       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."



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           ::= { 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,
                       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



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                       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
                       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.



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                       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."
           ::= { 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



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                       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
                       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



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                       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 }

       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



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           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
                       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        INTEGER,
               dot3CollFrequencies  Counter32
           }

       -- { dot3CollEntry 1 } is no longer in use

       dot3CollCount OBJECT-TYPE
           SYNTAX      INTEGER (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



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                       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
                       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 {



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               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."
           ::= { 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



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                       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 }

       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,



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               dot3PauseOperMode                   INTEGER,
               dot3InPauseFrames                   Counter32,
               dot3OutPauseFrames                  Counter32,
               dot3HCInPauseFrames                 Counter64,
               dot3HCOutPauseFrames                Counter64
           }

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



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                       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
                       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



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                       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
           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



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                       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 }

       dot3HCOutPauseFrames OBJECT-TYPE
           SYNTAX      Counter64
           MAX-ACCESS  read-only
           STATUS      current
           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.

                       This counter is a 64 bit version of
                       dot3OutPauseFrames.  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.], 30.3.4.2,
                       aPAUSEMACCtrlFramesTransmitted."
           ::= { dot3PauseEntry 6 }


       dot3HCStatsTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF Dot3HCStatsEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION "A table containing 64-bit versions of error
                       counters from the dot3StatsTable.  The 32-bit
                       versions of these counters may roll over quite
                       quickly on higher speed ethernet interfaces.
                       The counters that have 64-bit versions in this
                       table are the counters that apply to full-duplex



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                       interfaces, since 10 Gb/s and faster
                       ethernet-like interfaces do not support
                       half-duplex, and very few 1000 Mb/s
                       ethernet-like interfaces support half-duplex.

                       Entries in this table are recommended for
                       interfaces capable of operating at 1000 Mb/s or
                       faster, and are required for interfaces capable
                       of operating at 10 Gb/s or faster.  Lower speed
                       ethernet-like interfaces do not need entries in
                       this table, in which case there may be fewer
                       entries in this table than in the
                       dot3StatsTable. However, implementations
                       containing interfaces with a mix of speeds may
                       choose to implement entries in this table for
                       all ethernet-like interfaces."
           ::= { dot3 11 }

       dot3HCStatsEntry OBJECT-TYPE
           SYNTAX      Dot3HCStatsEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION "An entry containing 64-bit statistics for a
                       single ethernet-like interface."
           INDEX       { dot3StatsIndex }
           ::= { dot3HCStatsTable 1 }

       Dot3HCStatsEntry ::=
           SEQUENCE {
               dot3HCStatsAlignmentErrors           Counter64,
               dot3HCStatsFCSErrors                 Counter64,
               dot3HCStatsInternalMacTransmitErrors Counter64,
               dot3HCStatsFrameTooLongs             Counter64,
               dot3HCStatsInternalMacReceiveErrors  Counter64,
               dot3HCStatsSymbolErrors              Counter64
           }

       dot3HCStatsAlignmentErrors OBJECT-TYPE
           SYNTAX      Counter64
           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



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                       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.

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

                       This counter is a 64 bit version of
                       dot3StatsAlignmentErrors.  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.], 30.3.1.1.7,
                       aAlignmentErrors"
           ::= { dot3HCStatsEntry 1 }

       dot3HCStatsFCSErrors OBJECT-TYPE
           SYNTAX      Counter64
           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.

                       This counter is a 64 bit version of
                       dot3StatsFCSErrors.  It should be used on
                       interfaces operating at 10 Gb/s or faster.




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                       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."
           ::= { dot3HCStatsEntry 2 }

       dot3HCStatsInternalMacTransmitErrors OBJECT-TYPE
           SYNTAX      Counter64
           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.

                       This counter is a 64 bit version of
                       dot3StatsInternalMacTransmitErrors.  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.], 30.3.1.1.12,
                       aFramesLostDueToIntMACXmitError."
           ::= { dot3HCStatsEntry 3 }

       dot3HCStatsFrameTooLongs OBJECT-TYPE
           SYNTAX      Counter64
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION "A count of frames received on a particular
                       interface that exceed the maximum permitted
                       frame size.



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

                       This counter is a 64 bit version of
                       dot3StatsFrameTooLongs.  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.], 30.3.1.1.25,
                       aFrameTooLongErrors."
           ::= { dot3HCStatsEntry 4 }

       dot3HCStatsInternalMacReceiveErrors OBJECT-TYPE
           SYNTAX      Counter64
           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.

                       This counter is a 64 bit version of
                       dot3StatsInternalMacReceiveErrors.  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



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                       system, and at other times as indicated by the
                       value of ifCounterDiscontinuityTime."
           REFERENCE   "[IEEE 802.3 Std.], 30.3.1.1.15,
                       aFramesLostDueToIntMACRcvError."
           ::= { dot3HCStatsEntry 5 }

       dot3HCStatsSymbolErrors OBJECT-TYPE
           SYNTAX      Counter64
           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 is a 64 bit version of
                       dot3StatsSymbolErrors.  It should be used on
                       interfaces operating at 10 Gb/s or faster.



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                       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."
           ::= { dot3HCStatsEntry 6 }


       --  802.3 Tests

       dot3Tests   OBJECT IDENTIFIER ::= { dot3 6 }

       dot3Errors  OBJECT IDENTIFIER ::= { dot3 7 }


       --  TDR Test

       dot3TestTdr OBJECT-IDENTITY
           STATUS      deprecated
           DESCRIPTION "The Time-Domain Reflectometry (TDR) test is
                       specific to ethernet-like interfaces of type
                       10Base5 and 10Base2.  The TDR value may be
                       useful in determining the approximate distance
                       to a cable fault.  It is advisable to repeat
                       this test to check for a consistent resulting
                       TDR value, to verify that there is a fault.

                       A TDR test returns as its result the time
                       interval, measured in 10 MHz ticks or 100 nsec
                       units, between the start of TDR test
                       transmission and the subsequent detection of a
                       collision or deassertion of carrier.  On
                       successful completion of a TDR test, the result
                       is stored as the value of an appropriate
                       instance of an appropriate vendor specific MIB
                       object, and the OBJECT IDENTIFIER of that
                       instance is stored in the appropriate instance
                       of the appropriate test result code object
                       (thereby indicating where the result has been
                       stored)."
           ::= { dot3Tests 1 }

       -- Loopback Test

       dot3TestLoopBack OBJECT-IDENTITY
           STATUS      deprecated
           DESCRIPTION "This test configures the MAC chip and executes



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                       an internal loopback test of memory, data paths,
                       and the MAC chip logic.  This loopback test can
                       only be executed if the interface is offline.
                       Once the test has completed, the MAC chip should
                       be reinitialized for network operation, but it
                       should remain offline.

                       If an error occurs during a test, the
                       appropriate test result object will be set
                       to indicate a failure.  The two OBJECT
                       IDENTIFIER values dot3ErrorInitError and
                       dot3ErrorLoopbackError may be used to provided
                       more information as values for an appropriate
                       test result code object."
           ::= { dot3Tests 2 }

       dot3ErrorInitError OBJECT-IDENTITY
           STATUS      deprecated
           DESCRIPTION "Couldn't initialize MAC chip for test."
           ::= { dot3Errors 1 }

       dot3ErrorLoopbackError OBJECT-IDENTITY
           STATUS      deprecated
           DESCRIPTION "Expected data not received (or not received
                       correctly) in loopback test."
           ::= { dot3Errors 2 }


       -- { dot3 8 }, the dot3ChipSets tree, is defined in [31]


       -- conformance information

       etherConformance OBJECT IDENTIFIER ::= { etherMIB 2 }

       etherGroups      OBJECT IDENTIFIER ::= { etherConformance 1 }
       etherCompliances OBJECT IDENTIFIER ::= { etherConformance 2 }


       -- compliance statements

       etherCompliance MODULE-COMPLIANCE
           STATUS      deprecated
           DESCRIPTION "******** THIS COMPLIANCE IS DEPRECATED ********

                       The compliance statement for managed network
                       entities which have ethernet-like network
                       interfaces.



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                       This compliance is deprecated and replaced by
                       dot3Compliance."

           MODULE  -- this module
               MANDATORY-GROUPS { etherStatsGroup }

               GROUP       etherCollisionTableGroup
               DESCRIPTION "This group is optional. It is appropriate
                           for all systems which have the necessary
                           metering. Implementation in such systems is
                           highly recommended."
           ::= { etherCompliances 1 }

       ether100MbsCompliance MODULE-COMPLIANCE
           STATUS      deprecated
           DESCRIPTION "******** THIS COMPLIANCE IS DEPRECATED ********

                       The compliance statement for managed network
                       entities which have 100 Mb/sec ethernet-like
                       network interfaces.

                       This compliance is deprecated and replaced by
                       dot3Compliance."

           MODULE  -- this module
               MANDATORY-GROUPS { etherStats100MbsGroup }

               GROUP       etherCollisionTableGroup
               DESCRIPTION "This group is optional. It is appropriate
                           for all systems which have the necessary
                           metering. Implementation in such systems is
                           highly recommended."
           ::= { etherCompliances 2 }

       dot3Compliance MODULE-COMPLIANCE
           STATUS      deprecated
           DESCRIPTION "******** THIS COMPLIANCE IS DEPRECATED ********

                       The compliance statement for managed network
                       entities which have ethernet-like network
                       interfaces."

           MODULE  -- this module
               MANDATORY-GROUPS { etherStatsBaseGroup }

               GROUP       etherDuplexGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces which are



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                           capable of operating in full-duplex mode.
                           It is highly recommended for all
                           ethernet-like network interfaces."

               GROUP       etherStatsLowSpeedGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces which are
                           capable of operating at 10 Mb/s or slower in
                           half-duplex mode."

               GROUP       etherStatsHighSpeedGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces which are
                           capable of operating at 100 Mb/s or faster."

               GROUP       etherControlGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces that
                           support the MAC Control sublayer."

               GROUP       etherControlPauseGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces that
                           support the MAC Control PAUSE function."

               GROUP       etherCollisionTableGroup
               DESCRIPTION "This group is optional. It is appropriate
                           for all ethernet-like network interfaces
                           which are capable of operating in
                           half-duplex mode and have the necessary
                           metering. Implementation in systems with
                           such interfaces is highly recommended."
           ::= { etherCompliances 3 }

       dot3Compliance2 MODULE-COMPLIANCE
           STATUS      current
           DESCRIPTION "The compliance statement for managed network
                       entities which have ethernet-like network
                       interfaces."

           MODULE  -- this module
               MANDATORY-GROUPS { etherStatsBaseGroup2 }

               GROUP       etherDuplexGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces which are
                           capable of operating in full-duplex mode.
                           It is highly recommended for all



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                           ethernet-like network interfaces."

               GROUP       etherRateControlGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces which are
                           capable of operating at speeds faster than
                           1000 Mb/s. It is highly recommended for all
                           ethernet-like network interfaces."

               GROUP       etherStatsLowSpeedGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces which are
                           capable of operating at 10 Mb/s or slower in
                           half-duplex mode."

               GROUP       etherStatsHighSpeedGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces which are
                           capable of operating at 100 Mb/s or faster."

               GROUP       etherStatsHalfDuplexGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces which are
                           capable of operating in half-duplex mode."

               GROUP       etherHCStatsGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces which are
                           capable of operating at 10 Gb/s or faster.
                           It is recommended for all ethernet-like
                           network interfaces which are capable of
                           operating at 1000 Mb/s or faster."

               GROUP       etherControlGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces that
                           support the MAC Control sublayer."

               GROUP       etherHCControlGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces that
                           support the MAC Control sublayer and are
                           capable of operating at 10 Gb/s or faster."

               GROUP       etherControlPauseGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces that
                           support the MAC Control PAUSE function."



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               GROUP       etherHCControlPauseGroup
               DESCRIPTION "This group is mandatory for all
                           ethernet-like network interfaces that
                           support the MAC Control PAUSE function and
                           are capable of operating at 10 Gb/s or
                           faster."

               GROUP       etherCollisionTableGroup
               DESCRIPTION "This group is optional. It is appropriate
                           for all ethernet-like network interfaces
                           which are capable of operating in
                           half-duplex mode and have the necessary
                           metering. Implementation in systems with
                           such interfaces is highly recommended."
           ::= { etherCompliances 4 }

       -- units of conformance

       etherStatsGroup OBJECT-GROUP
           OBJECTS     { dot3StatsIndex,
                         dot3StatsAlignmentErrors,
                         dot3StatsFCSErrors,
                         dot3StatsSingleCollisionFrames,
                         dot3StatsMultipleCollisionFrames,
                         dot3StatsSQETestErrors,
                         dot3StatsDeferredTransmissions,
                         dot3StatsLateCollisions,
                         dot3StatsExcessiveCollisions,
                         dot3StatsInternalMacTransmitErrors,
                         dot3StatsCarrierSenseErrors,
                         dot3StatsFrameTooLongs,
                         dot3StatsInternalMacReceiveErrors,
                         dot3StatsEtherChipSet
                       }
           STATUS      deprecated
           DESCRIPTION "********* THIS GROUP IS DEPRECATED **********

                       A collection of objects providing information
                       applicable to all ethernet-like network
                       interfaces.

                       This object group has been deprecated and
                       replaced by etherStatsBaseGroup and
                       etherStatsLowSpeedGroup."
           ::= { etherGroups 1 }

       etherCollisionTableGroup OBJECT-GROUP
           OBJECTS     { dot3CollFrequencies



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                       }
           STATUS      current
           DESCRIPTION "A collection of objects providing a histogram
                       of packets successfully transmitted after
                       experiencing exactly N collisions."
           ::= { etherGroups 2 }

       etherStats100MbsGroup OBJECT-GROUP
           OBJECTS     { dot3StatsIndex,
                         dot3StatsAlignmentErrors,
                         dot3StatsFCSErrors,
                         dot3StatsSingleCollisionFrames,
                         dot3StatsMultipleCollisionFrames,
                         dot3StatsDeferredTransmissions,
                         dot3StatsLateCollisions,
                         dot3StatsExcessiveCollisions,
                         dot3StatsInternalMacTransmitErrors,
                         dot3StatsCarrierSenseErrors,
                         dot3StatsFrameTooLongs,
                         dot3StatsInternalMacReceiveErrors,
                         dot3StatsEtherChipSet,
                         dot3StatsSymbolErrors
                       }
           STATUS      deprecated
           DESCRIPTION "********* THIS GROUP IS DEPRECATED **********

                       A collection of objects providing information
                       applicable to 100 Mb/sec ethernet-like network
                       interfaces.

                       This object group has been deprecated and
                       replaced by etherStatsBaseGroup and
                       etherStatsHighSpeedGroup."
           ::= { etherGroups 3 }

       etherStatsBaseGroup OBJECT-GROUP
           OBJECTS     { dot3StatsIndex,
                         dot3StatsAlignmentErrors,
                         dot3StatsFCSErrors,
                         dot3StatsSingleCollisionFrames,
                         dot3StatsMultipleCollisionFrames,
                         dot3StatsDeferredTransmissions,
                         dot3StatsLateCollisions,
                         dot3StatsExcessiveCollisions,
                         dot3StatsInternalMacTransmitErrors,
                         dot3StatsCarrierSenseErrors,
                         dot3StatsFrameTooLongs,
                         dot3StatsInternalMacReceiveErrors



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                       }
           STATUS      deprecated
           DESCRIPTION "********* THIS GROUP IS DEPRECATED **********

                       A collection of objects providing information
                       applicable to all ethernet-like network
                       interfaces."
           ::= { etherGroups 4 }

       etherStatsLowSpeedGroup OBJECT-GROUP
           OBJECTS     { dot3StatsSQETestErrors }
           STATUS      current
           DESCRIPTION "A collection of objects providing information
                       applicable to ethernet-like network interfaces
                       capable of operating at 10 Mb/s or slower in
                       half-duplex mode."
           ::= { etherGroups 5 }

       etherStatsHighSpeedGroup OBJECT-GROUP
           OBJECTS     { dot3StatsSymbolErrors }
           STATUS      current
           DESCRIPTION "A collection of objects providing information
                       applicable to ethernet-like network interfaces
                       capable of operating at 100 Mb/s or faster."
           ::= { etherGroups 6 }

       etherDuplexGroup OBJECT-GROUP
           OBJECTS     { dot3StatsDuplexStatus }
           STATUS      current
           DESCRIPTION "A collection of objects providing information
                       about the duplex mode of an ethernet-like
                       network interface."
           ::= { etherGroups 7 }

       etherControlGroup OBJECT-GROUP
           OBJECTS     { dot3ControlFunctionsSupported,
                         dot3ControlInUnknownOpcodes
                       }
           STATUS      current
           DESCRIPTION "A collection of objects providing information
                       about the MAC Control sublayer on ethernet-like
                       network interfaces."
           ::= { etherGroups 8 }

       etherControlPauseGroup OBJECT-GROUP
           OBJECTS     { dot3PauseAdminMode,
                         dot3PauseOperMode,
                         dot3InPauseFrames,



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                         dot3OutPauseFrames
                       }
           STATUS      current
           DESCRIPTION "A collection of objects providing information
                       about and control of the MAC Control PAUSE
                       function on ethernet-like network interfaces."
           ::= { etherGroups 9 }

       etherStatsBaseGroup2 OBJECT-GROUP
           OBJECTS     { dot3StatsIndex,
                         dot3StatsAlignmentErrors,
                         dot3StatsFCSErrors,
                         dot3StatsInternalMacTransmitErrors,
                         dot3StatsFrameTooLongs,
                         dot3StatsInternalMacReceiveErrors
                       }
           STATUS      current
           DESCRIPTION "A collection of objects providing information
                       applicable to all ethernet-like network
                       interfaces."
           ::= { etherGroups 10 }

       etherStatsHalfDuplexGroup OBJECT-GROUP
           OBJECTS     { dot3StatsSingleCollisionFrames,
                         dot3StatsMultipleCollisionFrames,
                         dot3StatsDeferredTransmissions,
                         dot3StatsLateCollisions,
                         dot3StatsExcessiveCollisions,
                         dot3StatsCarrierSenseErrors
                       }
           STATUS      current
           DESCRIPTION "A collection of objects providing information
                       applicable only to half-duplex ethernet-like
                       network interfaces."
           ::= { etherGroups 11 }

       etherHCStatsGroup OBJECT-GROUP
           OBJECTS     { dot3HCStatsAlignmentErrors,
                         dot3HCStatsFCSErrors,
                         dot3HCStatsInternalMacTransmitErrors,
                         dot3HCStatsFrameTooLongs,
                         dot3HCStatsInternalMacReceiveErrors,
                         dot3HCStatsSymbolErrors
                       }
           STATUS      current
           DESCRIPTION "A collection of objects providing high-capacity
                       statistics applicable to higher-speed
                       ethernet-like network interfaces."



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           ::= { etherGroups 12 }

       etherHCControlGroup OBJECT-GROUP
           OBJECTS     { dot3HCControlInUnknownOpcodes }
           STATUS      current
           DESCRIPTION "A collection of objects providing high-capacity
                       statistics for the MAC Control sublayer on
                       higher-speed ethernet-like network interfaces."
           ::= { etherGroups 13 }

       etherHCControlPauseGroup OBJECT-GROUP
           OBJECTS     { dot3HCInPauseFrames,
                         dot3HCOutPauseFrames
                       }
           STATUS      current
           DESCRIPTION "A collection of objects providing high-capacity
                       statistics for the MAC Control PAUSE function on
                       higher-speed ethernet-like network interfaces."
           ::= { etherGroups 14 }

       etherRateControlGroup OBJECT-GROUP
           OBJECTS     { dot3StatsRateControlAbility,
                         dot3StatsRateControlStatus
                       }
           STATUS      current
           DESCRIPTION "A collection of objects providing information
                       about the Rate Control function on ethernet-like
                       interfaces."
           ::= { etherGroups 15 }

   END


5.  Intellectual Property

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights.  Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in BCP-11.  Copies of
   claims of rights made available for publication and any assurances of
   licenses to be made available, or the result of an attempt made to
   obtain a general license or permission for the use of such
   proprietary rights by implementors or users of this specification can
   be obtained from the IETF Secretariat.



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   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights which may cover technology that may be required to practice
   this standard.  Please address the information to the IETF Executive
   Director.


6.  Acknowledgements

   This document was produced by the IETF Ethernet Interfaces and Hub
   MIB Working Group, whose efforts were greatly advanced by the
   contributions of the following people:

       Ran Atkinson
       Mike Ayers
       Mike Heard
       Lynn Kubinec
       Kam Lam
       Kerry McDonald
       Steve McRobert
       K.C. Norseth
       Dan Romascanu
       Randy Presuhn
       Andrew Smith
       Kaj Tesink
       Geoff Thompson

   This document is based on the Proposed Standard Ethernet MIB, RFC
   2665 [RFC2665], edited by John Flick of Hewlett-Packard and Jeffrey
   Johnson of RedBack Networks and produced by the Ethernet Interfaces
   and Hub MIB Working Group.  It extends that document by providing
   support for 10 Gb/s Ethernet interfaces as defined in [P802.3ae].

   RFC 2665, in turn, is based on the Proposed Standard Ethernet MIB,
   RFC 2358 [RFC2358], edited by John Flick of Hewlett-Packard and
   Jeffrey Johnson of RedBack Networks and produced by the 802.3 Hub MIB
   Working Group.  It extends that document by providing support for
   full-duplex Ethernet interfaces and 1000 Mb/sec Ethernet interfaces
   as outlined in [IEEE802.3].

   RFC 2358, in turn, is almost completely based on both the Standard
   Ethernet MIB, RFC 1643 [RFC1643], and the Proposed Standard Ethernet
   MIB using the SNMPv2 SMI, RFC 1650 [RFC1650], both of which were
   edited by Frank Kastenholz of FTP Software and produced by the
   Interfaces MIB Working Group.  RFC 2358 extends those documents by
   providing support for 100 Mb/sec ethernet interfaces.

   RFC 1643 and RFC 1650, in turn, are based on the Draft Standard



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   Ethernet MIB, RFC 1398 [RFC1398], also edited by Frank Kastenholz and
   produced by the Ethernet MIB Working Group.

   RFC 1398, in turn, is based on the Proposed Standard Ethernet MIB,
   RFC 1284 [RFC1284], which was edited by John Cook of Chipcom and
   produced by the Transmission MIB Working Group.  The Ethernet MIB
   Working Group gathered implementation experience of the variables
   specified in RFC 1284, documented that experience in RFC 1369
   [RFC1369], and used that information to develop this revised MIB.

   RFC 1284, in turn, is based on a document written by Frank
   Kastenholz, then of Interlan, entitled IEEE 802.3 Layer Management
   Draft M compatible MIB for TCP/IP Networks [KASTEN].  This document
   was modestly reworked, initially by the SNMP Working Group, and then
   by the Transmission Working Group, to reflect the current conventions
   for defining objects for MIB interfaces.  James Davin, of the MIT
   Laboratory for Computer Science, and Keith McCloghrie of Hughes LAN
   Systems, contributed to later drafts of this memo.  Marshall Rose of
   Performance Systems International, Inc. converted the document into
   RFC 1212 [RFC1212] concise format.  Anil Rijsinghani of DEC
   contributed text that more adequately describes the TDR test.  Thanks
   to Frank Kastenholz of Interlan and Louis Steinberg of IBM for their
   experimentation.


7.  References

   Normative References

   [RFC2578]    McCloghrie, K., Perkins, D., Schoenwaelder, J., Case,
                J., Rose, M. and S. Waldbusser, "Structure of Management
                Information Version 2 (SMIv2)", STD 58, RFC 2578, April
                1999.

   [RFC2579]    McCloghrie, K., Perkins, D., Schoenwaelder, J., Case,
                J., Rose, M. and S. Waldbusser, "Textual Conventions for
                SMIv2", STD 58, RFC 2579, April 1999.

   [RFC2580]    McCloghrie, K., Perkins, D., Schoenwaelder, J., Case,
                J., Rose, M. and S. Waldbusser, "Conformance Statements
                for SMIv2", STD 58, RFC 2580, April 1999.

   [IEEE802.3]  IEEE, IEEE Std 802.3, 2000 Edition: "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", (Adopted by ISO/IEC



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                and redesignated as ISO/IEC 8802-3:2000(E), 2000.

   [P802.3ae]   Law, D., Editor, Draft Supplement to IEEE Std. 802.3,
                IEEE Draft P802.3ae/D4.3, April 2002, work in
                progress.

   [RFC2863]    McCloghrie, K. and F. Kastenholz, "The Interfaces Group
                MIB using SMIv2", RFC 2863, June 2000.

   [MAU-MIB]    Flick, J., "Definitions of Managed Objects for IEEE
                802.3 Medium Attachment Units (MAUs) using SMIv2", work
                in progress, draft-ietf-hubmib-mau-mib-v3-02.txt,
                May 2002.

   Non-Normative References

   [RFC2571]    Harrington, D., Presuhn, R. and B. Wijnen, "An
                Architecture for Describing SNMP Management Frameworks",
                RFC 2571, April 1999.

   [RFC1155]    Rose, M. and K. McCloghrie, "Structure and
                Identification of Management Information for
                TCP/IP-based Internets", STD 16, RFC 1155, May 1990.

   [RFC1212]    Rose, M. and K. McCloghrie, "Concise MIB Definitions",
                STD 16, RFC 1212, March 1991.

   [RFC1215]    Rose, M., "A Convention for Defining Traps for use with
                the SNMP", RFC 1215, March 1991.

   [RFC1157]    Case, J., Fedor, M., Schoffstall, M. and J. Davin,
                "Simple Network Management Protocol", STD 15, RFC 1157,
                May 1990.

   [RFC1901]    Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
                "Introduction to Community-based SNMPv2", RFC 1901,
                January 1996.

   [RFC1906]    Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
                "Transport Mappings for Version 2 of the Simple Network
                Management Protocol (SNMPv2)", RFC 1906, January 1996.

   [RFC2572]    Case, J., Harrington, D., Presuhn R. and B. Wijnen,
                "Message Processing and Dispatching for the Simple
                Network Management Protocol (SNMP)", RFC 2572, May 1999.

   [RFC2574]    Blumenthal, U. and B. Wijnen, "User-based Security Model
                (USM) for version 3 of the Simple Network Management



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                Protocol (SNMPv3)", RFC 2574, May 1999.

   [RFC1905]    Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
                "Protocol Operations for Version 2 of the Simple Network
                Management Protocol (SNMPv2)", RFC 1905, January 1996.

   [RFC2573]    Levi, D., Meyer, P. and B. Stewart, "SNMPv3
                Applications", RFC 2573, May 1999.

   [RFC2575]    Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based
                Access Control Model (VACM) for the Simple Network
                Management Protocol (SNMP)", RFC 2575, May 1999.

   [RFC2570]    Case, J., Mundy, R., Partain, D. and B. Stewart,
                "Introduction to Version 3 of the Internet-Standard
                Network Management Framework", RFC 2570, April 1999.

   [KASTEN]     Kastenholz, F., "IEEE 802.3 Layer Management Draft
                compatible MIB for TCP/IP Networks", electronic mail
                message to mib-wg@nnsc.nsf.net, 9 June 1989.

   [RFC1284]    Cook, J., "Definitions of Managed Objects for
                Ethernet-Like Interface Types", RFC 1284, December 1991.

   [RFC1369]    Kastenholz, F., "Implementation Notes and Experience for
                The Internet Ethernet MIB", RFC 1369, October 1992.

   [RFC1398]    Kastenholz, F., "Definitions of Managed Objects for the
                Ethernet-like Interface Types", RFC 1398, January 1993.

   [RFC1643]    Kastenholz, F., "Definitions of Managed Objects for the
                Ethernet-like Interface Types", STD 50, RFC 1643, July
                1994.

   [RFC1650]    Kastenholz, F., "Definitions of Managed Objects for the
                Ethernet-like Interface Types using SMIv2", RFC 1650,
                August 1994.

   [RFC2358]    Flick, J. and J. Johnson, "Definitions of Managed
                Objects for the Ethernet-like Interface Types", RFC
                2358, June 1998.

   [RFC2665]    Flick, J., and J. Johnson, "Definitions of Managed
                Objects for the Ethernet-like Interface Types", RFC
                2665, August 1999.

   [RFC1213]    McCloghrie, K. and M. Rose, Editors, "Management
                Information Base for Network Management of TCP/IP-based



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                internets: MIB-II", STD 17, RFC 1213, March 1991.

   [RFC2119]    Bradner, S., "Key words for use in RFCs to Indicate
                Requirements Levels", BCP 14, RFC 2119, March 1997.

   [RFC2666]    Flick, J., "Definitions of Object Identifiers for
                Identifying Ethernet Chip Sets", RFC 2666, August 1999.

   [ETHERWIS]   Ayers, M., Flick, J., Heard, C. M., Lam, K., McDonald,
                K., Norseth, K. C., and K. Tesink, "Definitions of
                Managed Objects for the Ethernet WAN Interface
                Sublayer", work in progress,
                draft-ietf-hubmib-wis-mib-04.txt, May 2002.

   [CASE]       Case, J., and C. Partridge, "Case Diagrams: A First Step
                to Diagrammed Management Information Bases", Computer
                Communications Review, 19(1):13-16, January 1989.


8.  Security Considerations

   There are two management objects defined in this MIB that have a
   MAX-ACCESS clause of read-write.  Such objects may be considered
   sensitive or vulnerable in some network environments.  The support
   for SET operations in a non-secure environment without proper
   protection can have a negative effect on network operations.

   There are a number of managed objects in this MIB that may be
   considered to contain sensitive information.  In particular, the
   dot3StatsEtherChipSet object may be considered sensitive in many
   environments, since it would allow an intruder to obtain information
   about which vendor's equipment is in use on the network.  Note that
   this object has been deprecated.  However, some implementors may
   still choose to implement it for backwards compatability.

   Therefore, it may be important in some environments to control read
   access to these objects and possibly to even encrypt the values of
   these objects when sending them over the network via SNMP.  Not all
   versions of SNMP provide features for such a secure environment.

   SNMPv1 by itself is such an insecure environment.  Even if the
   network itself is secure (for example by using IPSec), even then,
   there is no control as to who on the secure network is allowed to
   access and GET (read) the objects in this MIB.

   It is recommended that the implementors consider the security
   features as provided by the SNMPv3 framework.  Specifically, the use
   of the User-based Security Model RFC 2574 [RFC2574] and the View-



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   based Access Control Model RFC 2575 [RFC2575] is recommended.

   It is then a customer/user responsibility to ensure that the SNMP
   entity giving access to an instance of this MIB, is properly
   configured to give access to those objects only to those principals
   (users) that have legitimate rights to access them.


9.  Author's Address

   John Flick
   Hewlett-Packard Company
   8000 Foothills Blvd. M/S 5557
   Roseville, CA 95747-5557

   Phone: +1 916 785 4018
   Email: johnf@rose.hp.com


A.  Change Log


A.1.  Changes since RFC 2665

   This section enumerates changes made to RFC 2665 to produce this
   document.

      (1)   Updated references to the IEEE 802.3 standard to
            refer to the 2000 edition.

      (2)   Added reference to 802.3ae.

      (3)   Updated WG e-mail address.

      (4)   The following DESCRIPTION clauses have been updated
            to reflect behaviour on 10 Gb/s interfaces:
            dot3StatsAlignmentErrors and dot3StatsSymbolErrors.

      (5)   The following objects have been added for management
            of the Rate Control function in WAN applications of
            ethernet:  dot3StatsRateControlAbility and
            dot3StatsRateControlStatus.

      (6)   The following 64-bit counters have been added to
            support operation on high-speed ethernet interfaces:
            dot3HCControlInUnknownOpcodes, dot3HCInPauseFrames,
            dot3HCOutPauseFrames, dot3HCStatsAlignmentErrors,
            dot3HCStatsFCSErrors, dot3HCStatsFrameTooLongs,



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            dot3HCStatsInternalMacTransmitErrors,
            dot3HCStatsInternalMacReceiveErrors,
            dot3StatsSymbolErrors

      (7)   Object groups and compliances have been added to
            contain the new objects.

      (8)   The MODULE-IDENTITY clause has been updated to
            reflect the changes in the MIB module.

      (9)   Use of the various ifType values for ethernet has
            been clarified to emphasize that all ethernet-like
            interfaces must use the ethernetCsmacd ifType.

      (10)  Several clarifications were made to the section on
            the mapping of the Interface MIB objects to ethernet.

      (11)  MIB boilerplate in section 2 has been updated to the
            latest approved text.


A.2.  Changes between RFC 2358 and RFC 2665

   This section enumerates changes made to RFC 2358 to produce RFC 2665.

      (1)   Section 2 has been replaced with the current SNMP
            Management Framework boilerplate.

      (2)   The ifMtu mapping has been clarified.

      (3)   The relationship between the IEEE 802.3 octet counters
            and the IF-MIB octet counters has been clarified.

      (4)   REFERENCE clauses have been updated to reflect the
            actual IEEE 802.3 managed object that each MIB object
            is based on.

      (5)   The following object DESCRIPTION clauses have been
            updated to reflect that they do not increment in
            full-duplex mode: dot3StatsSingleCollisionFrames,
            dot3StatsMultipleCollisionFrames, dot3StatsSQETestErrors,
            dot3StatsDeferredTransmissions, dot3StatsLateCollisions,
            dot3StatsExcessiveCollisions, dot3StatsCarrierSenseErrors,
            dot3CollFrequencies.

      (6)   The following object DESCRIPTION clauses have been
            updated to reflect behaviour on full-duplex and
            1000 Mb/s interfaces: dot3StatsAlignmentErrors,



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            dot3StatsFCSErrors, dot3StatsSQETestErrors,
            dot3StatsLateCollisions, dot3StatsSymbolErrors.

      (7)   Two new tables, dot3ControlTable and dot3PauseTable,
            have been added.

      (8)   A new object, dot3StatsDuplexStatus, has been added.

      (9)   The object groups and compliances have been restructured.

      (10)  The dot3StatsEtherChipSet object has been deprecated.

      (11)  The dot3ChipSets have been moved to a separate document.


A.3.  Changes between RFC 1650 and RFC 2358

   This section enumerates changes made to RFC 1650 to produce RFC 2358.

      (1)   The MODULE-IDENTITY has been updated to reflect the changes
            in the MIB.

      (2)   A new object, dot3StatsSymbolErrors, has been added.

      (3)   The definition of the object dot3StatsIndex has been
            converted to use the SMIv2 OBJECT-TYPE macro.

      (4)   A new conformance group, etherStats100MbsGroup, has been
            added.

      (5)   A new compliance statement, ether100MbsCompliance, has
            been added.

      (6)   The Acknowledgements were extended to provide a more
            complete history of the origin of this document.

      (7)   The discussion of ifType has been expanded.

      (8)   A section on mapping of Interfaces MIB objects has
            been added.

      (9)   A section defining the relationship of this MIB to
            the MAU MIB has been added.

      (10)  A section on the mapping of IEEE 802.3 managed objects
            to this MIB and the Interfaces MIB has been added.

      (11)  Converted the dot3Tests, dot3Errors, and dot3ChipSets



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            OIDs to use the OBJECT-IDENTITY macro.

      (12)  Added to the list of registered dot3ChipSets.

      (13)  An intellectual property notice and copyright notice
            were added, as required by RFC 2026.


B.  Full Copyright Statement

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published and
   distributed, in whole or in part, without restriction of any kind,
   provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
















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