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rfc:rfc1230

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.

Transmission Working Group [Page 1] RFC 1230 IEEE 802.4 MIB May 1991

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.

Transmission Working Group [Page 2] RFC 1230 IEEE 802.4 MIB May 1991

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:
  1. the 802.4 Operational Table containing state and

operational parameter information which is specific to

      802.4 interfaces;
  1. 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
  1. 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.

Transmission Working Group [Page 3] RFC 1230 IEEE 802.4 MIB May 1991

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
  1. - IEEE 802.4 Token Bus MIB
        IMPORTS
                experimental
                        FROM RFC1155-SMI
                OBJECT-TYPE
                        FROM RFC-1212;
  1. - This MIB Module uses the extended OBJECT-TYPE macro as
  2. - defined in [9].
        dot4    OBJECT IDENTIFIER ::= { experimental 7 }
  1. - All representations of MAC addresses in this MIB Module
  2. - use, as a textual convention (i.e. this convention does
  3. - not affect their encoding), the data type:
        MacAddress ::= OCTET STRING (SIZE (6))    -- a 6 octet
                                                  -- address in the
                                                  -- "canonical" order

Transmission Working Group [Page 4] RFC 1230 IEEE 802.4 MIB May 1991

  1. - defined by IEEE
  2. - 802.1a.
  3. - 16-bit addresses, if needed, are represented by setting
  4. - their upper 4 octets to all 0's, i.e., AAFF would be
  5. - represented as 00000000AAFF.
  1. - This specification follows the 802.4 convention of
  2. - specifying time intervals, which are dependent on the
  3. - bandwidth of the media, in units of octet time. One
  4. - octet time is the time taken to transmit eight bits.
  5. - Representation of such time intervals in this MIB Module
  6. - use, as a textual convention (i.e., this convention does
  7. - not affect their encoding), the data type:
        OctetTime  ::= INTEGER        -- the value of a time
                                      -- interval in units of octet
                                      -- time.
  1. - The 802.4 Operational Table
  1. - This table contains state and parameter information which
  2. - is specific to 802.4 interfaces. It is mandatory that
  3. - systems having 802.4 interfaces implement this table in
  4. - addition to the generic interfaces table [4,6] and its
  5. - 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 }

Transmission Working Group [Page 5] RFC 1230 IEEE 802.4 MIB May 1991

        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

Transmission Working Group [Page 6] RFC 1230 IEEE 802.4 MIB May 1991

                           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),

Transmission Working Group [Page 7] RFC 1230 IEEE 802.4 MIB May 1991

                               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 }

Transmission Working Group [Page 8] RFC 1230 IEEE 802.4 MIB May 1991

        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

Transmission Working Group [Page 9] RFC 1230 IEEE 802.4 MIB May 1991

                   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,

Transmission Working Group [Page 10] RFC 1230 IEEE 802.4 MIB May 1991

                           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 }

Transmission Working Group [Page 11] RFC 1230 IEEE 802.4 MIB May 1991

        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 }
  1. - 802.4 Initialization Table
  1. - This table contains the parameter information used by an
  2. - 802.4 interface as the values to be assigned to its
  3. - operational parameters upon initialization. It is
  4. - mandatory that systems having 802.4 interfaces implement
  5. - this table.
        dot4InitTable  OBJECT-TYPE
                   SYNTAX  SEQUENCE OF Dot4InitEntry
                   ACCESS  not-accessible
                   STATUS  mandatory
                   DESCRIPTION
                           "This table contains Token Bus

Transmission Working Group [Page 12] RFC 1230 IEEE 802.4 MIB May 1991

                           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

Transmission Working Group [Page 13] RFC 1230 IEEE 802.4 MIB May 1991

                           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 }

Transmission Working Group [Page 14] RFC 1230 IEEE 802.4 MIB May 1991

        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."

Transmission Working Group [Page 15] RFC 1230 IEEE 802.4 MIB May 1991

                   ::= { 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 }
  1. - 802.4 Statistics Table
  1. - This table contains Token Bus statistics, one entry per
  2. - 802.4 interface. It is mandatory that systems having
  3. - 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 }

Transmission Working Group [Page 16] RFC 1230 IEEE 802.4 MIB May 1991

        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

Transmission Working Group [Page 17] 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

Transmission Working Group [Page 18] RFC 1230 IEEE 802.4 MIB May 1991

                   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

Transmission Working Group [Page 19] RFC 1230 IEEE 802.4 MIB May 1991

                   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 }
  1. - 802.4 Interface Tests
        dot4Tests         OBJECT IDENTIFIER ::= { dot4 5 }
  1. - The extensions to the interfaces table proposed in [11]
  2. - define a table object, ifExtnsTestTable, through which a
  3. - network manager can instruct an agent to test an interface
  4. - for various faults. A test to be performed is identified
  5. - (as the value of ifExtnsTestType) via an OBJECT IDENTIFIER.
  1. - When a test fails, the object ifExtnsTestCode, defined in
  2. - [11], may contain a media-specific error-code. For 802.4
  3. - interfaces, the following is defined as the value of
  4. - ifExtnsTestCode when a test fails because the modem could
  5. - not be initialized:
        dot4Errors OBJECT IDENTIFIER ::= { dot4 4 }
        dot4ModemInitFailed OBJECT IDENTIFIER ::= { dot4Errors 1 }
  1. - The Full-Duplex Loop Back Test is a common test, defined
  2. - in [11] as:

Transmission Working Group [Page 20] RFC 1230 IEEE 802.4 MIB May 1991

  1. -
  2. - testFullDuplexLoopBack
  3. -
  4. - Invoking this test on a 802.4 interface causes the
  5. - interface to check the path from memory through the chip
  6. - set's serial interface back to memory, thus checking the
  7. - proper functioning of the transmit and receive machines
  8. - of the token bus hardware.
  9. - This test may only be invoked when the interface is
  10. - the Offline state.
  1. - The FIFO Path test is defined by:
        testFifoPath   OBJECT IDENTIFIER ::= { dot4Tests 1 }
  1. - Invoking this test causes the interface to check the path
  2. - from memory to the chip set's FIFO and back to memory.
  3. - This test checks the hosts interface to the token bus
  4. - hardware. This test may only be invoked when the
  5. - interface is the Offline state.
  1. - The External Loopback test is defined by:
        testExternalLoopback OBJECT IDENTIFIER ::= { dot4Tests 2 }
  1. - Invoking this test causes the interface to check the path
  2. - from memory through the chip set and out onto the network
  3. - for external (e.g., at the head-end) loopback through the
  4. - chip set to memory. This test checks the host's interface
  5. - to the 802.4 network. This test is liable to cause
  6. - serious disruption if invoked on an operational network.
  1. - 802.4 Hardware Chip Sets
        dot4ChipSets       OBJECT IDENTIFIER ::= { dot4 6 }
  1. - The extensions to the interfaces table proposed in [11]
  2. - define an object, ifExtnsChipSet, with the syntax of
  3. - OBJECT IDENTIFIER, to identify the hardware chip set in
  4. - use by an interface. That definition specifies just
  5. - one applicable object identifier:
  6. -
  7. - unknownChipSet
  8. -
  9. - for use as the value of ifExtnsChipSet when the specific
  10. - chip set is unknown.

Transmission Working Group [Page 21] RFC 1230 IEEE 802.4 MIB May 1991

  1. -
  2. - This MIB defines the following for use as values of
  3. - ifExtnsChipSet:
  4. - for use as values of ifExtnsChipSet
  1. - 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

Transmission Working Group [Page 22] 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

Transmission Working Group [Page 23]

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