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Network Working Group                                      F. Kastenholz
Request for Comments: 1623                            FTP Software, Inc.
Obsoletes: 1398                                                 May 1994
STD: 50
Category: Standards Track


                   Definitions of Managed Objects for
                   the Ethernet-like Interface Types

Status of this Memo

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

Table of Contents

   Introduction .............................................    1
   1. The SNMP Network Management Framework .................    2
   1.1 Object Definitions ...................................    2
   2. Change Log ............................................    2
   3. Overview ..............................................    3
   3.1 Relation to RFC 1213 .................................    4
   3.2 Relation to RFC 1573 .................................    4
   3.2.1 Layering Model .....................................    4
   3.2.2 Virtual Circuits ...................................    4
   3.2.3 ifTestTable ........................................    4
   3.2.4 ifRcvAddressTable ..................................    5
   3.2.5 ifPhysAddress ......................................    5
   3.2.6 ifType .............................................    6
   4. Definitions ...........................................    6
   5. Acknowledgements ......................................   16
   6. References ............................................   17
   7. Security Considerations ...............................   19
   8. Author's Address ......................................   19

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 objects.

   This memo also includes a MIB module.  This MIB module corrects minor
   errors in the earlier version of this MIB: RFC 1398 [15].




Kastenholz                                                      [Page 1]

RFC 1623                   Ethernet-Like MIB                    May 1994


1.  The SNMP Network Management Framework

   The SNMP Network Management Framework consists of three major
   components.  They are:

      o    STD 16/RFC 1155 [3] which defines the SMI, the mechanisms
           used for describing and naming objects for the purpose of
           management.  STD 16/RFC 1212 [13] defines a more concise
           description mechanism, which is wholly consistent with
           the SMI.

      o    RFC 1156 [4] which defines MIB-I, the core set of managed
           objects for the Internet suite of protocols.  STD 17/RFC
           1213 [6] defines MIB-II, an evolution of MIB-I based on
           implementation experience and new operational
           requirements.

      o    STD 15/RFC 1157 [5] which defines the SNMP, the protocol
           used for network access to managed objects.

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

1.1.  Object Definitions

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using the subset of Abstract Syntax Notation One (ASN.1) [7]
   defined in the SMI [16].  In particular, each object object type is
   named by an OBJECT IDENTIFIER, an administratively assigned name.
   The object type together with an object instance serves to uniquely
   identify a specific instantiation of the object.  For human
   convenience, we often use a textual string, termed the descriptor, to
   refer to the object type.

2.  Change Log

   This section enumerates changes made to RFC 1398 to produce this
   document.

    (1)   A section describing the applicability of various parts
          of RFC 1573 to ethernet-like interfaces has been added.

    (2)   A minor error in the description of the TDR test was
          fixed.

    (3)   A loopback test was defined to replace the standard
          loopback test that was defined in RFC 1229.



Kastenholz                                                      [Page 2]

RFC 1623                   Ethernet-Like MIB                    May 1994


    (4)   The description of dot3CollFrequencies was made a bit
          clearer.

    (5)   A new object, EtherChipset, has been added. This object
          replaces the ifExtnsChipSet object, which has been
          removed per the Interface MIB Evolution effort.

    (6)   Several minor editorial changes, spelling corrections,
          grammar and punctuation corrections, and so forth, were
          made.

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 three values of the ifType object in the
   Internet-standard MIB:

         ethernet-csmacd(6)
         iso88023-csmacd(7)
         starLan(11)

   For these interfaces, the value of the ifSpecific variable in the
   MIB-II [6] has the OBJECT IDENTIFIER value:

      dot3    OBJECT IDENTIFER ::= { experimental 3 }

   The definitions presented here are based on the IEEE 802.3 Layer
   Management Specification [9], as originally interpreted by Frank
   Kastenholz then of Interlan in [10].  Implementors of these MIB
   objects should note that the IEEE document 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 [9] are
   represented by previously defined objects in the Internet-standard
   MIB or in the Generic Interface Extensions MIB [11], 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.





Kastenholz                                                      [Page 3]

RFC 1623                   Ethernet-Like MIB                    May 1994


3.1.  Relation to RFC 1213

   This section applies only when this MIB is used in conjunction with
   the "old" (i.e., pre-RFC 1573) interface group.

   The relationship between an ethernet-like interface and an interface
   in the context of the Internet-standard MIB 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.

3.2.  Relation to RFC 1573

   RFC 1573, the Interface MIB Evolution, 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 RFC 1573
   to avoid over constraining the MIB, thereby precluding management of
   certain media-types.

   Section 3.3 of RFC 1573 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 RFC 1573 in
   order to understand the general intent of these areas.

3.2.1.  Layering Model

   This MIB does not provide for layering.  There are no sublayers.

   EDITOR'S NOTE:

      I could forsee the development of an 802.2 and enet-transceiver
      MIB.  They could be higher and lower sublayers, respectively.  All
      that THIS document should do is allude to the possibilities and
      urge the implementor to be aware of the possibility and that they
      may have requirements which supersede the requirements in this
      document.

3.2.2.  Virtual Circuits

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

3.2.3.  ifTestTable

   This MIB defines two tests for media which are instumented with this
   MIB; TDR and Loopback.  Implementation of these tests is not
   required.  Many common interface chips do not support one or both of
   these tests.




Kastenholz                                                      [Page 4]

RFC 1623                   Ethernet-Like MIB                    May 1994


   These two tests are provided as a convenience, allowing a common
   method to invoke the test.

   Standard MIBs do not include objects in which to return the results
   of the TDR test.  Any needed objects MUST be provided in the vendor
   specific MIB.

3.2.4.  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.

3.2.5.  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).

   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.








Kastenholz                                                      [Page 5]

RFC 1623                   Ethernet-Like MIB                    May 1994


3.2.6.  ifType

   This MIB applies to interfaces which have any of the following three
   ifType values:

         ethernet-csmacd(6)
         iso88023-csmacd(7)
         starLan(11)

   Interfaces with any of these ifType values map to the EtherLike-MIB
   in the same manner.  The EtherLike-MIB applies equally to all three
   types; there are no implementation differences.

4.  Definitions

   EtherLike-MIB DEFINITIONS ::= BEGIN

      IMPORTS
          Counter, Gauge  FROM RFC1155-SMI
          transmission    FROM RFC1213-MIB
          OBJECT-TYPE     FROM RFC-1212;

       -- This MIB module uses the extended OBJECT-TYPE macro as
       -- defined in RFC-1212.

      dot3    OBJECT IDENTIFIER ::= { transmission 7 }

      -- the Ethernet-like Statistics group

       dot3StatsTable  OBJECT-TYPE
            SYNTAX     SEQUENCE OF Dot3StatsEntry
            ACCESS     not-accessible
            STATUS     mandatory
            DESCRIPTION
             "Statistics for a collection of ethernet-like
             interfaces attached to a particular system."
            ::= { dot3 2 }


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



Kastenholz                                                      [Page 6]

RFC 1623                   Ethernet-Like MIB                    May 1994


       Dot3StatsEntry ::= SEQUENCE {
            dot3StatsIndex                      INTEGER,
            dot3StatsAlignmentErrors            Counter,
            dot3StatsFCSErrors                  Counter,
            dot3StatsSingleCollisionFrames      Counter,
            dot3StatsMultipleCollisionFrames    Counter,
            dot3StatsSQETestErrors              Counter,
            dot3StatsDeferredTransmissions      Counter,
            dot3StatsLateCollisions             Counter,
            dot3StatsExcessiveCollisions        Counter,
            dot3StatsInternalMacTransmitErrors  Counter,
            dot3StatsCarrierSenseErrors         Counter,
            dot3StatsFrameTooLongs              Counter,
            dot3StatsInternalMacReceiveErrors   Counter
       }

       dot3StatsIndex   OBJECT-TYPE
            SYNTAX      INTEGER
            ACCESS      read-only
            STATUS      mandatory
            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."
            ::= { dot3StatsEntry 1 }

       dot3StatsAlignmentErrors   OBJECT-TYPE
            SYNTAX     Counter
            ACCESS     read-only
            STATUS     mandatory
            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 obtain are,
             according to the conventions of IEEE 802.3
             Layer Management, counted exclusively according
             to the error status presented to the LLC."
            REFERENCE
            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 2 }



Kastenholz                                                      [Page 7]

RFC 1623                   Ethernet-Like MIB                    May 1994


       dot3StatsFCSErrors   OBJECT-TYPE
            SYNTAX      Counter
            ACCESS      read-only
            STATUS      mandatory
            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.

            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 obtain are,
            according to the conventions of IEEE 802.3
            Layer Management, counted exclusively according
            to the error status presented to the LLC."
            REFERENCE
            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 3 }

       dot3StatsSingleCollisionFrames   OBJECT-TYPE
            SYNTAX      Counter
            ACCESS      read-only
            STATUS      mandatory
            DESCRIPTION
            "A count of successfully transmitted frames on
            a particular interface for which transmission
            is inhibited by exactly one collision.

            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."
            REFERENCE
            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 4 }

       dot3StatsMultipleCollisionFrames   OBJECT-TYPE
            SYNTAX      Counter
            ACCESS      read-only
            STATUS      mandatory
            DESCRIPTION
            "A count of successfully transmitted frames on
            a particular interface for which transmission



Kastenholz                                                      [Page 8]

RFC 1623                   Ethernet-Like MIB                    May 1994


             is inhibited by more than one collision.

            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."
            REFERENCE
            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 5 }

       dot3StatsSQETestErrors   OBJECT-TYPE
            SYNTAX     Counter
            ACCESS     read-only
            STATUS     mandatory
            DESCRIPTION
            "A count of times that the SQE TEST ERROR
            message is generated by the PLS sublayer for a
            particular interface. The SQE TEST ERROR
            message is defined in section 7.2.2.2.4 of
            ANSI/IEEE 802.3-1985 and its generation is
            described in section 7.2.4.6 of the same
            document."
            REFERENCE
            "ANSI/IEEE Std 802.3-1985 Carrier Sense
            Multiple Access with Collision Detection Access
            Method and Physical Layer Specifications"
            ::= { dot3StatsEntry 6 }

       dot3StatsDeferredTransmissions   OBJECT-TYPE
            SYNTAX      Counter
            ACCESS      read-only
            STATUS      mandatory
            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."
            REFERENCE
            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 7 }

       dot3StatsLateCollisions   OBJECT-TYPE



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            SYNTAX      Counter
            ACCESS      read-only
            STATUS      mandatory
            DESCRIPTION
            "The number of times that a collision is
            detected on a particular interface later than
            512 bit-times into the transmission of a
            packet.

            Five hundred and twelve bit-times corresponds
            to 51.2 microseconds on a 10 Mbit/s system. A
            (late) collision included in a count
            represented by an instance of this object is
            also considered as a (generic) collision for
            purposes of other collision-related
            statistics."
            REFERENCE
            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 8 }

       dot3StatsExcessiveCollisions   OBJECT-TYPE
            SYNTAX    Counter
            ACCESS    read-only
            STATUS    mandatory
            DESCRIPTION
            "A count of frames for which transmission on a
            particular interface fails due to excessive
            collisions."
            REFERENCE
            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 9 }


       dot3StatsInternalMacTransmitErrors   OBJECT-TYPE
            SYNTAX    Counter
            ACCESS    read-only
            STATUS    mandatory
            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."
            REFERENCE
            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 10 }

       dot3StatsCarrierSenseErrors   OBJECT-TYPE
            SYNTAX    Counter
            ACCESS    read-only
            STATUS    mandatory
            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."
            REFERENCE
            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 11 }

       -- { dot3StatsEntry 12 } is not assigned

       dot3StatsFrameTooLongs   OBJECT-TYPE
            SYNTAX    Counter
            ACCESS    read-only
            STATUS    mandatory
            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 obtain are,
            according to the conventions of IEEE 802.3
            Layer Management, counted exclusively according
            to the error status presented to the LLC."
            REFERENCE



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            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 13 }

       -- { dot3StatsEntry 14 } is not assigned

       -- { dot3StatsEntry 15 } is not assigned

       dot3StatsInternalMacReceiveErrors   OBJECT-TYPE
            SYNTAX    Counter
            ACCESS    read-only
            STATUS    mandatory
            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."
            REFERENCE
            "IEEE 802.3 Layer Management"
            ::= { dot3StatsEntry 16 }

       dot3StatsEtherChipSet   OBJECT-TYPE
            SYNTAX        OBJECT IDENTIFIER
            ACCESS        read-only
            STATUS        mandatory
            DESCRIPTION
            "This object contains an OBJECT IDENTIFIER
            which identifies the chipset used to
            realize the interface. Ethernet-like
            interfaces are typically built out of
            several different chips. The MIB implementor
            is presented with a decision of which chip
            to identify via this object. The implementor
            should identify the chip which is usually
            called the Medium Access Control chip.
            If no such chip is easily identifiable,
            the implementor should identify the chip
            which actually gathers the transmit



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            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 }

       -- 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
            ACCESS    not-accessible
            STATUS    mandatory
            DESCRIPTION
            "A collection of collision histograms for a
            particular set of interfaces."
            ::= { dot3 5 }


       dot3CollEntry  OBJECT-TYPE
            SYNTAX    Dot3CollEntry
            ACCESS    not-accessible
            STATUS    mandatory
            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  Counter
       }

       -- { dot3CollEntry 1 } is no longer in use

       dot3CollCount  OBJECT-TYPE
            SYNTAX    INTEGER (1..16)



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            ACCESS    not-accessible
            STATUS    mandatory
            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    Counter
            ACCESS    read-only
            STATUS    mandatory
            DESCRIPTION
            "A count of individual MAC frames for which the
            transmission (successful or otherwise) on a
            particular interface occurs after the
            frame has experienced exactly the number
            of collisions in the associated
            dot3CollCount object.

            For example, a frame which is transmitted
            on interface 77 after experiencing
            exactly 4 collisions would be indicated
            by incrementing only dot3CollFrequencies.77.4.
            No other instance of dot3CollFrequencies would
            be incremented in this example."
            ::= { dot3CollEntry 3 }

       --  802.3 Tests

       dot3Tests   OBJECT IDENTIFIER ::= { dot3 6 }

       dot3Errors  OBJECT IDENTIFIER ::= { dot3 7 }


       --  TDR Test

       -- The Time-Domain Reflectometry (TDR) test is specific
       -- to ethernet-like interfaces with the exception of
       -- 10BaseT and 10BaseF. 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.

       dot3TestTdr OBJECT IDENTIFIER ::= { dot3Tests 1 }



Kastenholz                                                     [Page 14]

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       -- 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 the appropriate instance of the
       -- MIB object dot3TestTdrValue, and the OBJECT IDENTIFIER
       -- of that instanceis stored in the corresponding instance
       -- of ifExtnsTestCode (thereby indicating where the
       -- result has been stored).


       -- Loopback Test

       -- Another test is the full-duplex loopback test.
       -- This test configures the MAC chip and executes
       -- 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.

       dot3TestLoopBack OBJECT IDENTIFIER ::= { dot3Tests 2 }

       -- If an error occurs during a test, the object
       -- ifTestResult (defined in RFC1573) will be set
       -- to failed(7).  The following two OBJECT
       -- IDENTIFIERs may be used to provided more
       -- information as values for ifTestCode.

                -- couldn't initialize MAC chip for test
       dot3ErrorInitError     OBJECT IDENTIFIER ::= { dot3Errors 1 }

                -- expected data not received (or not
                -- received correctly) in loopback test
       dot3ErrorLoopbackError OBJECT IDENTIFIER ::= { dot3Errors 2 }

       -- RFC1573 does away with the interface chipset object.
       -- The following OBJECT IDENTIFIER definitions are
       -- retained for purposes of backwards compatibility
       -- with pre-RFC1573 systems.
       --  802.3 Hardware Chipsets

       -- The object ifExtnsChipSet is provided in RFC1229 to
       -- identify the MAC hardware used to communcate on an
       -- interface.  The following hardware chipsets are
       -- provided for 802.3:



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       dot3ChipSets          OBJECT IDENTIFIER ::= { dot3 8 }
       dot3ChipSetAMD        OBJECT IDENTIFIER ::= { dot3ChipSets 1 }
       dot3ChipSetAMD7990    OBJECT IDENTIFIER ::= { dot3ChipSetAMD 1 }
       dot3ChipSetAMD79900   OBJECT IDENTIFIER ::= { dot3ChipSetAMD 2 }
       dot3ChipSetAMD79C940  OBJECT IDENTIFIER ::= { dot3ChipSetAMD 3 }

       dot3ChipSetIntel      OBJECT IDENTIFIER ::= { dot3ChipSets 2 }
       dot3ChipSetIntel82586 OBJECT IDENTIFIER ::= { dot3ChipSetIntel 1 }
       dot3ChipSetIntel82596 OBJECT IDENTIFIER ::= { dot3ChipSetIntel 2 }

       dot3ChipSetSeeq       OBJECT IDENTIFIER ::= { dot3ChipSets 3 }
       dot3ChipSetSeeq8003   OBJECT IDENTIFIER ::= { dot3ChipSetSeeq 1 }

       dot3ChipSetNational      OBJECT IDENTIFIER ::= { dot3ChipSets 4 }
       dot3ChipSetNational8390  OBJECT IDENTIFIER ::=
                                  { dot3ChipSetNational 1 }
       dot3ChipSetNationalSonic OBJECT IDENTIFIER ::=
                                  { dot3ChipSetNational 2 }

       dot3ChipSetFujitsu       OBJECT IDENTIFIER ::= { dot3ChipSets 5 }
       dot3ChipSetFujitsu86950  OBJECT IDENTIFIER ::=
                                  { dot3ChipSetFujitsu 1 }

       dot3ChipSetDigital       OBJECT IDENTIFIER ::= { dot3ChipSets 6 }
       dot3ChipSetDigitalDC21040  OBJECT IDENTIFIER ::=
                                  { dot3ChipSetDigital 1 }

       -- For those chipsets not represented above, OBJECT IDENTIFIER
       -- assignment is required in other documentation, e.g., assignment
       -- within that part of the registration tree delegated to
       -- individual enterprises (see RFC1155).

   END

5.  Acknowledgements

   This document was produced by the Ethernet MIB Working Group.

   This document is based on the Proposed Standard Ethernet MIB, RFC
   1284 [14], of which Jihn Cook of Chipcom was the editor.  The
   Ethernet MIB Working Group gathered implementation experience of the
   variables specified in RFC 1284 and used that information to develop
   this revised MIB.

   RFC 1284, in turn, is based on a document written by Frank Kastenholz
   of Interlan entitled IEEE 802.3 Layer Management Draft M compatible
   MIB for TCP/IP Networks [10].  This document has been modestly
   reworked, initially by the SNMP Working Group, and then by the



Kastenholz                                                     [Page 16]

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   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
   its current 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.

6.  References

   [1] Cerf, V., "IAB Recommendations for the Development of Internet
       Network Management Standards", RFC 1052, NRI, April 1988.

   [2] Cerf, V., "Report of the Second Ad Hoc Network Management Review
       Group", RFC 1109, NRI, August 1989.

   [3] Rose M., and K. McCloghrie, "Structure and Identification of
       Management Information for TCP/IP-based internets", STD 16, RFC
       1155, Performance Systems International, Hughes LAN Systems, May
       1990.

   [4] McCloghrie K., and M. Rose, "Management Information Base for
       Network Management of TCP/IP-based internets", RFC 1156, Hughes
       LAN Systems, Performance Systems International, May 1990.

   [5] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple
       Network Management Protocol", STD 15, RFC 1157, SNMP Research,
       Performance Systems International, Performance Systems
       International, MIT Laboratory for Computer Science, May 1990.

   [6] McCloghrie K., and M. Rose, Editors, "Management Information Base
       for Network Management of TCP/IP-based internets", STD 17, RFC
       1213, Performance Systems International, March 1991.

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

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

   [9] IEEE, "IEEE 802.3 Layer Management", November 1988.




Kastenholz                                                     [Page 17]

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  [10] 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.

  [11] McCloghrie, K., Editor, "Extensions to the Generic-Interface
       MIB", RFC 1229, Hughes LAN Systems, Inc., May 1991.

  [12] IEEE, "Carrier Sense Multiple Access with Collision Detection
       (CSMA/CD) Access Method and Physical Layer Specifications",
       ANSI/IEEE Std 802.3-1985.

  [13] Rose, M., and K. McCloghrie, Editors, "Concise MIB Definitions",
       RFC 1212, Performance Systems International, Hughes LAN Systems,
       March 1991.

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

  [15] Kastenholz, F., "Definitions of Managed Objects for the Etheret-
       like Interface Types", RFC 1398, FTP Software, Inc., January
       1993.

  [16] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Structure
       of Management Information for version 2 of the Simple Network
       Management Protocol (SNMPv2)", RFC 1442, SNMP Research, Inc.,
       Hughes LAN Systems, Dover Beach Consulting, Inc., Carnegie Mellon
       University, April 1993.

  [17] Galvin, J., and K. McCloghrie, "Administrative Model for version
       2 of the Simple Network Management Protocol (SNMPv2)", RFC 1445,
       Trusted Information Systems, Hughes LAN Systems, April 1993.

  [18] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol
       Operations for version 2 of the Simple Network Management
       Protocol (SNMPv2)", RFC 1448, SNMP Research, Inc., Hughes LAN
       Systems, Dover Beach Consulting, Inc., Carnegie Mellon
       University, April 1993.

  [19] McCloghrie, K., and F. Kastenholz, "Evolution of the Interfaces
       Group of MIB-II", RFC 1573, Hughes LAN Systems, FTP Software,
       January 1994.









Kastenholz                                                     [Page 18]

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7.  Security Considerations

   Security issues are not discussed in this memo.

8.  Author's Address

   Frank Kastenholz
   FTP Software, Inc.
   2 High Street
   North Andover, Mass, USA 01845

   Phone: 508-685-4000
   EMail: kasten@ftp.com






































Kastenholz                                                     [Page 19]