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Updated by: 1239 HISTORIC

Network Working Group                                      K. McCloghrie
Request for Comments: 1230                      Hughes LAN Systems, Inc.
                                                                  R. Fox
                                                         Synoptics, Inc.
                                                                May 1991


                        IEEE 802.4 Token Bus MIB

Status of this Memo

   This memo defines a MIB for the IEEE 802.4 Token Bus for use with the
   SNMP protocol.  This memo is a product of the Transmission Working
   Group of the Internet Engineering Task Force (IETF).  This RFC
   specifies an IAB standards track protocol for the Internet community,
   and requests discussion and suggestions for improvements.  Please
   refer to the current edition of the "IAB Official Protocol Standards"
   for the standardization state and status of this protocol.
   Distribution of this memo is unlimited.

Table of Contents

   1. Abstract ..............................................    1
   2. The Network Management Framework.......................    2
   3. Objects ...............................................    2
   3.1 Format of Definitions ................................    3
   4. Overview ..............................................    3
   4.1 Scope of Definitions .................................    3
   4.2 Textual Conventions ..................................    4
   4.3 Optional Objects .....................................    4
   5. Definitions ...........................................    4
   6. Acknowledgements ......................................   22
   7. References ............................................   22
   8. Security Considerations................................   23
   9. Authors' Addresses.....................................   23

1.  Abstract

   This memo defines an experimental portion of the Management
   Information Base (MIB) for use with network management protocols in
   TCP/IP-based internets.  In particular, this memo defines managed
   objects used for managing subnetworks which use the IEEE 802.4 Token
   Bus technology described in 802.4 Token-Passing Bus Access Method and
   Physical Layer Specifications, IEEE Standard 802.4.







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2.  The Network Management Framework

   The Internet-standard Network Management Framework consists of three
   components.  They are:

      RFC 1155 which defines the SMI, the mechanisms used for describing
      and naming objects for the purpose of management.  RFC 1212
      defines a more concise description mechanism, which is wholly
      consistent with the SMI.

      RFC 1156 which defines MIB-I, the core set of managed objects for
      the Internet suite of protocols.  RFC 1213, defines MIB-II, an
      evolution of MIB-I based on implementation experience and new
      operational requirements.

      RFC 1157 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.

3.  Objects

   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.  In particular, each object has a name, a syntax,
   and an encoding.  The name is an object identifier, an
   administratively assigned name, which specifies an object type.  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 OBJECT
   DESCRIPTOR, to also refer to the object type.

   The syntax of an object type defines the abstract data structure
   corresponding to that object type.  The ASN.1 language is used for
   this purpose.  However, the SMI [3] purposely restricts the ASN.1
   constructs which may be used.  These restrictions are explicitly made
   for simplicity.

   The encoding of an object type is simply how that object type is
   represented using the object type's syntax.  Implicitly tied to the
   notion of an object type's syntax and encoding is how the object type
   is represented when being transmitted on the network.

   The SMI specifies the use of the basic encoding rules of ASN.1 [8],
   subject to the additional requirements imposed by the SNMP.




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3.1.  Format of Definitions

   Section 5 contains contains the specification of all object types
   contained in this MIB module.  The object types are defined using the
   conventions defined in the SMI, as amended by the extensions
   specified in [9,10].

4.  Overview

   This memo defines three tables:

      - the 802.4 Operational Table containing state and
        operational parameter information which is specific to
        802.4 interfaces;

      - the 802.4 Initialization Table containing the parameter
        information used by an 802.4 interface as the values to
        be assigned to its operational parameters upon
        initialization; and

      - the 802.4 Statistics Table containing 802.4 interface
        statistics.

   A managed system will have one entry in each of these tables for each
   of its 802.4 interfaces.

   This memo also defines OBJECT IDENTIFIERs, some to identify 802.4
   tests, for use with the ifExtnsTestTable defined in [11], and some to
   identify Token Bus interface Chip Sets, for use with the
   ifExtnsChipSet object defined in [11].

4.1.  Scope of Definitions

   All objects defined in this memo are registered in a single subtree
   within the experimental namespace [3], and are for use with every
   interface which conforms to the IEEE 802.4 Token Bus Access Method
   [10]. At present, this applies to interfaces for which the ifType
   variable in the Internet-standard MIB [4,6] has the value:

      iso88024-tokenBus(8)

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

      dot4    OBJECT IDENTIFIER ::= { experimental 7 }

   as defined below.




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4.2.  Textual Conventions

   Two new datatypes, MacAddress and OctetTime, are introduced as
   textual conventions in this document.  These textual conventions have
   NO effect on either the syntax nor the semantics of any managed
   object. Objects defined using these conventions are always encoded by
   means of the rules that define their primitive type.  Hence, no
   changes to the SMI or the SNMP are necessary to accommodate these
   textual conventions which are adopted merely for the convenience of
   readers and writers in pursuit of the elusive goal of a concise and
   unambiguous specification.

4.3.  Optional Objects

   A few objects are defined in this memo with "optional" status for the
   purpose of allowing experimentation to determine whether they are
   useful or not.  If sufficient consensus is reached in the Internet
   community to result in a subsequent revision of this memo being
   placed in the Internet-standard MIB, then these optional objects will
   either be removed or become mandatory.

5.  Definitions


          RFC1230-MIB DEFINITIONS ::= BEGIN

          --                 IEEE 802.4 Token Bus MIB

          IMPORTS
                  experimental
                          FROM RFC1155-SMI
                  OBJECT-TYPE
                          FROM RFC-1212;

          --  This MIB Module uses the extended OBJECT-TYPE macro as
          --  defined in [9].



          dot4    OBJECT IDENTIFIER ::= { experimental 7 }

          -- All representations of MAC addresses in this MIB Module
          -- use, as a textual convention (i.e. this convention does
          -- not affect their encoding), the data type:

          MacAddress ::= OCTET STRING (SIZE (6))    -- a 6 octet
                                                    -- address in the
                                                    -- "canonical" order



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                                                    -- defined by IEEE
                                                    -- 802.1a.
          -- 16-bit addresses, if needed, are represented by setting
          -- their upper 4 octets to all 0's, i.e., AAFF would be
          -- represented as 00000000AAFF.


          -- This specification follows the 802.4 convention of
          -- specifying time intervals, which are dependent on the
          -- bandwidth of the media, in units of octet time.  One
          -- octet time is the time taken to transmit eight bits.
          -- Representation of such time intervals in this MIB Module
          -- use, as a textual convention (i.e., this convention does
          -- not affect their encoding), the data type:

          OctetTime  ::= INTEGER        -- the value of a time
                                        -- interval in units of octet
                                        -- time.


          -- The 802.4 Operational Table

          -- This table contains state and parameter information which
          -- is specific to 802.4 interfaces.  It is mandatory that
          -- systems having 802.4 interfaces implement this table in
          -- addition to the generic interfaces table [4,6] and its
          -- generic extensions [11].

          dot4Table  OBJECT-TYPE
                     SYNTAX  SEQUENCE OF Dot4Entry
                     ACCESS  not-accessible
                     STATUS  mandatory
                     DESCRIPTION
                             "This table contains Token Bus interface
                             parameters and state variables, one entry
                             per 802.5 interface."

                     ::= { dot4 1 }

          dot4Entry  OBJECT-TYPE
                     SYNTAX  Dot4Entry
                     ACCESS  not-accessible
                     STATUS  mandatory
                     DESCRIPTION
                             "A list of Token Bus status and operational
                             parameter values for an 802.4 interface."
                     INDEX   { dot4IfIndex }
                     ::= { dot4Table 1 }



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          Dot4Entry  ::= SEQUENCE {
                             dot4IfIndex
                                 INTEGER,
                             dot4Options
                                 INTEGER,
                             dot4State
                                 INTEGER,
                             dot4Commands
                                 INTEGER,
                             dot4MacAddrLen
                                 INTEGER,
                             dot4NextStation
                                 MacAddress,
                             dot4PreviousStation
                                 MacAddress,
                             dot4SlotTime
                                 OctetTime,
                             dot4LastTokenRotTime
                                 OctetTime,
                             dot4HiPriTokenHoldTime
                                 OctetTime,
                             dot4TargetRotTimeClass4
                                 OctetTime,
                             dot4TargetRotTimeClass2
                                 OctetTime,
                             dot4TargetRotTimeClass0
                                 OctetTime,
                             dot4TargetRotTimeRingMaint
                                 OctetTime,
                             dot4RingMaintTimerInitValue
                                 OctetTime,
                             dot4MaxInterSolicitCount
                                 INTEGER (16..255),
                             dot4MaxRetries
                                 INTEGER (0..7),
                             dot4MinPostSilencePreambLen
                                 INTEGER,
                             dot4StandardRevision
                                 INTEGER
                         }


          dot4IfIndex  OBJECT-TYPE
                     SYNTAX  INTEGER
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The value of this object identifies the



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                             802.4 interface for which this entry
                             contains management information.  The
                             value of this object for a particular
                             interface has the same value as the
                             ifIndex object, defined in [4,6], for the
                             same interface."
                     ::= { dot4Entry 1 }

          dot4Options OBJECT-TYPE
                     SYNTAX  INTEGER
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The optional parts of the 802.4
                             specification which are in use by this
                             station.  The options of the 802.4
                             specification are represented by the
                             following values:
                                   1 - Priority
                                   2 - Request-With-Response
                             The value of this object is given by the
                             sum of the above representations for
                             those options in use on this interface.
                             The value zero indicates that no options
                             are in use."
                     ::= { dot4Entry 2 }

          dot4State OBJECT-TYPE
                     SYNTAX  INTEGER {
                                 other(1),
                                 offline(2),
                                 outOfRing(3),
                                 enteringRing(4),
                                 inRing(5)
                             }
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The current state of the 802.4
                             interface.  The value of other(1) is
                             used if the state is unknown
                             (e.g., due to an error condition)."
                     ::=   { dot4Entry 3 }

          dot4Commands OBJECT-TYPE
                     SYNTAX  INTEGER {
                                 no-op(1),
                                 enterRing(2),



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                                 exitRing(3),
                                 reset(4),
                                 initialize(5)
                             }
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "Setting this object causes the station
                             to change the state of the interface as
                             indicated by the specified value.  An
                             initialize(5) command causes the
                             interfaceto load its operational
                             parameters from its initialization
                             parameters; the value of
                             dot4InitInRingDesired determines
                             whether the station tries to enter the
                             logical ring immediately.
                                 Note that the 802.4 specification
                             suggests a station remain Offline after a
                             'remote Network Management' reset(4),
                             until a 'local Network Management'
                             initialize(5) is performed.
                                 Setting this object to a value of
                             no-op(1) has no effect.  When read,
                             this object always has the value no-op(1)."
                     ::=  { dot4Entry 4 }

          dot4MacAddrLen OBJECT-TYPE
                     SYNTAX  INTEGER {
                                 sixteenBit(1),
                                 forty-eightBit(2)
                             }
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "This object indicates the size of MAC
                             addresses interpreted by this station."
                     ::= { dot4Entry 5 }

          dot4NextStation OBJECT-TYPE
                     SYNTAX  MacAddress
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The MAC address of this station's
                             successor in the logical ring."
                     ::= { dot4Entry 6 }




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          dot4PreviousStation OBJECT-TYPE
                     SYNTAX  MacAddress
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The source MAC address of the last token
                             addressed to this station."
                     ::= { dot4Entry 7 }

          dot4SlotTime OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The maximum time any station need wait
                             for an immediate MAC-level response from
                             another station.
                             This value must the same in all stations on
                             the 802.4 network."
                     ::= { dot4Entry 8 }

          dot4LastTokenRotTime OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The observed token rotation time for the
                             last token rotation, timed from token
                             arrival to token arrival.  A value of
                             zero indicates that the token is not
                             rotating."
                     ::= { dot4Entry 9 }

          dot4HiPriTokenHoldTime OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The maximum duration for which a station
                             can hold the token to transmit frames of
                             access class 6 (if the priority option is
                             implemented), or of any access class (if
                             the priority option is not implemented)."
                     ::= { dot4Entry 10 }

          dot4TargetRotTimeClass4 OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-only



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                     STATUS  mandatory
                     DESCRIPTION
                             "If the priority scheme is being used,
                             this value specifies a limit on how long
                             a station can transmit frames at access
                             class 4.  The limit is measured from the
                             time the station is able to start
                             transmitting frames at this access class
                             on one rotation, to the time it must stop
                             transmitting frames at this access class
                             on the next rotation.  If the priority
                             scheme is not being used, this object has
                             the value 0."
                     ::= { dot4Entry 11 }

          dot4TargetRotTimeClass2 OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "If the priority scheme is being used,
                             this value specifies a limit on how long
                             a station can transmit frames at access
                             class 2.  The limit is measured from the
                             time the station is able to start
                             transmitting frames at this access
                             class on one rotation, to the time it
                             must stop transmitting frames at this
                             access class on the next rotation.  If
                             the priority scheme is not being used,
                             this object has the value 0."
                     ::= { dot4Entry 12 }

          dot4TargetRotTimeClass0 OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "If the priority scheme is being used,
                             this value specifies a limit on how long
                             a station can transmit frames at access
                             class 0.  The limit is measured from the
                             time the station is able to start
                             transmitting frames at this access
                             class on one rotation, to the time it
                             must stop transmitting frames at this
                             access class on the next rotation.  If
                             the priority scheme is not being used,



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                             this object has the value 0."
                     ::= { dot4Entry 13 }

          dot4TargetRotTimeRingMaint OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "A value used to limit the duration of a
                             token rotation.  If the duration of a
                             token rotation exceeds this value, the
                             station will not open the response window
                             to solicit for a new successor."
                     ::= { dot4Entry 14 }

          dot4RingMaintTimerInitValue OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The value to which the
                             dot4TargetRotTimeRingMaint is set, each
                             time the station enters the ring.
                             A large value will cause the station to
                             solicit successors immediately upon entry
                             to the ring; a value of zero will cause
                             the station to defer this solicitation
                             for at least one token rotation."
                     ::= { dot4Entry 15 }

          dot4MaxInterSolicitCount OBJECT-TYPE
                     SYNTAX  INTEGER (16..255)
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The maximum number of consecutive token
                             rotations without soliciting for a
                             successor.  If this count expires, the
                             station opens the response window to
                             solicit for a successor (providing the
                             duration of the current token rotation
                             has not exceeded
                             dot4TargetRotTimeRingMaint).  The least
                             significant two bits of the count are
                             determined randomly by the station on a
                             per-use basis."
                     ::= { dot4Entry 16 }




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          dot4MaxRetries OBJECT-TYPE
                     SYNTAX  INTEGER (0..7)
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The maximum number of retries of a
                             Request-with-Response (RWR) frame.  If
                             the RWR option is not in use, this object
                             has the value 0."
                     ::= { dot4Entry 17 }

          dot4MinPostSilencePreambLen OBJECT-TYPE
                     SYNTAX  INTEGER
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The minimum number of octets of preamble
                             on the first frame transmitted by this
                             station after a period of 'transmitted'
                             silence."
                     ::= { dot4Entry 18 }

          dot4StandardRevision OBJECT-TYPE
                     SYNTAX  INTEGER {
                                 rev2(2)
                             }
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The Revision number of the 802.4 standard
                             implemented by this station."
                     ::= { dot4Entry 19 }


          -- 802.4 Initialization Table

          -- This table contains the parameter information used by an
          -- 802.4 interface as the values to be assigned to its
          -- operational parameters upon initialization.  It is
          -- mandatory that systems having 802.4 interfaces implement
          -- this table.

          dot4InitTable  OBJECT-TYPE
                     SYNTAX  SEQUENCE OF Dot4InitEntry
                     ACCESS  not-accessible
                     STATUS  mandatory
                     DESCRIPTION
                             "This table contains Token Bus



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                             initialization parameters, one entry per
                             802.4 interface."
                     ::= { dot4 2 }

          dot4InitEntry  OBJECT-TYPE
                     SYNTAX  Dot4InitEntry
                     ACCESS  not-accessible
                     STATUS  mandatory
                     DESCRIPTION
                             "A list of Token Bus initialization
                             parameters for an 802.4 interface."
                     INDEX   { dot4InitIfIndex }
                     ::= { dot4InitTable 1 }

          Dot4InitEntry ::= SEQUENCE {
                                dot4InitIfIndex
                                    INTEGER,
                                dot4InitSlotTime
                                    OctetTime,
                                dot4InitMaxInterSolicitCount
                                    INTEGER (16..255),
                                dot4InitMaxRetries
                                    INTEGER (0..7),
                                dot4InitHiPriTokenHoldTime
                                    OctetTime,
                                dot4InitTargetRotTimeClass4
                                    OctetTime,
                                dot4InitTargetRotTimeClass2
                                    OctetTime,
                                dot4InitTargetRotTimeClass0
                                    OctetTime,
                                dot4InitTargetRotTimeRingMaint
                                    OctetTime,
                                dot4InitRingMaintTimerInitValue
                                    OctetTime,
                                dot4InitMinPostSilencePreambLen
                                    INTEGER,
                                dot4InitInRingDesired
                                    INTEGER
                            }

          dot4InitIfIndex  OBJECT-TYPE
                     SYNTAX  INTEGER
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The value of this object identifies the
                             802.4 interface for which this entry



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                             contains management information.  The
                             value of this object for a particular
                             interface has the same value as the
                             ifIndex object, defined in [4,6], for
                             the same interface."
                     ::= { dot4InitEntry 1 }

          dot4InitSlotTime OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "The value assigned to the object
                             dot4SlotTime when the station is
                             initialized."
                     ::= { dot4InitEntry 2 }

          dot4InitMaxInterSolicitCount OBJECT-TYPE
                     SYNTAX  INTEGER (16..255)
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "The value assigned to the object
                             dot4MaxInterSolicitCount when the station
                             is initialized."
                     ::= { dot4InitEntry 3 }

          dot4InitMaxRetries OBJECT-TYPE
                     SYNTAX  INTEGER (0..7)
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "The value assigned to the object
                             dot4MaxRetries when the station is
                             initialized."
                     ::= { dot4InitEntry 4 }

          dot4InitHiPriTokenHoldTime OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "The value assigned to the object
                             dot4HiPriTokenHoldTime when the station
                             is initialized."
                     ::= { dot4InitEntry 5 }





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          dot4InitTargetRotTimeClass4 OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "The value assigned to the object
                             dot4TargetRotTimeClass4 when the station
                             is initialized."
                     ::= { dot4InitEntry 6 }

          dot4InitTargetRotTimeClass2 OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "The value assigned to the object
                             dot4TargetRotTimeClass2 when the station
                             is initialized."
                     ::= { dot4InitEntry 7 }

          dot4InitTargetRotTimeClass0 OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "The value assigned to the object
                             dot4TargetRotTimeClass0 when the station
                             is initialized."
                     ::= { dot4InitEntry 8 }

          dot4InitTargetRotTimeRingMaint OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "The value assigned to the object
                             dot4TargetRotTimeRingMaint when the station
                             is initialized."
                     ::= { dot4InitEntry 9 }

          dot4InitRingMaintTimerInitValue OBJECT-TYPE
                     SYNTAX  OctetTime
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "The value assigned to the object
                             dot4RingMaintTimerInitValue when the
                             station is initialized."



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                     ::= { dot4InitEntry 10 }

          dot4InitMinPostSilencePreambLen OBJECT-TYPE
                     SYNTAX  INTEGER
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "The value assigned to the object
                             dot4MinPostSilencePreambLen when the
                             station is initialized."
                     ::= { dot4InitEntry 11 }

          dot4InitInRingDesired OBJECT-TYPE
                     SYNTAX INTEGER {
                                inRing(1),
                                outOfRing(2)
                            }
                     ACCESS  read-write
                     STATUS  mandatory
                     DESCRIPTION
                             "This object determines whether the
                             station will attempt to enter the logical
                             ring immediately after initialization."
                     ::= { dot4InitEntry 12 }


          -- 802.4 Statistics Table

          -- This table contains Token Bus statistics, one entry per
          -- 802.4 interface.  It is mandatory that systems having
          -- 802.4 interfaces implement this table.

          dot4StatsTable  OBJECT-TYPE
                     SYNTAX  SEQUENCE OF Dot4StatsEntry
                     ACCESS  not-accessible
                     STATUS  mandatory
                     DESCRIPTION
                             "A table containing Token Bus statistics.
                             All the statistics are defined using the
                             syntax Counter as 32 bit wrap around
                             counters.  Thus, if an interface's
                             hardware chip set maintains these
                             statistics in 16-bit counters, then the
                             agent must read the hardware's counters
                             frequently enough to prevent loss of
                             significance, in order to maintain
                             a 32-bit counter in software."
                     ::= { dot4 3 }



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          dot4StatsEntry  OBJECT-TYPE
                     SYNTAX  Dot4StatsEntry
                     ACCESS  not-accessible
                     STATUS  mandatory
                     DESCRIPTION
                             "An entry containing the 802.4 statistics
                             for a particular interface."
                     INDEX   { dot4StatsIfIndex }
                     ::= { dot4StatsTable 1 }

          Dot4StatsEntry ::= SEQUENCE {
                                  dot4StatsIfIndex
                                     INTEGER,
                                  dot4StatsTokenPasses
                                     Counter,
                                  dot4StatsTokenHeards
                                     Counter,
                                  dot4StatsNoSuccessors
                                     Counter,
                                  dot4StatsWhoFollows
                                     Counter,
                                  dot4StatsTokenPassFails
                                     Counter,
                                  dot4StatsNonSilences
                                     Counter,
                                  dot4StatsFcsErrors
                                     Counter,
                                  dot4StatsEbitErrors
                                     Counter,
                                  dot4StatsFrameFrags
                                     Counter,
                                  dot4StatsFrameTooLongs
                                     Counter,
                                  dot4StatsOverRuns
                                     Counter,
                                  dot4StatsDupAddresses
                                     Counter
                             }

          dot4StatsIfIndex  OBJECT-TYPE
                     SYNTAX  INTEGER
                     ACCESS  read-only
                     STATUS  mandatory
                     DESCRIPTION
                             "The value of this object identifies the
                             802.4 interface for which this entry
                             contains management information.  The
                             value of this object for a particular



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RFC 1230                     IEEE 802.4 MIB                     May 1991


                             interface has the same value as the
                             ifIndex object, defined in [4,6], for the
                             same interface."
                     ::= { dot4StatsEntry 1 }

          dot4StatsTokenPasses OBJECT-TYPE
                     SYNTAX  Counter
                     ACCESS  read-only
                     STATUS  optional
                     DESCRIPTION
                             "The number of times this station has
                             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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RFC 1230                     IEEE 802.4 MIB                     May 1991


          --
          --    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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RFC 1230                     IEEE 802.4 MIB                     May 1991


          --
          -- 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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RFC 1230                     IEEE 802.4 MIB                     May 1991


       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: (415) 966-7934
   EMail: kzm@hls.com


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

   Phone: (408) 764-1372
   EMail: rfox@synoptics.com










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