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✏️ Editing: BRIDGE-MIB.txt

BRIDGE-MIB DEFINITIONS ::= BEGIN

-- ---------------------------------------------------------- --
-- MIB for IEEE 802.1D devices
-- ---------------------------------------------------------- --
IMPORTS
    MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE,
    Counter32, Integer32, TimeTicks, mib-2
        FROM SNMPv2-SMI
    TEXTUAL-CONVENTION, MacAddress
        FROM SNMPv2-TC
    MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP
        FROM SNMPv2-CONF
    InterfaceIndex FROM IF-MIB
    ;

dot1dBridge MODULE-IDENTITY
    LAST-UPDATED "200509190000Z"
    ORGANIZATION "IETF Bridge MIB Working Group"
    CONTACT-INFO
        "Email: bridge-mib@ietf.org

K.C. Norseth (Editor)
                 L-3 Communications
            Tel: +1 801-594-2809
          Email: kenyon.c.norseth@L-3com.com
         Postal: 640 N. 2200 West.
                 Salt Lake City, Utah 84116-0850

Les Bell (Editor)
                 3Com Europe Limited
          Phone: +44 1442 438025
          Email: elbell@ntlworld.com
         Postal: 3Com Centre, Boundary Way
                 Hemel Hempstead
                 Herts.  HP2 7YU
                 UK

Send comments to <bridge-mib@ietf.org>"
    DESCRIPTION
        "The Bridge MIB module for managing devices that support
        IEEE 802.1D.

Copyright (C) The Internet Society (2005).  This version of
        this MIB module is part of RFC 4188; see the RFC itself for
        full legal notices."
    REVISION     "200509190000Z"
    DESCRIPTION
         "Third revision, published as part of RFC 4188.

The MIB module has been converted to SMIv2 format.
         Conformance statements have been added and some
         description and reference clauses have been updated.

The object dot1dStpPortPathCost32 was added to
         support IEEE 802.1t and the permissible values of
         dot1dStpPriority and dot1dStpPortPriority have been
         clarified for bridges supporting IEEE 802.1t or
         IEEE 802.1w.

The interpretation of dot1dStpTimeSinceTopologyChange
         has been clarified for bridges supporting the Rapid
         Spanning Tree Protocol (RSTP)."
    REVISION     "199307310000Z"
    DESCRIPTION
         "Second revision, published as part of RFC 1493."
    REVISION     "199112310000Z"
    DESCRIPTION
         "Initial revision, published as part of RFC 1286."
    ::= { mib-2 17 }

-- ---------------------------------------------------------- --
-- Textual Conventions
-- ---------------------------------------------------------- --

BridgeId ::= TEXTUAL-CONVENTION
    STATUS      current
    DESCRIPTION
        "The Bridge-Identifier, as used in the Spanning Tree
        Protocol, to uniquely identify a bridge.  Its first two
        octets (in network byte order) contain a priority value,
        and its last 6 octets contain the MAC address used to
        refer to a bridge in a unique fashion (typically, the
        numerically smallest MAC address of all ports on the
        bridge)."
    SYNTAX      OCTET STRING (SIZE (8))

Timeout ::= TEXTUAL-CONVENTION
    DISPLAY-HINT "d"
    STATUS      current
    DESCRIPTION
        "A Spanning Tree Protocol (STP) timer in units of 1/100
        seconds.  Several objects in this MIB module represent
        values of timers used by the Spanning Tree Protocol.
        In this MIB, these timers have values in units of
        hundredths of a second (i.e., 1/100 secs).

These timers, when stored in a Spanning Tree Protocol's
        BPDU, are in units of 1/256 seconds.  Note, however, that
        802.1D-1998 specifies a settable granularity of no more
        than one second for these timers.  To avoid ambiguity,
        a conversion algorithm is defined below for converting
        between the different units, which ensures a timer's
        value is not distorted by multiple conversions.

To convert a Timeout value into a value in units of
        1/256 seconds, the following algorithm should be used:

b = floor( (n * 256) / 100)

where:
            floor   =  quotient [ignore remainder]
            n is the value in 1/100 second units
            b is the value in 1/256 second units

To convert the value from 1/256 second units back to
        1/100 seconds, the following algorithm should be used:

n = ceiling( (b * 100) / 256)

where:
            ceiling = quotient [if remainder is 0], or
                      quotient + 1 [if remainder is nonzero]
            n is the value in 1/100 second units

b is the value in 1/256 second units

Note: it is important that the arithmetic operations are
        done in the order specified (i.e., multiply first,
        divide second)."
    SYNTAX      Integer32

-- ---------------------------------------------------------- --
-- subtrees in the Bridge MIB
-- ---------------------------------------------------------- --

dot1dNotifications  OBJECT IDENTIFIER ::= { dot1dBridge 0 }

dot1dBase           OBJECT IDENTIFIER ::= { dot1dBridge 1 }
dot1dStp            OBJECT IDENTIFIER ::= { dot1dBridge 2 }

dot1dSr             OBJECT IDENTIFIER ::= { dot1dBridge 3 }
-- documented in RFC 1525

dot1dTp             OBJECT IDENTIFIER ::= { dot1dBridge 4 }
dot1dStatic         OBJECT IDENTIFIER ::= { dot1dBridge 5 }

-- Subtrees used by Bridge MIB Extensions:
--      pBridgeMIB  MODULE-IDENTITY   ::= { dot1dBridge 6 }
--      qBridgeMIB  MODULE-IDENTITY   ::= { dot1dBridge 7 }
-- Note that the practice of registering related MIB modules
-- below dot1dBridge has been discouraged since there is no
-- robust mechanism to track such registrations.

dot1dConformance    OBJECT IDENTIFIER ::= { dot1dBridge 8 }

-- ---------------------------------------------------------- --
-- the dot1dBase subtree
-- ---------------------------------------------------------- --
-- Implementation of the dot1dBase subtree is mandatory for all
-- bridges.
-- ---------------------------------------------------------- --

dot1dBaseBridgeAddress OBJECT-TYPE
    SYNTAX      MacAddress
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The MAC address used by this bridge when it must be
        referred to in a unique fashion.  It is recommended
        that this be the numerically smallest MAC address of
        all ports that belong to this bridge.  However, it is only

required to be unique.  When concatenated with
        dot1dStpPriority, a unique BridgeIdentifier is formed,
        which is used in the Spanning Tree Protocol."
    REFERENCE
        "IEEE 802.1D-1998: clauses 14.4.1.1.3 and 7.12.5"
    ::= { dot1dBase 1 }

dot1dBaseNumPorts OBJECT-TYPE
    SYNTAX      Integer32
    UNITS       "ports"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of ports controlled by this bridging
        entity."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.4.1.1.3"
    ::= { dot1dBase 2 }

dot1dBaseType OBJECT-TYPE
    SYNTAX      INTEGER {
                    unknown(1),
                    transparent-only(2),
                    sourceroute-only(3),
                    srt(4)
                }
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "Indicates what type of bridging this bridge can
        perform.  If a bridge is actually performing a
        certain type of bridging, this will be indicated by
        entries in the port table for the given type."
    ::= { dot1dBase 3 }

-- ---------------------------------------------------------- --
-- The Generic Bridge Port Table
-- ---------------------------------------------------------- --
dot1dBasePortTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF Dot1dBasePortEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A table that contains generic information about every
        port that is associated with this bridge.  Transparent,
        source-route, and srt ports are included."
    ::= { dot1dBase 4 }

dot1dBasePortEntry OBJECT-TYPE
    SYNTAX      Dot1dBasePortEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A list of information for each port of the bridge."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.4.2, 14.6.1"
    INDEX  { dot1dBasePort }
    ::= { dot1dBasePortTable 1 }

Dot1dBasePortEntry ::=
    SEQUENCE {
        dot1dBasePort
            Integer32,
        dot1dBasePortIfIndex
            InterfaceIndex,
        dot1dBasePortCircuit
            OBJECT IDENTIFIER,
        dot1dBasePortDelayExceededDiscards
            Counter32,
        dot1dBasePortMtuExceededDiscards
            Counter32
    }

dot1dBasePort OBJECT-TYPE
    SYNTAX      Integer32 (1..65535)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The port number of the port for which this entry
        contains bridge management information."
    ::= { dot1dBasePortEntry 1 }

dot1dBasePortIfIndex OBJECT-TYPE
    SYNTAX      InterfaceIndex
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The value of the instance of the ifIndex object,
        defined in IF-MIB, for the interface corresponding
        to this port."
    ::= { dot1dBasePortEntry 2 }

dot1dBasePortCircuit OBJECT-TYPE
    SYNTAX      OBJECT IDENTIFIER
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "For a port that (potentially) has the same value of
        dot1dBasePortIfIndex as another port on the same bridge.
        This object contains the name of an object instance
        unique to this port.  For example, in the case where
        multiple ports correspond one-to-one with multiple X.25
        virtual circuits, this value might identify an (e.g.,
        the first) object instance associated with the X.25
        virtual circuit corresponding to this port.

For a port which has a unique value of
        dot1dBasePortIfIndex, this object can have the value
        { 0 0 }."
    ::= { dot1dBasePortEntry 3 }

dot1dBasePortDelayExceededDiscards OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of frames discarded by this port due
        to excessive transit delay through the bridge.  It
        is incremented by both transparent and source
        route bridges."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.6.1.1.3"
    ::= { dot1dBasePortEntry 4 }

dot1dBasePortMtuExceededDiscards OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of frames discarded by this port due
        to an excessive size.  It is incremented by both
        transparent and source route bridges."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.6.1.1.3"
    ::= { dot1dBasePortEntry 5 }

-- ---------------------------------------------------------- --
-- the dot1dStp subtree
-- ---------------------------------------------------------- --
-- Implementation of the dot1dStp subtree is optional.  It is
-- implemented by those bridges that support the Spanning Tree
-- Protocol.
-- ---------------------------------------------------------- --

dot1dStpProtocolSpecification OBJECT-TYPE
    SYNTAX      INTEGER {
                    unknown(1),
                    decLb100(2),
                    ieee8021d(3)
                }
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "An indication of what version of the Spanning Tree
        Protocol is being run.  The value 'decLb100(2)'
        indicates the DEC LANbridge 100 Spanning Tree protocol.
        IEEE 802.1D implementations will return 'ieee8021d(3)'.
        If future versions of the IEEE Spanning Tree Protocol
        that are incompatible with the current version
        are released a new value will be defined."
    ::= { dot1dStp 1 }

dot1dStpPriority OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
        "The value of the write-able portion of the Bridge ID
        (i.e., the first two octets of the (8 octet long) Bridge
        ID).  The other (last) 6 octets of the Bridge ID are
        given by the value of dot1dBaseBridgeAddress.
        On bridges supporting IEEE 802.1t or IEEE 802.1w,
        permissible values are 0-61440, in steps of 4096."
    REFERENCE
        "IEEE 802.1D-1998 clause 8.10.2, Table 8-4,
        IEEE 802.1t clause 8.10.2, Table 8-4, clause 14.3."
    ::= { dot1dStp 2 }

dot1dStpTimeSinceTopologyChange OBJECT-TYPE
    SYNTAX      TimeTicks
    UNITS       "centi-seconds"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The time (in hundredths of a second) since the
        last time a topology change was detected by the
        bridge entity.
        For RSTP, this reports the time since the tcWhile
        timer for any port on this Bridge was nonzero."
    REFERENCE
        "IEEE 802.1D-1998 clause 14.8.1.1.,
        IEEE 802.1w clause 14.8.1.1."
    ::= { dot1dStp 3 }

dot1dStpTopChanges OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The total number of topology changes detected by
        this bridge since the management entity was last
        reset or initialized."
    REFERENCE
        "IEEE 802.1D-1998 clause 14.8.1.1."
    ::= { dot1dStp 4 }

dot1dStpDesignatedRoot OBJECT-TYPE
    SYNTAX      BridgeId
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The bridge identifier of the root of the spanning
        tree, as determined by the Spanning Tree Protocol,
        as executed by this node.  This value is used as
        the Root Identifier parameter in all Configuration
        Bridge PDUs originated by this node."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.3.1"
    ::= { dot1dStp 5 }

dot1dStpRootCost OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The cost of the path to the root as seen from
        this bridge."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.3.2"
    ::= { dot1dStp 6 }

dot1dStpRootPort OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The port number of the port that offers the lowest
        cost path from this bridge to the root bridge."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.3.3"
    ::= { dot1dStp 7 }

dot1dStpMaxAge OBJECT-TYPE
    SYNTAX      Timeout
    UNITS       "centi-seconds"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The maximum age of Spanning Tree Protocol information
        learned from the network on any port before it is
        discarded, in units of hundredths of a second.  This is
        the actual value that this bridge is currently using."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.3.4"
    ::= { dot1dStp 8 }

dot1dStpHelloTime OBJECT-TYPE
    SYNTAX      Timeout
    UNITS       "centi-seconds"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The amount of time between the transmission of
        Configuration bridge PDUs by this node on any port when
        it is the root of the spanning tree, or trying to become
        so, in units of hundredths of a second.  This is the
        actual value that this bridge is currently using."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.3.5"
    ::= { dot1dStp 9 }

dot1dStpHoldTime OBJECT-TYPE
    SYNTAX      Integer32
    UNITS       "centi-seconds"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "This time value determines the interval length
        during which no more than two Configuration bridge
        PDUs shall be transmitted by this node, in units
        of hundredths of a second."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.3.14"
    ::= { dot1dStp 10 }

dot1dStpForwardDelay OBJECT-TYPE
    SYNTAX      Timeout
    UNITS       "centi-seconds"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "This time value, measured in units of hundredths of a
        second, controls how fast a port changes its spanning
        state when moving towards the Forwarding state.  The
        value determines how long the port stays in each of the
        Listening and Learning states, which precede the
        Forwarding state.  This value is also used when a
        topology change has been detected and is underway, to
        age all dynamic entries in the Forwarding Database.
        [Note that this value is the one that this bridge is
        currently using, in contrast to
        dot1dStpBridgeForwardDelay, which is the value that this
        bridge and all others would start using if/when this
        bridge were to become the root.]"
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.3.6"
    ::= { dot1dStp 11 }

dot1dStpBridgeMaxAge OBJECT-TYPE
    SYNTAX      Timeout (600..4000)
    UNITS       "centi-seconds"
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
        "The value that all bridges use for MaxAge when this
        bridge is acting as the root.  Note that 802.1D-1998
        specifies that the range for this parameter is related
        to the value of dot1dStpBridgeHelloTime.  The
        granularity of this timer is specified by 802.1D-1998 to
        be 1 second.  An agent may return a badValue error if a
        set is attempted to a value that is not a whole number
        of seconds."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.3.8"
    ::= { dot1dStp 12 }

dot1dStpBridgeHelloTime OBJECT-TYPE
    SYNTAX      Timeout (100..1000)
    UNITS       "centi-seconds"
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
        "The value that all bridges use for HelloTime when this
        bridge is acting as the root.  The granularity of this
        timer is specified by 802.1D-1998 to be 1 second.  An
        agent may return a badValue error if a set is attempted

to a value that is not a whole number of seconds."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.3.9"
    ::= { dot1dStp 13 }

dot1dStpBridgeForwardDelay OBJECT-TYPE
    SYNTAX      Timeout (400..3000)
    UNITS       "centi-seconds"
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
        "The value that all bridges use for ForwardDelay when
        this bridge is acting as the root.  Note that
        802.1D-1998 specifies that the range for this parameter
        is related to the value of dot1dStpBridgeMaxAge.  The
        granularity of this timer is specified by 802.1D-1998 to
        be 1 second.  An agent may return a badValue error if a
        set is attempted to a value that is not a whole number
        of seconds."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.3.10"
    ::= { dot1dStp 14 }

-- ---------------------------------------------------------- --
-- The Spanning Tree Port Table
-- ---------------------------------------------------------- --

dot1dStpPortTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF Dot1dStpPortEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A table that contains port-specific information
        for the Spanning Tree Protocol."
    ::= { dot1dStp 15 }

dot1dStpPortEntry OBJECT-TYPE
    SYNTAX      Dot1dStpPortEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A list of information maintained by every port about
        the Spanning Tree Protocol state for that port."
    INDEX   { dot1dStpPort }
    ::= { dot1dStpPortTable 1 }

Dot1dStpPortEntry ::=
    SEQUENCE {

dot1dStpPort
            Integer32,
        dot1dStpPortPriority
            Integer32,
        dot1dStpPortState
            INTEGER,
        dot1dStpPortEnable
            INTEGER,
        dot1dStpPortPathCost
            Integer32,
        dot1dStpPortDesignatedRoot
            BridgeId,
        dot1dStpPortDesignatedCost
            Integer32,
        dot1dStpPortDesignatedBridge
            BridgeId,
        dot1dStpPortDesignatedPort
            OCTET STRING,
        dot1dStpPortForwardTransitions
            Counter32,
        dot1dStpPortPathCost32
            Integer32
    }

dot1dStpPort OBJECT-TYPE
    SYNTAX      Integer32 (1..65535)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The port number of the port for which this entry
        contains Spanning Tree Protocol management information."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.8.2.1.2"
    ::= { dot1dStpPortEntry 1 }

dot1dStpPortPriority OBJECT-TYPE
    SYNTAX      Integer32 (0..255)
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
        "The value of the priority field that is contained in
        the first (in network byte order) octet of the (2 octet
        long) Port ID.  The other octet of the Port ID is given
        by the value of dot1dStpPort.
        On bridges supporting IEEE 802.1t or IEEE 802.1w,
        permissible values are 0-240, in steps of 16."
    REFERENCE
        "IEEE 802.1D-1998 clause 8.10.2, Table 8-4,
        IEEE 802.1t clause 8.10.2, Table 8-4, clause 14.3."
    ::= { dot1dStpPortEntry 2 }

dot1dStpPortState OBJECT-TYPE
    SYNTAX      INTEGER {
                    disabled(1),
                    blocking(2),
                    listening(3),
                    learning(4),
                    forwarding(5),
                    broken(6)
                }
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The port's current state, as defined by application of
        the Spanning Tree Protocol.  This state controls what
        action a port takes on reception of a frame.  If the
        bridge has detected a port that is malfunctioning, it
        will place that port into the broken(6) state.  For
        ports that are disabled (see dot1dStpPortEnable), this
        object will have a value of disabled(1)."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.5.2"
    ::= { dot1dStpPortEntry 3 }

dot1dStpPortEnable OBJECT-TYPE
    SYNTAX      INTEGER {
                    enabled(1),
                    disabled(2)
                }
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
        "The enabled/disabled status of the port."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.5.2"
    ::= { dot1dStpPortEntry 4 }

dot1dStpPortPathCost OBJECT-TYPE
    SYNTAX      Integer32 (1..65535)
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
        "The contribution of this port to the path cost of
        paths towards the spanning tree root which include
        this port.  802.1D-1998 recommends that the default
        value of this parameter be in inverse proportion to

the speed of the attached LAN.

New implementations should support dot1dStpPortPathCost32.
        If the port path costs exceeds the maximum value of this
        object then this object should report the maximum value,
        namely 65535.  Applications should try to read the
        dot1dStpPortPathCost32 object if this object reports
        the maximum value."
    REFERENCE "IEEE 802.1D-1998: clause 8.5.5.3"
        ::= { dot1dStpPortEntry 5 }

dot1dStpPortDesignatedRoot OBJECT-TYPE
    SYNTAX      BridgeId
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The unique Bridge Identifier of the Bridge
        recorded as the Root in the Configuration BPDUs
        transmitted by the Designated Bridge for the
        segment to which the port is attached."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.5.4"
    ::= { dot1dStpPortEntry 6 }

dot1dStpPortDesignatedCost OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The path cost of the Designated Port of the segment
        connected to this port.  This value is compared to the
        Root Path Cost field in received bridge PDUs."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.5.5"
    ::= { dot1dStpPortEntry 7 }

dot1dStpPortDesignatedBridge OBJECT-TYPE
    SYNTAX      BridgeId
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The Bridge Identifier of the bridge that this
        port considers to be the Designated Bridge for
        this port's segment."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.5.6"
    ::= { dot1dStpPortEntry 8 }

dot1dStpPortDesignatedPort OBJECT-TYPE
    SYNTAX      OCTET STRING (SIZE (2))
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The Port Identifier of the port on the Designated
        Bridge for this port's segment."
    REFERENCE
        "IEEE 802.1D-1998: clause 8.5.5.7"
    ::= { dot1dStpPortEntry 9 }

dot1dStpPortForwardTransitions OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of times this port has transitioned
        from the Learning state to the Forwarding state."
    ::= { dot1dStpPortEntry 10 }

dot1dStpPortPathCost32 OBJECT-TYPE
    SYNTAX      Integer32 (1..200000000)
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
        "The contribution of this port to the path cost of
        paths towards the spanning tree root which include
        this port.  802.1D-1998 recommends that the default
        value of this parameter be in inverse proportion to
        the speed of the attached LAN.

This object replaces dot1dStpPortPathCost to support
        IEEE 802.1t."
    REFERENCE
        "IEEE 802.1t clause 8.10.2, Table 8-5."
    ::= { dot1dStpPortEntry 11 }

-- ---------------------------------------------------------- --
-- the dot1dTp subtree
-- ---------------------------------------------------------- --
-- Implementation of the dot1dTp subtree is optional.  It is
-- implemented by those bridges that support the transparent
-- bridging mode.  A transparent or SRT bridge will implement
-- this subtree.
-- ---------------------------------------------------------- --

dot1dTpLearnedEntryDiscards OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The total number of Forwarding Database entries that
        have been or would have been learned, but have been
        discarded due to a lack of storage space in the
        Forwarding Database.  If this counter is increasing, it
        indicates that the Forwarding Database is regularly
        becoming full (a condition that has unpleasant
        performance effects on the subnetwork).  If this counter
        has a significant value but is not presently increasing,
        it indicates that the problem has been occurring but is
        not persistent."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.7.1.1.3"
    ::= { dot1dTp 1 }

dot1dTpAgingTime OBJECT-TYPE
    SYNTAX      Integer32 (10..1000000)
    UNITS       "seconds"
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
        "The timeout period in seconds for aging out
        dynamically-learned forwarding information.
        802.1D-1998 recommends a default of 300 seconds."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.7.1.1.3"
    ::= { dot1dTp 2 }

-- ---------------------------------------------------------- --
--  The Forwarding Database for Transparent Bridges
-- ---------------------------------------------------------- --

dot1dTpFdbTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF Dot1dTpFdbEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A table that contains information about unicast
        entries for which the bridge has forwarding and/or
        filtering information.  This information is used
        by the transparent bridging function in
        determining how to propagate a received frame."
    ::= { dot1dTp 3 }

dot1dTpFdbEntry OBJECT-TYPE
    SYNTAX      Dot1dTpFdbEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "Information about a specific unicast MAC address
        for which the bridge has some forwarding and/or
        filtering information."
    INDEX   { dot1dTpFdbAddress }
    ::= { dot1dTpFdbTable 1 }

Dot1dTpFdbEntry ::=
    SEQUENCE {
        dot1dTpFdbAddress
            MacAddress,
        dot1dTpFdbPort
            Integer32,
        dot1dTpFdbStatus
            INTEGER
    }

dot1dTpFdbAddress OBJECT-TYPE
    SYNTAX      MacAddress
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "A unicast MAC address for which the bridge has
        forwarding and/or filtering information."
    REFERENCE
        "IEEE 802.1D-1998: clause 7.9.1, 7.9.2"
    ::= { dot1dTpFdbEntry 1 }

dot1dTpFdbPort OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "Either the value '0', or the port number of the port on
        which a frame having a source address equal to the value
        of the corresponding instance of dot1dTpFdbAddress has
        been seen.  A value of '0' indicates that the port
        number has not been learned, but that the bridge does
        have some forwarding/filtering information about this
        address (e.g., in the dot1dStaticTable).  Implementors
        are encouraged to assign the port value to this object
        whenever it is learned, even for addresses for which the
        corresponding value of dot1dTpFdbStatus is not
        learned(3)."
    ::= { dot1dTpFdbEntry 2 }

dot1dTpFdbStatus OBJECT-TYPE
    SYNTAX      INTEGER {
                    other(1),
                    invalid(2),
                    learned(3),
                    self(4),
                    mgmt(5)
                }
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The status of this entry.  The meanings of the
        values are:
            other(1) - none of the following.  This would
                include the case where some other MIB object
                (not the corresponding instance of
                dot1dTpFdbPort, nor an entry in the
                dot1dStaticTable) is being used to determine if
                and how frames addressed to the value of the
                corresponding instance of dot1dTpFdbAddress are
                being forwarded.
            invalid(2) - this entry is no longer valid (e.g.,
                it was learned but has since aged out), but has
                not yet been flushed from the table.
            learned(3) - the value of the corresponding instance
                of dot1dTpFdbPort was learned, and is being
                used.
            self(4) - the value of the corresponding instance of
                dot1dTpFdbAddress represents one of the bridge's
                addresses.  The corresponding instance of
                dot1dTpFdbPort indicates which of the bridge's
                ports has this address.
            mgmt(5) - the value of the corresponding instance of
                dot1dTpFdbAddress is also the value of an
                existing instance of dot1dStaticAddress."
    ::= { dot1dTpFdbEntry 3 }

-- ---------------------------------------------------------- --
--  Port Table for Transparent Bridges
-- ---------------------------------------------------------- --

dot1dTpPortTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF Dot1dTpPortEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A table that contains information about every port that
        is associated with this transparent bridge."
    ::= { dot1dTp 4 }

dot1dTpPortEntry OBJECT-TYPE
    SYNTAX      Dot1dTpPortEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A list of information for each port of a transparent
        bridge."
    INDEX   { dot1dTpPort }
    ::= { dot1dTpPortTable 1 }

Dot1dTpPortEntry ::=
    SEQUENCE {
        dot1dTpPort
            Integer32,
        dot1dTpPortMaxInfo
            Integer32,
        dot1dTpPortInFrames
            Counter32,
        dot1dTpPortOutFrames
            Counter32,
        dot1dTpPortInDiscards
            Counter32
    }

dot1dTpPort OBJECT-TYPE
    SYNTAX      Integer32 (1..65535)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The port number of the port for which this entry
        contains Transparent bridging management information."
    ::= { dot1dTpPortEntry 1 }

-- It would be nice if we could use ifMtu as the size of the
-- largest INFO field, but we can't because ifMtu is defined
-- to be the size that the (inter-)network layer can use, which
-- can differ from the MAC layer (especially if several layers
-- of encapsulation are used).

dot1dTpPortMaxInfo OBJECT-TYPE
    SYNTAX      Integer32
    UNITS       "bytes"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The maximum size of the INFO (non-MAC) field that

this port will receive or transmit."
    ::= { dot1dTpPortEntry 2 }

dot1dTpPortInFrames OBJECT-TYPE
    SYNTAX      Counter32
    UNITS       "frames"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of frames that have been received by this
        port from its segment.  Note that a frame received on the
        interface corresponding to this port is only counted by
        this object if and only if it is for a protocol being
        processed by the local bridging function, including
        bridge management frames."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.6.1.1.3"
    ::= { dot1dTpPortEntry 3 }

dot1dTpPortOutFrames OBJECT-TYPE
    SYNTAX      Counter32
    UNITS       "frames"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "The number of frames that have been transmitted by this
        port to its segment.  Note that a frame transmitted on
        the interface corresponding to this port is only counted
        by this object if and only if it is for a protocol being
        processed by the local bridging function, including
        bridge management frames."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.6.1.1.3"
    ::= { dot1dTpPortEntry 4 }

dot1dTpPortInDiscards OBJECT-TYPE
    SYNTAX      Counter32
    UNITS       "frames"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "Count of received valid frames that were discarded
        (i.e., filtered) by the Forwarding Process."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.6.1.1.3"
    ::= { dot1dTpPortEntry 5 }

-- ---------------------------------------------------------- --

-- The Static (Destination-Address Filtering) Database
-- ---------------------------------------------------------- --
-- Implementation of this subtree is optional.
-- ---------------------------------------------------------- --

dot1dStaticTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF Dot1dStaticEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A table containing filtering information configured
        into the bridge by (local or network) management
        specifying the set of ports to which frames received
        from specific ports and containing specific destination
        addresses are allowed to be forwarded.  The value of
        zero in this table, as the port number from which frames
        with a specific destination address are received, is
        used to specify all ports for which there is no specific
        entry in this table for that particular destination
        address.  Entries are valid for unicast and for
        group/broadcast addresses."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.7.2"
    ::= { dot1dStatic 1 }

dot1dStaticEntry OBJECT-TYPE
    SYNTAX      Dot1dStaticEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "Filtering information configured into the bridge by
        (local or network) management specifying the set of
        ports to which frames received from a specific port and
        containing a specific destination address are allowed to
        be forwarded."
    REFERENCE
        "IEEE 802.1D-1998: clause 14.7.2"
    INDEX   { dot1dStaticAddress, dot1dStaticReceivePort }
    ::= { dot1dStaticTable 1 }

Dot1dStaticEntry ::=
    SEQUENCE {
        dot1dStaticAddress       MacAddress,
        dot1dStaticReceivePort   Integer32,
        dot1dStaticAllowedToGoTo OCTET STRING,
        dot1dStaticStatus        INTEGER
    }

dot1dStaticAddress OBJECT-TYPE
    SYNTAX      MacAddress
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The destination MAC address in a frame to which this
        entry's filtering information applies.  This object can
        take the value of a unicast address, a group address, or
        the broadcast address."
    REFERENCE
        "IEEE 802.1D-1998: clause 7.9.1, 7.9.2"
    ::= { dot1dStaticEntry 1 }

dot1dStaticReceivePort OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "Either the value '0', or the port number of the port
        from which a frame must be received in order for this
        entry's filtering information to apply.  A value of zero
        indicates that this entry applies on all ports of the
        bridge for which there is no other applicable entry."
    ::= { dot1dStaticEntry 2 }

dot1dStaticAllowedToGoTo OBJECT-TYPE
    SYNTAX      OCTET STRING (SIZE (0..512))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The set of ports to which frames received from a
        specific port and destined for a specific MAC address,
        are allowed to be forwarded.  Each octet within the
        value of this object specifies a set of eight ports,
        with the first octet specifying ports 1 through 8, the
        second octet specifying ports 9 through 16, etc.  Within
        each octet, the most significant bit represents the
        lowest numbered port, and the least significant bit
        represents the highest numbered port.  Thus, each port
        of the bridge is represented by a single bit within the
        value of this object.  If that bit has a value of '1',
        then that port is included in the set of ports; the port
        is not included if its bit has a value of '0'.  (Note
        that the setting of the bit corresponding to the port
        from which a frame is received is irrelevant.)  The
        default value of this object is a string of ones of
        appropriate length.

The value of this object may exceed the required minimum
        maximum message size of some SNMP transport (484 bytes,
        in the case of SNMP over UDP, see RFC 3417, section 3.2).
        SNMP engines on bridges supporting a large number of
        ports must support appropriate maximum message sizes."
    ::= { dot1dStaticEntry 3 }

dot1dStaticStatus OBJECT-TYPE
    SYNTAX      INTEGER {
                    other(1),
                    invalid(2),
                    permanent(3),
                    deleteOnReset(4),
                    deleteOnTimeout(5)
                }
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "This object indicates the status of this entry.
        The default value is permanent(3).
            other(1) - this entry is currently in use but the
                conditions under which it will remain so are
                different from each of the following values.
            invalid(2) - writing this value to the object
                removes the corresponding entry.
            permanent(3) - this entry is currently in use and
                will remain so after the next reset of the
                bridge.
            deleteOnReset(4) - this entry is currently in use
                and will remain so until the next reset of the
                bridge.
            deleteOnTimeout(5) - this entry is currently in use
                and will remain so until it is aged out."
    ::= { dot1dStaticEntry 4 }

-- ---------------------------------------------------------- --
-- Notifications for use by Bridges
-- ---------------------------------------------------------- --
-- Notifications for the Spanning Tree Protocol
-- ---------------------------------------------------------- --

newRoot NOTIFICATION-TYPE
    -- OBJECTS     { }
    STATUS      current
    DESCRIPTION
        "The newRoot trap indicates that the sending agent has
        become the new root of the Spanning Tree; the trap is
        sent by a bridge soon after its election as the new

root, e.g., upon expiration of the Topology Change Timer,
        immediately subsequent to its election.  Implementation
        of this trap is optional."
    ::= { dot1dNotifications 1 }

topologyChange NOTIFICATION-TYPE
    -- OBJECTS     { }
    STATUS      current
    DESCRIPTION
        "A topologyChange trap is sent by a bridge when any of
        its configured ports transitions from the Learning state
        to the Forwarding state, or from the Forwarding state to
        the Blocking state.  The trap is not sent if a newRoot
        trap is sent for the same transition.  Implementation of
        this trap is optional."
    ::= { dot1dNotifications 2 }

-- ---------------------------------------------------------- --
-- IEEE 802.1D MIB - Conformance Information
-- ---------------------------------------------------------- --

dot1dGroups         OBJECT IDENTIFIER ::= { dot1dConformance 1 }
dot1dCompliances    OBJECT IDENTIFIER ::= { dot1dConformance 2 }

-- ---------------------------------------------------------- --
-- units of conformance
-- ---------------------------------------------------------- --

-- ---------------------------------------------------------- --
-- the dot1dBase group
-- ---------------------------------------------------------- --

dot1dBaseBridgeGroup OBJECT-GROUP
    OBJECTS {
        dot1dBaseBridgeAddress,
        dot1dBaseNumPorts,
        dot1dBaseType
    }
    STATUS      current
    DESCRIPTION
        "Bridge level information for this device."
    ::= { dot1dGroups 1 }

dot1dBasePortGroup OBJECT-GROUP
    OBJECTS {
        dot1dBasePort,
        dot1dBasePortIfIndex,
        dot1dBasePortCircuit,
        dot1dBasePortDelayExceededDiscards,
        dot1dBasePortMtuExceededDiscards
    }
    STATUS      current
    DESCRIPTION
        "Information for each port on this device."
    ::= { dot1dGroups 2 }

-- ---------------------------------------------------------- --
-- the dot1dStp group
-- ---------------------------------------------------------- --

dot1dStpBridgeGroup OBJECT-GROUP
    OBJECTS {
        dot1dStpProtocolSpecification,
        dot1dStpPriority,
        dot1dStpTimeSinceTopologyChange,
        dot1dStpTopChanges,
        dot1dStpDesignatedRoot,
        dot1dStpRootCost,
        dot1dStpRootPort,
        dot1dStpMaxAge,
        dot1dStpHelloTime,
        dot1dStpHoldTime,
        dot1dStpForwardDelay,
        dot1dStpBridgeMaxAge,
        dot1dStpBridgeHelloTime,
        dot1dStpBridgeForwardDelay
    }
    STATUS      current
    DESCRIPTION
        "Bridge level Spanning Tree data for this device."
    ::= { dot1dGroups 3 }

dot1dStpPortGroup OBJECT-GROUP
    OBJECTS {
        dot1dStpPort,
        dot1dStpPortPriority,
        dot1dStpPortState,
        dot1dStpPortEnable,
        dot1dStpPortPathCost,
        dot1dStpPortDesignatedRoot,
        dot1dStpPortDesignatedCost,
        dot1dStpPortDesignatedBridge,
        dot1dStpPortDesignatedPort,
        dot1dStpPortForwardTransitions
    }
    STATUS      current
    DESCRIPTION
        "Spanning Tree data for each port on this device."
    ::= { dot1dGroups 4 }

dot1dStpPortGroup2 OBJECT-GROUP
    OBJECTS {
        dot1dStpPort,
        dot1dStpPortPriority,
        dot1dStpPortState,
        dot1dStpPortEnable,
        dot1dStpPortDesignatedRoot,
        dot1dStpPortDesignatedCost,
        dot1dStpPortDesignatedBridge,
        dot1dStpPortDesignatedPort,
        dot1dStpPortForwardTransitions,
        dot1dStpPortPathCost32
    }
    STATUS      current
    DESCRIPTION
        "Spanning Tree data for each port on this device."
    ::= { dot1dGroups 5 }

dot1dStpPortGroup3 OBJECT-GROUP
    OBJECTS {
        dot1dStpPortPathCost32
    }
    STATUS      current
    DESCRIPTION
        "Spanning Tree data for devices supporting 32-bit
         path costs."
    ::= { dot1dGroups 6 }

-- ---------------------------------------------------------- --
-- the dot1dTp group
-- ---------------------------------------------------------- --

dot1dTpBridgeGroup OBJECT-GROUP
    OBJECTS {
        dot1dTpLearnedEntryDiscards,
        dot1dTpAgingTime
    }
    STATUS      current
    DESCRIPTION
        "Bridge level Transparent Bridging data."
    ::= { dot1dGroups 7 }

dot1dTpFdbGroup OBJECT-GROUP
    OBJECTS {

dot1dTpFdbAddress,
        dot1dTpFdbPort,
        dot1dTpFdbStatus
    }
    STATUS      current
    DESCRIPTION
        "Filtering Database information for the Bridge."
    ::= { dot1dGroups 8 }

dot1dTpGroup OBJECT-GROUP
    OBJECTS {
        dot1dTpPort,
        dot1dTpPortMaxInfo,
        dot1dTpPortInFrames,
        dot1dTpPortOutFrames,
        dot1dTpPortInDiscards
    }
    STATUS      current
    DESCRIPTION
        "Dynamic Filtering Database information for each port of
        the Bridge."
    ::= { dot1dGroups 9 }

-- ---------------------------------------------------------- --
-- The Static (Destination-Address Filtering) Database
-- ---------------------------------------------------------- --

dot1dStaticGroup OBJECT-GROUP
    OBJECTS {
        dot1dStaticAddress,
        dot1dStaticReceivePort,
        dot1dStaticAllowedToGoTo,
        dot1dStaticStatus
    }
    STATUS      current
    DESCRIPTION
        "Static Filtering Database information for each port of
        the Bridge."
    ::= { dot1dGroups 10 }

-- ---------------------------------------------------------- --
-- The Trap Notification Group
-- ---------------------------------------------------------- --

dot1dNotificationGroup NOTIFICATION-GROUP
    NOTIFICATIONS {
        newRoot,
        topologyChange
    }
    STATUS      current
    DESCRIPTION
        "Group of objects describing notifications (traps)."
    ::= { dot1dGroups 11 }

-- ---------------------------------------------------------- --
-- compliance statements
-- ---------------------------------------------------------- --

bridgeCompliance1493 MODULE-COMPLIANCE
    STATUS      current
    DESCRIPTION
        "The compliance statement for device support of bridging
        services, as per RFC1493."

MODULE
        MANDATORY-GROUPS {
            dot1dBaseBridgeGroup,
            dot1dBasePortGroup
        }

GROUP   dot1dStpBridgeGroup
    DESCRIPTION
        "Implementation of this group is mandatory for bridges
        that support the Spanning Tree Protocol."

GROUP   dot1dStpPortGroup
    DESCRIPTION
        "Implementation of this group is mandatory for bridges
        that support the Spanning Tree Protocol."

GROUP   dot1dTpBridgeGroup
    DESCRIPTION
        "Implementation of this group is mandatory for bridges
        that support the transparent bridging mode.  A
        transparent or SRT bridge will implement this group."

GROUP   dot1dTpFdbGroup
    DESCRIPTION
        "Implementation of this group is mandatory for bridges
        that support the transparent bridging mode.  A
        transparent or SRT bridge will implement this group."

GROUP   dot1dTpGroup
    DESCRIPTION
        "Implementation of this group is mandatory for bridges

that support the transparent bridging mode.  A
        transparent or SRT bridge will implement this group."

GROUP   dot1dStaticGroup
    DESCRIPTION
        "Implementation of this group is optional."

GROUP dot1dNotificationGroup
    DESCRIPTION
        "Implementation of this group is optional."
    ::= { dot1dCompliances 1 }

bridgeCompliance4188 MODULE-COMPLIANCE
    STATUS      current
    DESCRIPTION
        "The compliance statement for device support of bridging
        services.  This supports 32-bit Path Cost values and the
        more restricted bridge and port priorities, as per IEEE
        802.1t.

Full support for the 802.1D management objects requires that
        the SNMPv2-MIB [RFC3418] objects sysDescr, and sysUpTime, as
        well as the IF-MIB [RFC2863] objects ifIndex, ifType,
        ifDescr, ifPhysAddress, and ifLastChange are implemented."

MODULE
        MANDATORY-GROUPS {
            dot1dBaseBridgeGroup,
            dot1dBasePortGroup
        }

GROUP   dot1dStpBridgeGroup
    DESCRIPTION
        "Implementation of this group is mandatory for
        bridges that support the Spanning Tree Protocol."

OBJECT dot1dStpPriority
    SYNTAX Integer32 (0|4096|8192|12288|16384|20480|24576
                     |28672|32768|36864|40960|45056|49152
                     |53248|57344|61440)
    DESCRIPTION
        "The possible values defined by IEEE 802.1t."

GROUP   dot1dStpPortGroup2
    DESCRIPTION
        "Implementation of this group is mandatory for
        bridges that support the Spanning Tree Protocol."

GROUP   dot1dStpPortGroup3
    DESCRIPTION
        "Implementation of this group is mandatory for bridges
         that support the Spanning Tree Protocol and 32-bit path
         costs.  In particular, this includes devices supporting
         IEEE 802.1t and IEEE 802.1w."

OBJECT dot1dStpPortPriority
    SYNTAX Integer32 (0|16|32|48|64|80|96|112|128
                     |144|160|176|192|208|224|240)
    DESCRIPTION
        "The possible values defined by IEEE 802.1t."

GROUP   dot1dTpBridgeGroup
    DESCRIPTION
        "Implementation of this group is mandatory for
        bridges that support the transparent bridging
        mode.  A transparent or SRT bridge will implement
        this group."

GROUP   dot1dTpFdbGroup
    DESCRIPTION
        "Implementation of this group is mandatory for
        bridges that support the transparent bridging
        mode.  A transparent or SRT bridge will implement
        this group."

GROUP   dot1dTpGroup
    DESCRIPTION
        "Implementation of this group is mandatory for
        bridges that support the transparent bridging
        mode.  A transparent or SRT bridge will implement
        this group."

GROUP   dot1dStaticGroup
    DESCRIPTION
        "Implementation of this group is optional."

GROUP dot1dNotificationGroup
    DESCRIPTION
        "Implementation of this group is optional."
    ::= { dot1dCompliances 2 }

END

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