RFC 1284                 ETHERNET-LIKE OBJECTS             December 1991


    dot3StatsInRangeLengthErrors OBJECT-TYPE
        SYNTAX  Counter
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "A count of frames received on a particular
                interface with a length field value that falls
                between the minimum unpadded LLC data size and the
                maximum allowed LLC data size inclusive and that
                does not match the number of LLC data octets
                received.

                The count represented by an instance of this
                object also includes frames for which the length
                field value is less than the minimum unpadded LLC
                data size."
        ::= { dot3StatsEntry 14 }

    dot3StatsOutOfRangeLengthFields OBJECT-TYPE
        SYNTAX  Counter
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "A count of frames received on a particular
                interface for which the length field value exceeds
                the maximum allowed LLC data size.

                The count represented by an instance of this
                object is not incremented in implementations that
                observe Ethernet encapsulation conventions (by
                which the IEEE 802.3 length field is interpreted
                as the Ethernet Type field)."
        ::= { dot3StatsEntry 15 }

    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, the
                dot3StatsFCSErrors object, the
                dot3StatsInRangeLengthErrors object, or the



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                dot3StatsOutOfRangeLengthFields 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."
        ::= { dot3StatsEntry 16 }


    -- 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   { dot3CollIndex, dot3CollCount }
        ::= { dot3CollTable 1 }

    Dot3CollEntry ::=
        SEQUENCE {
            dot3CollIndex
                INTEGER,
            dot3CollCount
                INTEGER,
            dot3CollFrequencies
                Counter



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        }

    dot3CollIndex OBJECT-TYPE
        SYNTAX  INTEGER
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The index value that uniquely identifies the
                interface to which a particular collision
                histogram cell pertains.  The interface identified
                by a particular value of this index is the same
                interface as identified by the same value of
                ifIndex."
        ::= { dot3CollEntry 1 }

    dot3CollCount OBJECT-TYPE
        SYNTAX  INTEGER (1..16)
        ACCESS  read-only
        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 is accompanied by a
                particular number of media collisions."
        ::= { dot3CollEntry 3 }


    --  802.3 Tests

    -- The ifExtnsTestTable defined in [11] provides a common means
    -- for a manager to test any interface corresponding to a value
    -- of ifIndex.

    -- At this time, one well known test (testFullDuplexLoopBack) is
    -- defined in [11].  For ethernet-like interfaces, this test
    -- configures the MAC chip and executes an internal loopback
    -- test of memory and the MAC chip logic.  This loopback test can



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    -- 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 object ifExtnsTestResult
    -- (defined in [11]) will be set to failed(7).  The following two
    -- OBJECT IDENTIFIERs may be used to provided more information as
    -- values for the object ifExtnsTestCode in [11]:

    dot3Errors             OBJECT IDENTIFIER ::= { dot3 7 }

                              -- 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 }


    --  TDR Test

    -- Another test, specific to ethernet-like interfaces,
    -- is Time-domain Reflectometry (TDR) which is defined
    -- as follows:

    dot3Tests   OBJECT IDENTIFIER ::= { dot3 6 }
    dot3TestTdr OBJECT IDENTIFIER ::= { dot3Tests 1 }

    -- A TDR test returns as its result the time interval between the
    -- most recent TDR test transmission and the subsequent detection
    -- of a collision.  This interval is based on a 10 MHz clock and
    -- should be normalized if the time base is other than 10 MHz.
    -- 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 instance
    -- is stored in the corresponding instance of ifExtnsTestResult
    -- (thereby indicating where the result has been stored).


   --  802.3 Hardware Chipsets

   -- The object ifExtnsChipSet is provided in [11] to identify the
   -- MAC hardware used to communcate on an interface.  The following
   -- hardware chipsets are provided for 802.3:

   dot3ChipSets          OBJECT IDENTIFIER ::= { dot3 8 }
   dot3ChipSetAMD        OBJECT IDENTIFIER ::= { dot3ChipSets 1 }
   dot3ChipSetAMD7990    OBJECT IDENTIFIER ::= { dot3ChipSetAMD 1 }



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   dot3ChipSetAMD79900   OBJECT IDENTIFIER ::= { dot3ChipSetAMD 2 }

   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 }

   -- 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 [3]).

   END

6.  Acknowledgements

   This document was produced by the Transmission MIB Working Group.

   This document 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 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.  Thanks to Frank Kastenholz of Interlan
   and Louis Steinberg of IBM for their experimentation.

7.  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



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       Group", RFC 1109, NRI, August 1989.

   [3] Rose M., and K. McCloghrie, "Structure and Identification of
       Management Information for TCP/IP-based internets", 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", 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", 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.

  [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.






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Security Considerations

   Security issues are not discussed in this memo.

Author's Address

   John Cook
   Chipcom Corporation
   118 Turnpike Road
   Southborough, MA  01772

   For more information, contact the chair of the Ethernet MIB working
   group:

   Frank Kastenholz
   Clearpoint Research Inc
   35 Parkwood Drive
   Hopkinton Mass 01748

   Phone: 508-435-2000
   EMail: kasten@europa.clearpoint.com






























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