path: root/doc/rfc/rfc1748.txt

Network Working Group                                      K. McCloghrie
Request for Comments: 1748                                     E. Decker
Obsoletes: 1743, 1231                                cisco Systems, Inc.
Category: Standards Track                                  December 1994


                       IEEE 802.5 MIB using SMIv2

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Table of Contents

   1. Introduction .............................................    1
   2. The SNMPv2 Network Management Framework ..................    2
   2.1 Object Definitions ......................................    2
   3. Overview .................................................    2
   3.1 MAC Addresses ...........................................    3
   3.2 Relationship to RFC 1213 ................................    3
   3.3 Relationship to RFC 1573 ................................    3
   3.3.1 Layering Model ........................................    3
   3.3.2 Virtual Circuits ......................................    3
   3.3.3 ifTestTable ...........................................    3
   3.3.4 ifRcvAddressTable .....................................    4
   3.3.5 ifPhysAddress .........................................    4
   3.3.6 ifType ................................................    4
   4. Definitions ..............................................    4
   5. Acknowledgements .........................................   23
   6. References ...............................................   23
   Appendix A. Changes from RFC 1231 ...........................   24
   Security Considerations .....................................   24
   Authors' Addresses ..........................................   25

1.  Introduction

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, it describes managed objects used for managing
   subnetworks which use the IEEE 802.5 Token Ring technology described
   in 802.5 Token Ring Access Method and Physical Layer Specifications,
   IEEE Standard 802.5-1989 [7].  This memo is a replacement for RFC
   1231.




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2.  The SNMPv2 Network Management Framework

   The SNMPv2 Network Management Framework consists of four major
   components.  They are:

      o    RFC 1442 [1] which defines the SMI, the mechanisms used for
           describing and naming objects for the purpose of management.

      o    STD 17, RFC 1213 [2] defines MIB-II, the core set of managed
           objects for the Internet suite of protocols.

      o    RFC 1445 [3] which defines the administrative and other
           architectural aspects of the framework.

      o    RFC 1448 [4] which defines the protocol used for network
           access to managed objects.

   The Framework permits new objects to be defined for the purpose of
   experimentation and evaluation.

2.1.  Object Definitions

   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)
   defined in the SMI.  In particular, each object type is named by an
   OBJECT IDENTIFIER, an administratively assigned name.  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 descriptor, to refer to the
   object type.

3.  Overview

   This memo defines three tables: the 802.5 Interface Table, which
   contains state and parameter information which is specific to 802.5
   interfaces, the 802.5 Statistics Table, which contains 802.5
   interface statistics, and the 802.5 Timer Table, which contains the
   values of 802.5-defined timers. A managed system will have one entry
   in the 802.5 Interface Table and one entry in the 802.5 Statistics
   Table for each of its 802.5 interfaces.  The 802.5 Timer Table is
   obsolete, but its definition has been retained in this memo for
   backward compatibility.

   This memo also defines OBJECT IDENTIFIERs, some to identify interface
   tests for use with the ifTestTable [6], and some to identify Token
   Ring interface Chip Sets.




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3.1.  MAC Addresses

   All representations of MAC addresses in this MIB Module use the
   MacAddress textual convention [5] for which the address is in the
   "canonical" order defined by IEEE 802.1a, i.e., as if it were
   transmitted least significant bit first, even though 802.5 requires
   MAC addresses to be transmitted most significant bit first.

   16-bit addresses, if needed, are represented by setting their upper 4
   octets to all zeros, i.e., AAFF would be represented as 00000000AAFF.

3.2.  Relationship to RFC 1213

   When this MIB module is used in conjunction with the "old" (i.e.,
   pre-RFC 1573) interfaces group, the relationship between an 802.5
   interface and an interface in the context of the RFC 1213 is one-
   to-one.  That is, the value of an ifIndex object instance for an
   802.5 interface can be directly used to identify corresponding
   instances of the objects defined in this memo.

3.3.  Relationship to RFC 1573

   RFC 1573, the Interface MIB Evolution, requires that any MIB module
   which is an adjunct of the Interface MIB, clarify specific areas
   within the Interface MIB.  These areas were intentionally left vague
   in RFC 1573 to avoid over constraining the MIB module, thereby
   precluding management of certain media-types.

   Section 3.3 of RFC 1573 enumerates several areas which a media-
   specific MIB module must clarify.  Each of these areas is addressed
   in a following subsection.  The implementor is referred to RFC 1573
   in order to understand the general intent of these areas.

3.3.1.  Layering Model

   For the typical usage of this IEEE 802.5 MIB module, there will be no
   sub-layers "above" or "below" the 802.5 interface.  However, this MIB
   module does not preclude such layering.

3.3.2.  Virtual Circuits

   802.5 does not support virtual circuits.

3.3.3.  ifTestTable

   This MIB module defines two tests for 802.5 interfaces: Insertion and
   Loopback.  Implementation of these tests is not required.




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3.3.4.  ifRcvAddressTable

   The ifRcvAddressTable is defined to contains all MAC addresses,
   unicast, multicast (group) and broadcast, for which an interface will
   receive packets.  For 802.5 interfaces, its use includes functional
   addresses. The format of the address, contained in
   ifRcvAddressAddress, is the same as for ifPhysAddress.

   For functional addresses on a particular 802.5 interface, only one
   ifRcvAddressTable entry is required.  That entry is the one for the
   address which has the functional address bit ANDed with the bit mask
   of all functional addresses for which the interface will accept
   frames.

3.3.5.  ifPhysAddress

   For an 802.5 interface, ifPhysAddress contains the interface's IEEE
   MAC address, stored as an octet string of length 6, in IEEE 802.1a
   "canonical" order, i.e., the Group Bit is positioned as the low-order
   bit (0x01) of the first octet.

3.3.6.  ifType

   The objects defined in this memo apply to each interface for which
   the ifType has the value:

                  iso88025-tokenRing(9)

4.  Definitions

TOKENRING-MIB DEFINITIONS ::= BEGIN

IMPORTS
    MODULE-IDENTITY, OBJECT-TYPE, OBJECT-IDENTITY,
    Counter32, Integer32                 FROM SNMPv2-SMI
    transmission                         FROM RFC1213-MIB
    MacAddress,TimeStamp                 FROM SNMPv2-TC
    MODULE-COMPLIANCE, OBJECT-GROUP      FROM SNMPv2-CONF;

dot5 MODULE-IDENTITY
    LAST-UPDATED "9410231150Z"
    ORGANIZATION "IETF Interfaces MIB Working Group"
    CONTACT-INFO
            "        Keith McCloghrie

             Postal: cisco Systems, Inc.
                     170 West Tasman Drive,
                     San Jose, CA 95134-1706



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                     US

              Phone: +1 408 526 5260
              EMail: kzm@cisco.com"
    DESCRIPTION
        "The MIB module for IEEE Token Ring entities."
    ::= { transmission 9 }


--              The 802.5 Interface Table

-- This table contains state and parameter information which
-- is specific to 802.5 interfaces.  It is mandatory that
-- systems having 802.5 interfaces implement this table in
-- addition to the ifTable (see RFCs 1213 and 1573).

dot5Table       OBJECT-TYPE
    SYNTAX      SEQUENCE OF Dot5Entry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This table contains Token Ring interface
            parameters and state variables, one entry
            per 802.5 interface."
    ::= { dot5 1 }

dot5Entry       OBJECT-TYPE
    SYNTAX      Dot5Entry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "A list of Token Ring status and parameter
             values for an 802.5 interface."
    INDEX       { dot5IfIndex }
    ::= { dot5Table 1 }

Dot5Entry ::= SEQUENCE {
     dot5IfIndex              Integer32,
     dot5Commands             INTEGER,
     dot5RingStatus           INTEGER,
     dot5RingState            INTEGER,
     dot5RingOpenStatus       INTEGER,
     dot5RingSpeed            INTEGER,
     dot5UpStream             MacAddress,
     dot5ActMonParticipate    INTEGER,
     dot5Functional           MacAddress,
     dot5LastBeaconSent       TimeStamp
}



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dot5IfIndex     OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The value of this object identifies the
             802.5 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 MIB-II for
             the same interface."
    ::= { dot5Entry 1 }

dot5Commands    OBJECT-TYPE
    SYNTAX      INTEGER {
                    noop(1),
                    open(2),
                    reset(3),
                    close(4)
                }
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
            "When this object is set to the value of
             open(2), the station should go into the
             open state.  The progress and success of
             the open is given by the values of the
             objects dot5RingState and
             dot5RingOpenStatus.
                 When this object is set to the value
             of reset(3), then the station should do
             a reset.  On a reset, all MIB counters
             should retain their values, if possible.
             Other side affects are dependent on the
             hardware chip set.
                 When this object is set to the value
             of close(4), the station should go into
             the stopped state by removing itself
             from the ring.
                 Setting this object to a value of
             noop(1) has no effect.
                 When read, this object always has a
             value of noop(1).
                 The open(2) and close(4) values
             correspond to the up(1) and down(2) values
             of MIB-II's ifAdminStatus and ifOperStatus,
             i.e., the setting of ifAdminStatus and



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             dot5Commands affects the values of both
             dot5Commands and ifOperStatus."
    ::= { dot5Entry 2 }

dot5RingStatus  OBJECT-TYPE
    SYNTAX      INTEGER (0..262143)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The current interface status which can
            be used to diagnose fluctuating problems
            that can occur on token rings, after a
            station has successfully been added to
            the ring.
               Before an open is completed, this
            object has the value for the 'no status'
            condition.  The dot5RingState and
            dot5RingOpenStatus objects provide for
            debugging problems when the station
            can not even enter the ring.
                The object's value is a sum of
            values, one for each currently applicable
            condition.  The following values are
            defined for various conditions:

                    0 = No Problems detected
                   32 = Ring Recovery
                   64 = Single Station
                  256 = Remove Received
                  512 = reserved
                 1024 = Auto-Removal Error
                 2048 = Lobe Wire Fault
                 4096 = Transmit Beacon
                 8192 = Soft Error
                16384 = Hard Error
                32768 = Signal Loss
               131072 = no status, open not completed."
    ::= { dot5Entry 3 }

dot5RingState   OBJECT-TYPE
    SYNTAX      INTEGER {
                    opened(1),
                    closed(2),
                    opening(3),
                    closing(4),
                    openFailure(5),
                    ringFailure(6)
                }



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    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The current interface state with respect
            to entering or leaving the ring."
    ::= { dot5Entry 4 }

dot5RingOpenStatus  OBJECT-TYPE
    SYNTAX      INTEGER {
                    noOpen(1),     -- no open attempted
                    badParam(2),
                    lobeFailed(3),
                    signalLoss(4),
                    insertionTimeout(5),
                    ringFailed(6),
                    beaconing(7),
                    duplicateMAC(8),
                    requestFailed(9),
                    removeReceived(10),
                    open(11)      -- last open successful
                }
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "This object indicates the success, or the
            reason for failure, of the station's most
            recent attempt to enter the ring."
    ::= { dot5Entry 5 }

dot5RingSpeed   OBJECT-TYPE
    SYNTAX      INTEGER {
                    unknown(1),
                    oneMegabit(2),
                    fourMegabit(3),
                    sixteenMegabit(4)
                }
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
            "The ring-speed at the next insertion into
            the ring.  Note that this may or may not be
            different to the current ring-speed which is
            given by MIB-II's ifSpeed.  For interfaces
            which do not support changing ring-speed,
            dot5RingSpeed can only be set to its current
            value.  When dot5RingSpeed has the value
            unknown(1), the ring's actual ring-speed is
            to be used."



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    ::= { dot5Entry 6 }

dot5UpStream    OBJECT-TYPE
    SYNTAX      MacAddress
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The MAC-address of the up stream neighbor
             station in the ring."
    ::= { dot5Entry 7 }

dot5ActMonParticipate OBJECT-TYPE
    SYNTAX      INTEGER {
                    true(1),
                    false(2)
                }
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
            "If this object has a value of true(1) then
            this interface will participate in the
            active monitor selection process.  If the
            value is false(2) then it will not.
            Setting this object does not take effect
            until the next Active Monitor election, and
            might not take effect until the next time
            the interface is opened."
    ::= { dot5Entry 8 }

dot5Functional  OBJECT-TYPE
    SYNTAX      MacAddress
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
            "The bit mask of all Token Ring functional
            addresses for which this interface will
            accept frames."
    ::= { dot5Entry 9 }

dot5LastBeaconSent OBJECT-TYPE
    SYNTAX      TimeStamp
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The value of MIB-II's sysUpTime object at which
            the local system last transmitted a Beacon frame
            on this interface."
    ::= { dot5Entry 10 }



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--   The 802.5 Statistics Table

-- This table contains statistics and error counter which are
-- specific to 802.5 interfaces.  It is mandatory that systems
-- having 802.5 interfaces implement this table.

dot5StatsTable  OBJECT-TYPE
    SYNTAX      SEQUENCE OF Dot5StatsEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "A table containing Token Ring statistics,
            one entry per 802.5 interface.
                All the statistics are defined using
            the syntax Counter32 as 32-bit wrap around
            counters.  Thus, if an interface's
            hardware 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 32-bit counters in software."
    ::= { dot5 2 }

dot5StatsEntry  OBJECT-TYPE
    SYNTAX      Dot5StatsEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "An entry contains the 802.5 statistics
             for a particular interface."
    INDEX       { dot5StatsIfIndex }
    ::= { dot5StatsTable 1 }


Dot5StatsEntry ::= SEQUENCE {
     dot5StatsIfIndex              Integer32,
     dot5StatsLineErrors           Counter32,
     dot5StatsBurstErrors          Counter32,
     dot5StatsACErrors             Counter32,
     dot5StatsAbortTransErrors     Counter32,
     dot5StatsInternalErrors       Counter32,
     dot5StatsLostFrameErrors      Counter32,
     dot5StatsReceiveCongestions   Counter32,
     dot5StatsFrameCopiedErrors    Counter32,
     dot5StatsTokenErrors          Counter32,
     dot5StatsSoftErrors           Counter32,
     dot5StatsHardErrors           Counter32,
     dot5StatsSignalLoss           Counter32,



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     dot5StatsTransmitBeacons      Counter32,
     dot5StatsRecoverys            Counter32,
     dot5StatsLobeWires            Counter32,
     dot5StatsRemoves              Counter32,
     dot5StatsSingles              Counter32,
     dot5StatsFreqErrors           Counter32
}


dot5StatsIfIndex  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The value of this object identifies the
            802.5 interface for which this entry
            contains management information.  The
            value of this object for a particular
            interface has the same value as MIB-II's
            ifIndex object for the same interface."
    ::= { dot5StatsEntry 1 }

dot5StatsLineErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "This counter is incremented when a frame
            or token is copied or repeated by a
            station, the E bit is zero in the frame
            or token and one of the following
            conditions exists: 1) there is a
            non-data bit (J or K bit) between the SD
            and the ED of the frame or token, or
            2) there is an FCS error in the frame."
    ::= { dot5StatsEntry 2 }

dot5StatsBurstErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "This counter is incremented when a station
            detects the absence of transitions for five
            half-bit timers (burst-five error)."
    ::= { dot5StatsEntry 3 }





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dot5StatsACErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "This counter is incremented when a station
            receives an AMP or SMP frame in which A is
            equal to C is equal to 0, and then receives
            another SMP frame with A is equal to C is
            equal to 0 without first receiving an AMP
            frame. It denotes a station that cannot set
            the AC bits properly."
    ::= { dot5StatsEntry 4 }

dot5StatsAbortTransErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "This counter is incremented when a station
            transmits an abort delimiter while
            transmitting."
    ::= { dot5StatsEntry 5 }

dot5StatsInternalErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "This counter is incremented when a station
            recognizes an internal error."
    ::= { dot5StatsEntry 6 }

dot5StatsLostFrameErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "This counter is incremented when a station
            is transmitting and its TRR timer expires.
            This condition denotes a condition where a
            transmitting station in strip mode does not
            receive the trailer of the frame before the
            TRR timer goes off."
    ::= { dot5StatsEntry 7 }






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dot5StatsReceiveCongestions OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "This counter is incremented when a station
            recognizes a frame addressed to its
            specific address, but has no available
            buffer space indicating that the station
            is congested."
    ::= { dot5StatsEntry 8 }

dot5StatsFrameCopiedErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "This counter is incremented when a station
            recognizes a frame addressed to its
            specific address and detects that the FS
            field A bits are set to 1 indicating a
            possible line hit or duplicate address."
    ::= { dot5StatsEntry 9 }

dot5StatsTokenErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "This counter is incremented when a station
            acting as the active monitor recognizes an
            error condition that needs a token
            transmitted."
    ::= { dot5StatsEntry 10 }

dot5StatsSoftErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of Soft Errors the interface
            has detected. It directly corresponds to
            the number of Report Error MAC frames
            that this interface has transmitted.
            Soft Errors are those which are
            recoverable by the MAC layer protocols."
    ::= { dot5StatsEntry 11 }




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dot5StatsHardErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of times this interface has
            detected an immediately recoverable
            fatal error.  It denotes the number of
            times this interface is either
            transmitting or receiving beacon MAC
            frames."
    ::= { dot5StatsEntry 12 }

dot5StatsSignalLoss OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of times this interface has
            detected the loss of signal condition from
            the ring."
    ::= { dot5StatsEntry 13 }

dot5StatsTransmitBeacons OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of times this interface has
            transmitted a beacon frame."
    ::= { dot5StatsEntry 14 }

dot5StatsRecoverys OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of Claim Token MAC frames
            received or transmitted after the interface
            has received a Ring Purge MAC frame.  This
            counter signifies the number of times the
            ring has been purged and is being recovered
            back into a normal operating state."
    ::= { dot5StatsEntry 15 }

dot5StatsLobeWires OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only



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    STATUS      current
    DESCRIPTION
            "The number of times the interface has
            detected an open or short circuit in the
            lobe data path.  The adapter will be closed
            and dot5RingState will signify this
            condition."
    ::= { dot5StatsEntry 16 }

dot5StatsRemoves OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of times the interface has
            received a Remove Ring Station MAC frame
            request.  When this frame is received
            the interface will enter the close state
            and dot5RingState will signify this
            condition."
    ::= { dot5StatsEntry 17 }

dot5StatsSingles OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of times the interface has
            sensed that it is the only station on the
            ring.  This will happen if the interface
            is the first one up on a ring, or if
            there is a hardware problem."
    ::= { dot5StatsEntry 18 }

dot5StatsFreqErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of times the interface has
            detected that the frequency of the
            incoming signal differs from the expected
            frequency by more than that specified by
            the IEEE 802.5 standard."
    ::= { dot5StatsEntry 19 }






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-- The Timer Table

-- This group contains the values of timers for 802.5
-- interfaces.  This table is obsolete, but its definition
-- is retained here for backwards compatibility.

dot5TimerTable  OBJECT-TYPE
    SYNTAX      SEQUENCE OF Dot5TimerEntry
    MAX-ACCESS  not-accessible
    STATUS      obsolete
    DESCRIPTION
            "This table contains Token Ring interface
            timer values, one entry per 802.5
            interface."
    ::= { dot5 5 }

dot5TimerEntry  OBJECT-TYPE
    SYNTAX      Dot5TimerEntry
    MAX-ACCESS  not-accessible
    STATUS      obsolete
    DESCRIPTION
            "A list of Token Ring timer values for an
            802.5 interface."
    INDEX       { dot5TimerIfIndex }
    ::= { dot5TimerTable 1 }

Dot5TimerEntry ::= SEQUENCE {
    dot5TimerIfIndex          Integer32,
    dot5TimerReturnRepeat     Integer32,
    dot5TimerHolding          Integer32,
    dot5TimerQueuePDU         Integer32,
    dot5TimerValidTransmit    Integer32,
    dot5TimerNoToken          Integer32,
    dot5TimerActiveMon        Integer32,
    dot5TimerStandbyMon       Integer32,
    dot5TimerErrorReport      Integer32,
    dot5TimerBeaconTransmit   Integer32,
    dot5TimerBeaconReceive    Integer32
}

dot5TimerIfIndex  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "The value of this object identifies the
             802.5 interface for which this entry
             contains timer values.  The value of



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             this object for a particular interface
             has the same value as MIB-II's ifIndex
             object for the same interface."
    ::= { dot5TimerEntry 1 }

dot5TimerReturnRepeat  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "The time-out value used to ensure the
            interface will return to Repeat State, in
            units of 100 micro-seconds.  The value
            should be greater than the maximum ring
            latency."
    ::= { dot5TimerEntry 2 }

dot5TimerHolding  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "Maximum period of time a station is
            permitted to transmit frames after capturing
            a token, in units of 100 micro-seconds."
    ::= { dot5TimerEntry 3 }

dot5TimerQueuePDU  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "The time-out value for enqueuing of an SMP
            PDU after reception of an AMP or SMP
            frame in which the A and C bits were
            equal to 0, in units of 100
            micro-seconds."
    ::= { dot5TimerEntry 4 }

dot5TimerValidTransmit OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "The time-out value used by the active
            monitor to detect the absence of valid
            transmissions, in units of 100
            micro-seconds."



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    ::= { dot5TimerEntry 5 }

dot5TimerNoToken  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "The time-out value used to recover from
            various-related error situations.
            If N is the maximum number of stations on
            the ring, the value of this timer is
            normally:
            dot5TimerReturnRepeat + N*dot5TimerHolding."
    ::= { dot5TimerEntry 6 }

dot5TimerActiveMon  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "The time-out value used by the active
            monitor to stimulate the enqueuing of an
            AMP PDU for transmission, in units of
            100 micro-seconds."
    ::= { dot5TimerEntry 7 }

dot5TimerStandbyMon  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "The time-out value used by the stand-by
            monitors to ensure that there is an active
            monitor on the ring and to detect a
            continuous stream of tokens, in units of
            100 micro-seconds."
    ::= { dot5TimerEntry 8 }

dot5TimerErrorReport  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "The time-out value which determines how
            often a station shall send a Report Error
            MAC frame to report its error counters,
            in units of 100 micro-seconds."
    ::= { dot5TimerEntry 9 }



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dot5TimerBeaconTransmit  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "The time-out value which determines how
            long a station shall remain in the state
            of transmitting Beacon frames before
            entering the Bypass state, in units of
            100 micro-seconds."
    ::= { dot5TimerEntry 10 }

dot5TimerBeaconReceive  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      obsolete
    DESCRIPTION
            "The time-out value which determines how
            long a station shall receive Beacon
            frames from its downstream neighbor
            before entering the Bypass state, in
            units of 100 micro-seconds."
    ::= { dot5TimerEntry 11 }


--                802.5 Interface Tests

dot5Tests   OBJECT IDENTIFIER ::= { dot5 3 }

-- RFC 1573 defines the ifTestTable, through which a
-- network manager can instruct an agent to test an interface
-- for various faults.  A test to be performed is identified
-- as an OBJECT IDENTIFIER.

-- The Insert Function test

dot5TestInsertFunc  OBJECT-IDENTITY
    STATUS       current
    DESCRIPTION
        "Invoking this test causes the station to test the insert
        ring logic of the hardware if the station's lobe media
        cable is connected to a wiring concentrator.  Note that
        this command inserts the station into the network, and
        thus, could cause problems if the station is connected
        to a operational network."
    ::= { dot5Tests 1 }





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-- The Full-Duplex Loop Back test

dot5TestFullDuplexLoopBack OBJECT-IDENTITY
    STATUS       current
    DESCRIPTION
        "Invoking this test on a 802.5 interface causes the
        interface to check the path from memory through the
        chip set's internal logic and back to memory, thus
        checking the proper functioning of the system's
        interface to the chip set."
    ::= { dot5Tests 2 }


--              802.5 Hardware Chip Sets

-- RFC 1229 specified an object, ifExtnsChipSet, with the
-- syntax of OBJECT IDENTIFIER, to identify the hardware
-- chip set in use by an interface.  RFC 1573 obsoletes
-- the use of ifExtnsChipSet.  However, the following
-- definitions are retained for backwards compatibility.

dot5ChipSets   OBJECT IDENTIFIER ::= { dot5 4 }

dot5ChipSetIBM16  OBJECT-IDENTITY
    STATUS        current
    DESCRIPTION
        "IBM's 16/4 Mbs chip set."
    ::= { dot5ChipSets 1 }

dot5ChipSetTItms380 OBJECT-IDENTITY
    STATUS        current
    DESCRIPTION
        "Texas Instruments' TMS 380 4Mbs chip-set"
    ::= { dot5ChipSets 2 }

dot5ChipSetTItms380c16 OBJECT-IDENTITY
    STATUS        current
    DESCRIPTION
        "Texas Instruments' TMS 380C16 16/4 Mbs chip-set"
    ::= { dot5ChipSets 3 }











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-- conformance information

dot5Conformance OBJECT IDENTIFIER ::= { dot5 6 }

dot5Groups      OBJECT IDENTIFIER ::= { dot5Conformance 1 }
dot5Compliances OBJECT IDENTIFIER ::= { dot5Conformance 2 }


-- compliance statements

dot5Compliance MODULE-COMPLIANCE
    STATUS  current
    DESCRIPTION
        "The compliance statement for SNMPv2 entities
        which implement the IEEE 802.5 MIB."

    MODULE  -- this module
        MANDATORY-GROUPS { dot5StateGroup, dot5StatsGroup }

        OBJECT     dot5ActMonParticipate
        MIN-ACCESS read-only
        DESCRIPTION
            "Write access is not required."

        OBJECT     dot5Functional
        MIN-ACCESS read-only
        DESCRIPTION
            "Write access is not required."

    ::= { dot5Compliances 1 }


-- units of conformance

dot5StateGroup  OBJECT-GROUP
    OBJECTS   { dot5Commands, dot5RingStatus, dot5RingState,
                dot5RingOpenStatus, dot5RingSpeed, dot5UpStream,
                dot5ActMonParticipate, dot5Functional,
                dot5LastBeaconSent
              }
    STATUS    current
    DESCRIPTION
        "A collection of objects providing state information
        and parameters for IEEE 802.5 interfaces."
    ::= { dot5Groups 1 }

dot5StatsGroup  OBJECT-GROUP
    OBJECTS   { dot5StatsLineErrors, dot5StatsBurstErrors,



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                dot5StatsACErrors, dot5StatsAbortTransErrors,
                dot5StatsInternalErrors, dot5StatsLostFrameErrors,
                dot5StatsReceiveCongestions,
                dot5StatsFrameCopiedErrors, dot5StatsTokenErrors,
                dot5StatsSoftErrors, dot5StatsHardErrors,
                dot5StatsSignalLoss, dot5StatsTransmitBeacons,
                dot5StatsRecoverys, dot5StatsLobeWires,
                dot5StatsRemoves, dot5StatsSingles,
                dot5StatsFreqErrors
              }
    STATUS    current
    DESCRIPTION
        "A collection of objects providing statistics for
        IEEE 802.5 interfaces."
    ::= { dot5Groups 2 }

END


































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5.  Acknowledgements

   The changes from RFC 1231 are the result of discussions on the IETF's
   snmp mailing-list and in the Interfaces MIB Working Group.

6.  References

   [1] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Structure
       of Management Information for version 2 of the Simple Network
       Management Protocol (SNMPv2)", RFC 1442, SNMP Research,Inc.,
       Hughes LAN Systems, Dover Beach Consulting, Inc., Carnegie Mellon
       University, April 1993.

   [2] McCloghrie, K., and M. Rose, Editors, "Management Information
       Base for Network Management of TCP/IP-based internets: MIB-II",
       STD 17, RFC 1213, Hughes LAN Systems, Performance Systems
       International, March 1991.

   [3] Galvin, J., and K. McCloghrie, "Administrative Model for version
       2 of the Simple Network Management Protocol (SNMPv2)", RFC 1445,
       Trusted Information Systems, Hughes LAN Systems, April 1993.

   [4] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol
       Operations for version 2 of the Simple Network Management
       Protocol (SNMPv2)", RFC 1448, SNMP Research,Inc., Hughes LAN
       Systems, Dover Beach Consulting, Inc., Carnegie Mellon
       University, April 1993.

   [5] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Textual
       Conventions for version 2 of the Simple Network Management
       Protocol (SNMPv2)", RFC 1443, SNMP Research,Inc., Hughes LAN
       Systems, Dover Beach Consulting, Inc., Carnegie Mellon
       University, April 1993.

   [6] McCloghrie, K., and F. Kastenholz, "Evolution of the Interfaces
       Group of MIB-II", RFC 1573, Hughes LAN Systems, FTP Software, Jan
       1994

   [7] Institute of Electrical and Electronic Engineers, "Token Ring
       Access Method and Physical Layer Specifications", IEEE Standard
       802.5-1989, 1989.










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APPENDIX A - Changes from RFC 1231

   This memo has the following differences from RFC 1231:

   (1)  This memo is formatted using the SNMPv2 SMI.

   (2)  The relationship of the "open" and "close" states of
        dot5Commands to the value of ifAdminStatus has been
        clarified.  In particular, the setting of one affects the
        value of the other.

   (3)  The relationship dot5RingSpeed and ifSpeed has been
        clarified.  In particular, ifSpeed indicates the current
        ring-speed; dot5RingSpeed indicates the ring-speed at the
        next insertion into the ring.  If the interface doesn't
        support changing ring-speed, then dot5RingSpeed can only be
        set to its current value.  When dot5RingSpeed has the value
        'unknown(1)', the ring-speed is to be set to the ring's
        actual ring-speed.

   (4)  Write-access to dot5ActMonParticipate is not required, and a
        change to the value of dot5ActMonParticipate does not take
        effect until the next Active Monitor election.

   (5)  Write-access to dot5Functional is not required.

   (6)  A new object, dot5LastBeaconSent has been defined to contain
        the timestamp of the last beacon frame sent.

   (7)  The dot5TimerTable has been designated as obsolete.

   (8)  Text has been added describing the applicability of RFC 1573
        [6] to 802.5 interfaces.

   (9)  Other minor editorial changes.

Security Considerations

   Security issues are not discussed in this memo.












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Authors' Addresses

   Keith McCloghrie
   cisco Systems, Inc.
   170 West Tasman Drive,
   San Jose, CA 95134-1706

   Phone: (408) 526-5260
   EMail: kzm@cisco.com


   Eric B. Decker
   cisco Systems, Inc.
   1525 O'Brien Dr.
   Menlo Park, CA 94025

   Phone: (415) 688-8241
   EMail: cire@cisco.com

































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