rfc1230.txt

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                             passed the token."
                     ::= { dot4StatsEntry 2 }

          dot4StatsTokenHeards OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  optional
                     DESCRIPTION
                             "The number of tokens heard by this
                             station."
                     ::= { dot4StatsEntry 3 }

          dot4StatsNoSuccessors OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The number of times the station could
                             not find a successor while believing
                             itself not the only station in the ring.
                             This can signify a faulty transmitter
                             condition in this station."
                     ::= { dot4StatsEntry 4 }

          dot4StatsWhoFollows OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The number of times the station has had
                             to look for a new next station."
                     ::= { dot4StatsEntry 5 }

          dot4StatsTokenPassFails OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  mandatory



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                     DESCRIPTION
                             "The number of times the station failed in
                             passing the token to the next station."
                     ::= { dot4StatsEntry 6 }

          dot4StatsNonSilences OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The number of occurrences of non-silence
                             followed by silence in which a start
                             delimiter was not detected."
                     ::= { dot4StatsEntry 7 }

          dot4StatsFcsErrors OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The number of frames received with an
                             incorrect FCS and the E-bit reset."
                     ::= { dot4StatsEntry 8 }

          dot4StatsEbitErrors OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The number of frames the station
                             received with the E-bit set in the
                             end delimiter."
                     ::= { dot4StatsEntry 9 }

          dot4StatsFrameFrags OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The number of occurrences of receiving a
                             start delimiter followed by another start
                             delimiter, an invalid symbol sequence or
                             silence, without an intervening end
                             delimiter."
                     ::= { dot4StatsEntry 10 }

          dot4StatsFrameTooLongs OBJECT-TYPE
                     SYNTAX  Counter



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                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The number of frames that were received
                             that were larger than the media's MTU."
                     ::= { dot4StatsEntry 11 }

          dot4StatsOverRuns OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The number of times a FIFO overrun was
                             detected in the station."
                     ::= { dot4StatsEntry 12 }

          dot4StatsDupAddresses OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The number of times this station
                             detected another station using the same
                             MAC address."
                     ::= { dot4StatsEntry 13 }


          --                      802.4 Interface Tests

          dot4Tests         OBJECT IDENTIFIER ::= { dot4 5 }

          -- The extensions to the interfaces table proposed in [11]
          -- define a table object, ifExtnsTestTable, through which a
          -- network manager can instruct an agent to test an interface
          -- for various faults.  A test to be performed is identified
          -- (as the value of ifExtnsTestType) via an OBJECT IDENTIFIER.

          -- When a test fails, the object ifExtnsTestCode, defined in
          -- [11], may contain a media-specific error-code.  For 802.4
          -- interfaces, the following is defined as the value of
          -- ifExtnsTestCode when a test fails because the modem could
          -- not be initialized:

          dot4Errors OBJECT IDENTIFIER ::= { dot4 4 }
          dot4ModemInitFailed OBJECT IDENTIFIER ::= { dot4Errors 1 }

          -- The Full-Duplex Loop Back Test is a common test, defined
          -- in [11] as:



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          --
          --    testFullDuplexLoopBack
          --
          -- Invoking this test on a 802.4 interface causes the
          -- interface to check the path from memory through the chip
          -- set's serial interface back to memory, thus checking the
          -- proper functioning of the transmit and receive machines
          -- of the token bus hardware.
          -- This test may only be invoked when the interface is
          -- the Offline state.

          -- The FIFO Path test is defined by:

          testFifoPath   OBJECT IDENTIFIER ::= { dot4Tests 1 }

          -- Invoking this test causes the interface to check the path
          -- from memory to the chip set's FIFO and back to memory.
          -- This test checks the hosts interface to the token bus
          -- hardware.  This test may only be invoked when the
          -- interface is the Offline state.

          -- The External Loopback test is defined by:

          testExternalLoopback OBJECT IDENTIFIER ::= { dot4Tests 2 }

          -- Invoking this test causes the interface to check the path
          -- from memory through the chip set and out onto the network
          -- for external (e.g., at the head-end) loopback through the
          -- chip set to memory. This test checks the host's interface
          -- to the 802.4 network.  This test is liable to cause
          -- serious disruption if invoked on an operational network.



          --                 802.4 Hardware Chip Sets

          dot4ChipSets       OBJECT IDENTIFIER ::= { dot4 6 }

          -- The extensions to the interfaces table proposed in [11]
          -- define an object, ifExtnsChipSet, with the syntax of
          -- OBJECT IDENTIFIER, to identify the hardware chip set in
          -- use by an interface.  That definition specifies just
          -- one applicable object identifier:
          --
          --    unknownChipSet
          --
          -- for use as the value of ifExtnsChipSet when the specific
          -- chip set is unknown.



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          --
          -- This MIB defines the following for use as values of
          -- ifExtnsChipSet:
          -- for use as values of ifExtnsChipSet

             -- Motorola 68824 Token Bus Controller
          chipSetMc68824  OBJECT IDENTIFIER ::= { dot4ChipSets 1 }

          END

6.  Acknowledgements

   This document was produced under the auspices of the IETF's
   Transmission Working Group.  The comments of the following
   individuals are acknowledged:

         Brian Kline, Hughes LAN Systems, Inc.
         Bruce Lieberman, Hughes LAN Systems, Inc.
         Marshall T. Rose, Performance Systems International, Inc.

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
       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 (SNMP), 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



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

  [10] Token-Passing Bus Access Method and Physical Layer
       Specifications, Institute of Electrical and Electronic Engineers,
       IEEE Standard 802.4, May 1988.

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

8.  Security Considerations

   Security issues are not discussed in this memo.

9.  Authors' Addresses

   Keith McCloghrie
   Hughes LAN Systems, Inc.
   1225 Charleston Road
   Mountain View, CA 94043

   Phone: [phone]
   EMail: [e-mail]


   Richard Fox
   Synoptics, Inc.
   4401 Great America Pkwy
   PO Box 58185
   Santa Clara, Cal. 95052

   Phone: [phone]
   EMail: [e-mail]










Transmission Working Group                                     [Page 23]