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+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:
+
+      - 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.
+
+
+
+
+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
+
+          --                 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
+
+
+
+Transmission Working Group                                      [Page 4]
+
+RFC 1230                     IEEE 802.4 MIB                     May 1991
+
+
+                                                    -- 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 }
+
+
+
+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 }
+
+
+          -- 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
+
+
+
+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 }
+
+
+          -- 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 }
+
+
+
+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 }
+
+
+          --                      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:
+
+
+
+Transmission Working Group                                     [Page 20]
+
+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.
+
+
+
+Transmission Working Group                                     [Page 21]
+
+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
+
+
+
+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]
+
\ No newline at end of file