BRIDGE-MIB DEFINITIONS ::= BEGIN

IMPORTS
           Counter, TimeTicks
                   FROM RFC1155-SMI
           mib-2
                   FROM RFC1213-MIB
           OBJECT-TYPE
                   FROM RFC-1212
--           TRAP-TYPE
--                   FROM RFC-1215
           TruthValue
                   FROM SNMPv2-TC;

-- 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
-- defined by IEEE 802.1a, i.e., as if it were transmitted
-- least significant bit first, even though 802.5 (in
-- contrast to other n802.x protocols) 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 0's, i.e., AAFF would be
-- represented as 00000000AAFF.


-- Similarly, all representations of Bridge-Id in this MIB
-- Module use, as a textual convention (i.e. this
-- convention does not affect their encoding), the data
-- type:

BridgeId ::= OCTET STRING (SIZE (8))   -- 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).
-- 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 hundreths 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-1990 specifies a settable granularity of
-- no more than 1 second for these timers.  To avoid
-- ambiguity, a data type is defined here as a textual
-- convention and all representation of these timers
-- in this MIB module are defined using this data type.  An
-- algorithm is also defined for converting between the
-- different units, to ensure a timer's value is not
-- distorted by multiple conversions.
-- The data type is:

Timeout ::= INTEGER -- a STP timer in units of 1/100 seconds

-- 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 non-zero]
--      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).


   dot1dBridge   OBJECT IDENTIFIER ::= { mib-2 17 }

-- groups in the Bridge MIB

dot1dBase     OBJECT IDENTIFIER ::= { dot1dBridge 1 }

dot1dStp      OBJECT IDENTIFIER ::= { dot1dBridge 2 }

dot1dSr       OBJECT IDENTIFIER ::= { dot1dBridge 3 }
-- separately documented

dot1dTp       OBJECT IDENTIFIER ::= { dot1dBridge 4 }

dot1dStatic   OBJECT IDENTIFIER ::= { dot1dBridge 5 }


-- the dot1dBase group

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

dot1dBaseBridgeAddress OBJECT-TYPE
    SYNTAX  MacAddress
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Sections 6.4.1.1.3 and 3.12.5"
    ::= { dot1dBase 1 }

dot1dBaseNumPorts OBJECT-TYPE
    SYNTAX  INTEGER
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "The number of ports controlled by this bridging
            entity."
    REFERENCE
            "IEEE 802.1D-1990: Section 6.4.1.1.3"
    ::= { dot1dBase 2 }

dot1dBaseType OBJECT-TYPE
    SYNTAX  INTEGER {
                unknown(1),
                transparent-only(2),
                sourceroute-only(3),
                srt(4)
            }
    ACCESS  read-only
    STATUS  mandatory
    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
    ACCESS  not-accessible
    STATUS  mandatory
    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
    ACCESS  not-accessible
    STATUS  mandatory
    DESCRIPTION
            "A list of information for each port of the
            bridge."
    REFERENCE
            "IEEE 802.1D-1990: Section 6.4.2, 6.6.1"
    INDEX  { dot1dBasePort }
    ::= { dot1dBasePortTable 1 }


Dot1dBasePortEntry ::=
    SEQUENCE {
        dot1dBasePort
            INTEGER,
        dot1dBasePortIfIndex
            INTEGER,
        dot1dBasePortCircuit
            OBJECT IDENTIFIER,
        dot1dBasePortDelayExceededDiscards
            Counter,
        dot1dBasePortMtuExceededDiscards
            Counter
    }

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

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

dot1dBasePortCircuit OBJECT-TYPE
    SYNTAX  OBJECT IDENTIFIER
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "For a port which (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  Counter
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 6.6.1.1.3"
    ::= { dot1dBasePortEntry 4 }

dot1dBasePortMtuExceededDiscards OBJECT-TYPE
    SYNTAX  Counter
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 6.6.1.1.3"
    ::= { dot1dBasePortEntry 5 }


-- the dot1dStp group

-- Implementation of the dot1dStp group 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)
            }
    ACCESS  read-only
    STATUS  mandatory
    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
            are released that are incompatible with the
            current version a new value will be defined."
    ::= { dot1dStp 1 }

dot1dStpPriority OBJECT-TYPE
    SYNTAX  INTEGER (0..65535)
    ACCESS  read-write
    STATUS  mandatory
    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."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.3.7"
    ::= { dot1dStp 2 }

dot1dStpTimeSinceTopologyChange OBJECT-TYPE
    SYNTAX  TimeTicks
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "The time (in hundredths of a second) since the
            last time a topology change was detected by the
            bridge entity."
    REFERENCE
            "IEEE 802.1D-1990: Section 6.8.1.1.3"
    ::= { dot1dStp 3 }

dot1dStpTopChanges OBJECT-TYPE
    SYNTAX  Counter
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "The total number of topology changes detected by
            this bridge since the management entity was last
            reset or initialized."
    REFERENCE
            "IEEE 802.1D-1990: Section 6.8.1.1.3"
    ::= { dot1dStp 4 }

dot1dStpDesignatedRoot OBJECT-TYPE
    SYNTAX  BridgeId
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 4.5.3.1"
    ::= { dot1dStp 5 }

dot1dStpRootCost OBJECT-TYPE
    SYNTAX  INTEGER
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "The cost of the path to the root as seen from
            this bridge."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.3.2"
    ::= { dot1dStp 6 }

dot1dStpRootPort OBJECT-TYPE
    SYNTAX  INTEGER
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "The port number of the port which offers the
            lowest cost path from this bridge to the root
            bridge."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.3.3"
    ::= { dot1dStp 7 }

dot1dStpMaxAge OBJECT-TYPE
    SYNTAX  Timeout
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 4.5.3.4"
    ::= { dot1dStp 8 }

dot1dStpHelloTime OBJECT-TYPE
    SYNTAX  Timeout
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 4.5.3.5"
    ::= { dot1dStp 9 }

dot1dStpHoldTime OBJECT-TYPE
    SYNTAX  INTEGER
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 4.5.3.14"
    ::= { dot1dStp 10 }

dot1dStpForwardDelay OBJECT-TYPE
    SYNTAX  Timeout
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 4.5.3.6"
    ::= { dot1dStp 11 }

dot1dStpBridgeMaxAge OBJECT-TYPE
    SYNTAX  Timeout (600..4000)
    ACCESS  read-write
    STATUS  mandatory
    DESCRIPTION
            "The value that all bridges use for MaxAge when
            this bridge is acting as the root.  Note that
            802.1D-1990 specifies that the range for this
            parameter is related to the value of
            dot1dStpBridgeHelloTime. The granularity of this
            timer is specified by 802.1D-1990 to be 1 second.
            An agent may return a badValue error if a set is
            attempted to a value which is not a whole number
            of seconds."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.3.8"
    ::= { dot1dStp 12 }

dot1dStpBridgeHelloTime OBJECT-TYPE
    SYNTAX  Timeout (100..1000)
    ACCESS  read-write
    STATUS  mandatory
    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-
            1990 to be 1 second.  An agent may return a
            badValue error if a set is attempted to a value
            which is not a whole number of seconds."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.3.9"
    ::= { dot1dStp 13 }

dot1dStpBridgeForwardDelay OBJECT-TYPE
    SYNTAX  Timeout (400..3000)
    ACCESS  read-write
    STATUS  mandatory
    DESCRIPTION
            "The value that all bridges use for ForwardDelay
            when this bridge is acting as the root.  Note that
            802.1D-1990 specifies that the range for this
            parameter is related to the value of
            dot1dStpBridgeMaxAge.  The granularity of this
            timer is specified by 802.1D-1990 to be 1 second.
            An agent may return a badValue error if a set is
            attempted to a value which is not a whole number
            of seconds."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.3.10"
    ::= { dot1dStp 14 }

-- The Spanning Tree Port Table

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

dot1dStpPortEntry OBJECT-TYPE
    SYNTAX  Dot1dStpPortEntry
    ACCESS  not-accessible
    STATUS  mandatory
    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
            INTEGER,
        dot1dStpPortPriority
            INTEGER,
        dot1dStpPortState
            INTEGER,
        dot1dStpPortEnable
            INTEGER,
        dot1dStpPortPathCost
            INTEGER,
        dot1dStpPortDesignatedRoot
            BridgeId,
        dot1dStpPortDesignatedCost
            INTEGER,
        dot1dStpPortDesignatedBridge
            BridgeId,
        dot1dStpPortDesignatedPort
            OCTET STRING,
        dot1dStpPortForwardTransitions
            Counter
    }

dot1dStpPort OBJECT-TYPE
    SYNTAX  INTEGER (1..65535)
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "The port number of the port for which this entry
            contains Spanning Tree Protocol management
            information."
    REFERENCE
            "IEEE 802.1D-1990: Section 6.8.2.1.2"
    ::= { dot1dStpPortEntry 1 }

dot1dStpPortPriority OBJECT-TYPE
    SYNTAX  INTEGER (0..255)
    ACCESS  read-write
    STATUS  mandatory
    DESCRIPTION
            "The value of the priority field which 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."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.5.1"
    ::= { dot1dStpPortEntry 2 }

dot1dStpPortState OBJECT-TYPE
    SYNTAX  INTEGER {
                disabled(1),
                blocking(2),
                listening(3),
                learning(4),
                forwarding(5),
                broken(6)
            }
    ACCESS  read-only
    STATUS  mandatory
    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 which
            are disabled (see dot1dStpPortEnable), this object
            will have a value of disabled(1)."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.5.2"
    ::= { dot1dStpPortEntry 3 }

dot1dStpPortEnable OBJECT-TYPE
    SYNTAX  INTEGER {
                enabled(1),
                disabled(2)
            }
    ACCESS  read-write
    STATUS  mandatory
    DESCRIPTION
            "The enabled/disabled status of the port."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.5.2"
    ::= { dot1dStpPortEntry 4 }

dot1dStpPortPathCost OBJECT-TYPE
    SYNTAX  INTEGER (1..200000000)
    ACCESS  read-write
    STATUS  mandatory
    DESCRIPTION
            "The contribution of this port to the path cost of
            paths towards the spanning tree root which include
            this port.  802.1D-1990 recommends that the
            default value of this parameter be in inverse
            proportion to the speed of the attached LAN."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.5.3"
    ::= { dot1dStpPortEntry 5 }

dot1dStpPortDesignatedRoot OBJECT-TYPE
    SYNTAX  BridgeId
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 4.5.5.4"
    ::= { dot1dStpPortEntry 6 }

dot1dStpPortDesignatedCost OBJECT-TYPE
    SYNTAX  INTEGER
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 4.5.5.5"
    ::= { dot1dStpPortEntry 7 }

dot1dStpPortDesignatedBridge OBJECT-TYPE
    SYNTAX  BridgeId
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "The Bridge Identifier of the bridge which this
            port considers to be the Designated Bridge for
            this port's segment."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.5.6"
    ::= { dot1dStpPortEntry 8 }

dot1dStpPortDesignatedPort OBJECT-TYPE
    SYNTAX  OCTET STRING (SIZE (2))
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "The Port Identifier of the port on the Designated
            Bridge for this port's segment."
    REFERENCE
            "IEEE 802.1D-1990: Section 4.5.5.7"
    ::= { dot1dStpPortEntry 9 }

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


-- the dot1dTp group

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


dot1dTpLearnedEntryDiscards OBJECT-TYPE
    SYNTAX  Counter
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "The total number of Forwarding Database entries,
            which have been or would have been learnt, but
            have been discarded due to a lack of space to
            store them in the Forwarding Database.  If this
            counter is increasing, it indicates that the
            Forwarding Database is regularly becoming full (a
            condition which 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-1990: Section 6.7.1.1.3"
    ::= { dot1dTp 1 }

dot1dTpAgingTime OBJECT-TYPE
    SYNTAX   INTEGER (10..1000000)
    ACCESS   read-write
    STATUS   mandatory
    DESCRIPTION
            "The timeout period in seconds for aging out
            dynamically learned forwarding information.
            802.1D-1990 recommends a default of 300 seconds."
    REFERENCE
            "IEEE 802.1D-1990: Section 6.7.1.1.3"
    ::= { dot1dTp 2 }


--  The Forwarding Database for Transparent Bridges

dot1dTpFdbTable OBJECT-TYPE
    SYNTAX  SEQUENCE OF Dot1dTpFdbEntry
    ACCESS  not-accessible
    STATUS  mandatory
    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
    ACCESS  not-accessible
    STATUS  mandatory
    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
            INTEGER,
        dot1dTpFdbStatus
            INTEGER
    }

dot1dTpFdbAddress OBJECT-TYPE
    SYNTAX  MacAddress
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "A unicast MAC address for which the bridge has
            forwarding and/or filtering information."
    REFERENCE
            "IEEE 802.1D-1990: Section 3.9.1, 3.9.2"
    ::= { dot1dTpFdbEntry 1 }

dot1dTpFdbPort OBJECT-TYPE
    SYNTAX  INTEGER
    ACCESS  read-only
    STATUS  mandatory
    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),
                mgmt-dynamic(100)
            }
    ACCESS  read-only
    STATUS  mandatory
    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 not 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.

             mgmt-dynamic(100) : the value of the corresponding 
                           instance of dot1dTpFdbPort was dynamic
                           learned by service and is being used."
    ::= { dot1dTpFdbEntry 3 }

--  Port Table for Transparent Bridges

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

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

Dot1dTpPortEntry ::=
    SEQUENCE {
        dot1dTpPort
            INTEGER,
        dot1dTpPortMaxInfo
            INTEGER,
        dot1dTpPortInFrames
            Counter,
        dot1dTpPortOutFrames
            Counter,
        dot1dTpPortInDiscards
            Counter
    }

dot1dTpPort OBJECT-TYPE
    SYNTAX  INTEGER (1..65535)
    ACCESS  read-only
    STATUS  mandatory
    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  INTEGER
    ACCESS  read-only
    STATUS  mandatory
    DESCRIPTION
            "The maximum size of the INFO (non-MAC) field that
            this port will receive or transmit."
    ::= { dot1dTpPortEntry 2 }

dot1dTpPortInFrames OBJECT-TYPE
    SYNTAX  Counter
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 6.6.1.1.3"
    ::= { dot1dTpPortEntry 3 }

dot1dTpPortOutFrames OBJECT-TYPE
    SYNTAX  Counter
    ACCESS  read-only
    STATUS  mandatory
    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-1990: Section 6.6.1.1.3"
    ::= { dot1dTpPortEntry 4 }

dot1dTpPortInDiscards OBJECT-TYPE
    SYNTAX   Counter
    ACCESS   read-only
    STATUS   mandatory
    DESCRIPTION
            "Count of valid frames received which were
            discarded (i.e., filtered) by the Forwarding
            Process."
    REFERENCE
            "IEEE 802.1D-1990: Section 6.6.1.1.3"
    ::= { dot1dTpPortEntry 5 }


-- The Static (Destination-Address Filtering) Database

-- Implementation of this group is optional.


dot1dStaticTable OBJECT-TYPE
    SYNTAX  SEQUENCE OF Dot1dStaticEntry
    ACCESS  not-accessible
    STATUS  mandatory
    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-1990: Section 6.7.2"
    ::= { dot1dStatic 1 }

dot1dStaticEntry OBJECT-TYPE
    SYNTAX  Dot1dStaticEntry
    ACCESS  not-accessible
    STATUS  mandatory
    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-1990: Section 6.7.2"
    INDEX   { dot1dStaticAddress, dot1dStaticReceivePort }
    ::= { dot1dStaticTable 1 }

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

dot1dStaticAddress OBJECT-TYPE
    SYNTAX  MacAddress
    ACCESS  read-write
    STATUS  mandatory
    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-1990: Section 3.9.1, 3.9.2"
    ::= { dot1dStaticEntry 1 }

dot1dStaticReceivePort OBJECT-TYPE
    SYNTAX  INTEGER
    ACCESS  read-write
    STATUS  mandatory
    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
    ACCESS  read-write
    STATUS  mandatory
    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."
    ::= { dot1dStaticEntry 3 }

dot1dStaticStatus OBJECT-TYPE
    SYNTAX  INTEGER {
                other(1),
                invalid(2),
                permanent(3),
                deleteOnReset(4),
                deleteOnTimeout(5)
            }
    ACCESS  read-write
    STATUS  mandatory
    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 }


-- Traps for use by Bridges

-- Traps for the Spanning Tree Protocol

newRoot TRAP-TYPE
    ENTERPRISE  dot1dBridge
    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."
    ::= 1

topologyChange TRAP-TYPE
    ENTERPRISE  dot1dBridge
    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."
    ::= 2

END
