RFC1381-MIB device MIB details by RFC

RFC1381-MIB file content

The SNMP protocol is used to for conveying information and commands between agents and managing entities. SNMP uses the User Datagram Protocol (UDP) as the transport protocol for passing data between managers and agents. The reasons for using UDP for SNMP are, firstly it has low overheads in comparison to TCP, which uses a 3-way hand shake for connection. Secondly, in congested networks, SNMP over TCP is a bad idea because TCP in order to maintain reliability will flood the network with retransmissions.

Management information (MIB) is represented as a collection of managed objects. These objects together form a virtual information base called MIB. An agent may implement many MIBs, but all agents must implement a particular MIB called MIB-II [16]. This standard defines variables for things such as interface statistics (interface speeds, MTU, octets sent, octets received, etc.) as well as various other things pertaining to the system itself (system location, system contact, etc.). The main goal of MIB-II is to provide general TCP/IP management information.

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-- WinAgents MIB Extraction Wizard
-- Extracted from rfc1381.txt 16.03.2005 20:20:16

RFC1381-MIB DEFINITIONS ::= BEGIN

IMPORTS
        Counter
                FROM RFC1155-SMI
        transmission
                FROM RFC1213-MIB
        OBJECT-TYPE
                FROM RFC-1212;


                --  LAPB MIB

lapb    OBJECT IDENTIFIER ::= { transmission 16 }

PositiveInteger ::= INTEGER (0..2147483647)

IfIndexType     ::= INTEGER (1..2147483647)
-- IfIndexType specifies an index object for a table
-- with entries that match entries in the MIB-II ifTable.
-- The value of the index for the table will match the
-- ifIndex entry for same interface in the ifTable.
-- The values of this object range from 1 to ifNumber
-- inclusive.


-- ###########################################################
--                      LAPB Admn Table
-- ###########################################################

-- Support of the lapbAdmnTable is mandatory for all
-- agents of systems that implement LAPB.

lapbAdmnTable   OBJECT-TYPE
        SYNTAX  SEQUENCE OF LapbAdmnEntry
        ACCESS  not-accessible
        STATUS  mandatory

        DESCRIPTION
                "This table contains objects that can be
                changed to manage a LAPB interface.
                Changing one of these parameters may take
                effect in the operating LAPB immediately or
                may wait until the interface is restarted
                depending on the details of the
                implementation.

                Most of the objects in this read-write table
                have corresponding read-only objects in the
                lapbOperTable that return the current
                operating value.

                The operating values may be different from
                these configured values if changed by XID
                negotiation or if a configured parameter was
                changed after the interface was started."
        ::= { lapb 1 }

lapbAdmnEntry   OBJECT-TYPE
        SYNTAX  LapbAdmnEntry
        ACCESS  not-accessible
        STATUS  mandatory
        DESCRIPTION
                "Configured parameter values for a specific
                LAPB."
        INDEX { lapbAdmnIndex }
        ::= { lapbAdmnTable 1 }

LapbAdmnEntry ::= SEQUENCE {
        lapbAdmnIndex
                IfIndexType,
        lapbAdmnStationType
                INTEGER,
        lapbAdmnControlField
                INTEGER,
        lapbAdmnTransmitN1FrameSize
                PositiveInteger,
        lapbAdmnReceiveN1FrameSize
                PositiveInteger,
        lapbAdmnTransmitKWindowSize
                INTEGER,
        lapbAdmnReceiveKWindowSize
                INTEGER,
        lapbAdmnN2RxmitCount
        INTEGER,
        lapbAdmnT1AckTimer

                PositiveInteger,
        lapbAdmnT2AckDelayTimer
                PositiveInteger,
        lapbAdmnT3DisconnectTimer
                PositiveInteger,
        lapbAdmnT4IdleTimer
                PositiveInteger,
        lapbAdmnActionInitiate
                INTEGER,
        lapbAdmnActionRecvDM
                INTEGER
        }

lapbAdmnIndex   OBJECT-TYPE
        SYNTAX  IfIndexType
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The ifIndex value for the LAPB interface."
        ::= { lapbAdmnEntry 1 }

lapbAdmnStationType     OBJECT-TYPE
        SYNTAX  INTEGER {
                dte (1),
                dce (2),
                dxe (3)
                }
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "Identifies the desired station type of this
                interface."
        REFERENCE "ISO 7776 section 3.1"
        DEFVAL { dte }
        ::= { lapbAdmnEntry 2 }

lapbAdmnControlField OBJECT-TYPE
        SYNTAX  INTEGER {
                modulo8 (1),
                modulo128 (2)
                }
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The desired size of the sequence numbers
                used to number frames."
        REFERENCE "ISO 8885 Table 3, Name: HDLC Option - 10"
        DEFVAL { modulo8 }

        ::= { lapbAdmnEntry 3 }

lapbAdmnTransmitN1FrameSize OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The default maximum N1 frame size desired
                in number of bits for a frame transmitted by
                this DTE.  This excludes flags and 0 bits
                inserted for transparency."
        REFERENCE "ISO 8885 Table 3,
                Name: Information Field length"
        DEFVAL { 36000 } -- 4500 * 8; 802.5 Frame size

        ::= { lapbAdmnEntry 4 }

lapbAdmnReceiveN1FrameSize OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The default maximum N1 frame size desired
                in number of bits for a frame the DCE/remote
                DTE transmits to this DTE.  This excludes
                flags and 0 bits inserted for transparency."
        DEFVAL { 36000  } -- 4500 * 8; 802.5 Frame size

        ::= { lapbAdmnEntry 5 }

lapbAdmnTransmitKWindowSize OBJECT-TYPE
        SYNTAX  INTEGER (1..127)
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The default transmit window size for this
                Interface.  This is the maximum number of
                unacknowledged sequenced PDUs that may be
                outstanding from this DTE at any one time."
        REFERENCE "ISO 8885 Table 3, Name: Window size"
        DEFVAL { 7 }
        ::= { lapbAdmnEntry 6 }

lapbAdmnReceiveKWindowSize OBJECT-TYPE
        SYNTAX  INTEGER (1..127)
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The default receive window size for this
                Interface.  This is the maximum number of

                unacknowledged sequenced PDUs that may be
                outstanding from the DCE/remote DTE at any
                one time."
        REFERENCE "ISO 8885 Table 3, Name: Window size"
        DEFVAL { 7 }
        ::= { lapbAdmnEntry 7 }

lapbAdmnN2RxmitCount    OBJECT-TYPE
        SYNTAX  INTEGER (0..65535)
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The default N2 retry counter for this
                interface.  This specifies the number of
                times a PDU will be resent after the T1
                timer expires without an acknowledgement for
                the PDU."
        REFERENCE "ISO 8885 Table 3,
                Name: Retransmission Attempts"
        DEFVAL { 20 }
        ::= { lapbAdmnEntry 8 }

lapbAdmnT1AckTimer      OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The default T1 timer for this interface.
                This specifies the maximum time in
                Milliseconds to wait for acknowledgment of a
                PDU."
        REFERENCE "ISO 8885 Table 3, Name:
                Acknowledgement timer"
        DEFVAL { 3000 }
        ::= { lapbAdmnEntry 9 }

lapbAdmnT2AckDelayTimer         OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The default T2 timer for this interface.
                This specifies the maximum time in
                Milliseconds to wait before sending an
                acknowledgment for a sequenced PDU.  A value
                of zero means there will be no delay in
                acknowledgement generation."
        REFERENCE "ISO 8885 Table 3,

                Name: Reply delay timer"
        DEFVAL { 0 }
        ::= { lapbAdmnEntry 10 }

lapbAdmnT3DisconnectTimer OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The T3 timer for this interface.  This
                specifies the time in Milliseconds to wait
                before considering the link disconnected.  A
                value of zero indicates the link will be
                considered disconnected upon completion of
                the frame exchange to disconnect the link."
        REFERENCE "ISO 7776 section 5.7.1.3"
        DEFVAL { 60000 }
        ::= { lapbAdmnEntry 11 }

lapbAdmnT4IdleTimer OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The T4 timer for this interface.  This
                specifies the maximum time in Milliseconds
                to allow without frames being exchanged on
                the data link.  A value of 2147483647
                indicates no idle timer is being kept."
        REFERENCE "ISO 7776 section 5.7.1.4"
        DEFVAL { 2147483647 }
        ::= { lapbAdmnEntry 12 }

lapbAdmnActionInitiate OBJECT-TYPE
        SYNTAX  INTEGER {
        sendSABM (1),
                sendDISC (2),
                sendDM (3),
                none (4),
                other (5)
                }
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "This identifies the action LAPB will take
                to initiate link set-up."
        DEFVAL { sendSABM }
        ::= { lapbAdmnEntry 13 }

lapbAdmnActionRecvDM OBJECT-TYPE
        SYNTAX  INTEGER {
                sendSABM (1),
                sendDISC (2),
                other (3)
                }
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "This identifies the action LAPB will take
                when it receives a DM response."
        DEFVAL { sendSABM }
        ::= { lapbAdmnEntry 14 }


-- ###########################################################
--                      LAPB operating parameters.
-- ###########################################################

-- Support of the lapbOperTable is mandatory for all
-- agents of systems that implement LAPB.

lapbOperTable   OBJECT-TYPE
        SYNTAX  SEQUENCE OF LapbOperEntry
        ACCESS  not-accessible
        STATUS  mandatory
        DESCRIPTION
                "This table contains configuration
                information about interface parameters
                currently set in the interface.  Many of
                these objects have corresponding objects in
        the lapbAdmnTable."
        ::= { lapb 2 }

lapbOperEntry   OBJECT-TYPE
        SYNTAX  LapbOperEntry
        ACCESS  not-accessible
        STATUS  mandatory
        DESCRIPTION
                "Currently set parameter values for a
                specific LAPB."
        INDEX { lapbOperIndex }
        ::= { lapbOperTable 1 }

LapbOperEntry ::= SEQUENCE {
        lapbOperIndex
                IfIndexType,
        lapbOperStationType

                INTEGER,
        lapbOperControlField
                INTEGER,
        lapbOperTransmitN1FrameSize
                PositiveInteger,
        lapbOperReceiveN1FrameSize
                PositiveInteger,
        lapbOperTransmitKWindowSize
                INTEGER,
        lapbOperReceiveKWindowSize
                INTEGER,
        lapbOperN2RxmitCount
                INTEGER,
        lapbOperT1AckTimer
                PositiveInteger,
        lapbOperT2AckDelayTimer
                PositiveInteger,
        lapbOperT3DisconnectTimer
                PositiveInteger,
        lapbOperT4IdleTimer
                PositiveInteger,
        lapbOperPortId
                OBJECT IDENTIFIER,
        lapbOperProtocolVersionId
                OBJECT IDENTIFIER
        }

lapbOperIndex   OBJECT-TYPE
   SYNTAX       IfIndexType
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The ifIndex value for the LAPB interface."
        ::= { lapbOperEntry 1 }

lapbOperStationType     OBJECT-TYPE
        SYNTAX  INTEGER {
                dte (1),
                dce (2),
                dxe (3)
                }
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "Identifies the current operating station
                type of this interface.  A value of dxe (3)
                indicates XID negotiation has not yet taken
                place."

        REFERENCE "ISO 7776 section 3.1"
        ::= { lapbOperEntry 2 }

lapbOperControlField OBJECT-TYPE
        SYNTAX  INTEGER {
                modulo8 (1),
                modulo128 (2)
                }
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The current operating size of the sequence
                numbers used to number frames."
        REFERENCE "ISO 7776 section 3.3"
        ::= { lapbOperEntry 3 }

lapbOperTransmitN1FrameSize OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The current operating N1 frame size used
                for the maximum number of bits in a frame
                this DTE can transmit.  This excludes flags
                and 0 bits inserted for transparency."
        REFERENCE "ISO 7776 section 5.7.3"
        ::= { lapbOperEntry 4 }

lapbOperReceiveN1FrameSize OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-only
        STATUS  mandatory
        -- See lapbOperTransmitN1FrameSize above
        DESCRIPTION
                "The current operating N1 frame size used
                for the maximum number of bits in a frame
                the DCE/remote DTE can transmit.  This
                excludes flags and 0 bits inserted for
                transparency."
        ::= { lapbOperEntry 5 }

lapbOperTransmitKWindowSize OBJECT-TYPE
        SYNTAX  INTEGER (1..127)
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The current PDU window size this Interface
                uses to transmit.  This is the maximum

                number of unacknowledged sequenced PDUs that
                may be outstanding from this DTE at any one
                time."
        REFERENCE "ISO 7776 section 5.7.4"
        ::= { lapbOperEntry 6 }

lapbOperReceiveKWindowSize OBJECT-TYPE
        SYNTAX  INTEGER (1..127)
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The current receive PDU window size for
                this Interface.  This is the maximum number
                of unacknowledged sequenced PDUs that may be
                outstanding from the DCE/remote DTE at any
                one time."
        REFERENCE "ISO 7776 section 5.7.4"
        ::= { lapbOperEntry 7 }

lapbOperN2RxmitCount    OBJECT-TYPE
        SYNTAX  INTEGER (0..65535)
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The current N2 retry counter used for this
                interface.  This specifies the number of
                times a PDU will be resent after the T1
                timer expires without an acknowledgement for
                the PDU."
        REFERENCE "ISO 7776 section 5.7.2"
        ::= { lapbOperEntry 8 }

lapbOperT1AckTimer      OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The current T1 timer for this interface.
                This specifies the maximum time in
                Milliseconds to wait for acknowledgment of a
                PDU."
        REFERENCE "ISO 7776 section 5.7.1.1"
        ::= { lapbOperEntry 9 }

lapbOperT2AckDelayTimer         OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-only
        STATUS  mandatory

        DESCRIPTION
                "The current T2 timer for this interface.
                This specifies the maximum time in
                Milliseconds to wait before sending an
                acknowledgment for a sequenced PDU.  A value
                of zero means there will be no delay in
                acknowledgement generation."
        REFERENCE "ISO 7776 section 5.7.1.2"
        ::= { lapbOperEntry 10 }

lapbOperT3DisconnectTimer OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The current T3 timer for this interface.
                This specifies the time in Milliseconds to
                wait before considering the link
                disconnected.  A value of zero indicates the
                link will be considered disconnected upon
                completion of the frame exchange to
                disconnect the link."
        REFERENCE "ISO 7776 section 5.7.1.3"
        ::= { lapbOperEntry 11 }

lapbOperT4IdleTimer OBJECT-TYPE
        SYNTAX  PositiveInteger
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The current T4 timer for this interface.
                This specifies the maximum time in
                Milliseconds to allow without frames being
                exchanged on the data link.  A value of
                2147483647 indicates no idle timer is being
                kept."
        REFERENCE "ISO 7776 section 5.7.1.4"
        ::= { lapbOperEntry 12 }

lapbOperPortId OBJECT-TYPE
        SYNTAX  OBJECT IDENTIFIER
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "This object identifies an instance of the
                index object in the first group of objects
                in the MIB specific to the physical device
                or interface used to send and receive

                frames.  If an agent does not support any
                such objects, it should return nullSpec
                OBJECT IDENTIFIER {0 0}."
        ::= { lapbOperEntry 13 }

lapbOperProtocolVersionId       OBJECT-TYPE
        SYNTAX  OBJECT IDENTIFIER
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "This object identifies the version of the
                lapb protocol implemented by this
                interface."
        ::= { lapbOperEntry 14 }


-- ###########################################################
--                      LAPB    Flow Table
-- ###########################################################

-- Support of the lapbFlowTable is mandatory for all
-- agents of systems that implement LAPB.

lapbFlowTable OBJECT-TYPE
        SYNTAX  SEQUENCE OF LapbFlowEntry
        ACCESS  not-accessible
        STATUS  mandatory
        DESCRIPTION
                "This table defines the objects recorded by
                LAPB to provide information about the
                traffic flow through the interface."
        ::= { lapb 3 }

lapbFlowEntry OBJECT-TYPE
        SYNTAX  LapbFlowEntry
        ACCESS  not-accessible
        STATUS  mandatory
        DESCRIPTION
                "The information regarding the effects of
                flow controls in LAPB."
         INDEX { lapbFlowIfIndex }
        ::= { lapbFlowTable 1 }

LapbFlowEntry ::= SEQUENCE {
        lapbFlowIfIndex
                IfIndexType,
        lapbFlowStateChanges
                Counter,

        lapbFlowChangeReason
                INTEGER,
        lapbFlowCurrentMode
                INTEGER,
        lapbFlowBusyDefers
                Counter,
        lapbFlowRejOutPkts
                Counter,
        lapbFlowRejInPkts
                Counter,
        lapbFlowT1Timeouts
                Counter,
        lapbFlowFrmrSent
        OCTET STRING,
        lapbFlowFrmrReceived
                OCTET STRING,
        lapbFlowXidReceived
                OCTET STRING
        }

lapbFlowIfIndex OBJECT-TYPE
        SYNTAX  IfIndexType
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The ifIndex value for the LAPB Interface."
        ::= { lapbFlowEntry 1 }

lapbFlowStateChanges OBJECT-TYPE
        SYNTAX  Counter
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The number of LAPB State Changes, including
                resets."
        ::= { lapbFlowEntry 2 }

lapbFlowChangeReason OBJECT-TYPE
        SYNTAX  INTEGER {
                notStarted (1),    -- Initial state
                abmEntered (2),    -- SABM or UA
                abmeEntered (3),   -- SABME or UA
                abmReset (4),      -- SABM in ABM
                abmeReset (5),     -- SABME in ABME
                dmReceived (6),    -- DM Response
                dmSent (7),        -- DM sent
                discReceived (8),  -- DISC Response
                discSent (9),      -- DISC Sent

                frmrReceived (10), -- FRMR Received
                frmrSent (11),     -- FRMR Sent
                n2Timeout (12),    -- N2 Timer Expired
                other (13)
                  }
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The reason for the most recent incrementing
                of lapbFlowStateChanges.  A DM or DISC frame
                generated to initiate link set-up does not
                alter this object.  When the MIB-II object
                ifOperStatus does not have a value of
                testing, there exists a correlation between
                this object and ifOperStatus.  IfOperStatus
                will have a value of up when this object
                contains:  abmEntered, abmeEntered,
                abmReset, or abmeReset.  IfOperStatus will
                have a value of down when this object has a
                value of notStarted, or dmReceived through
                n2Timeout.  There is no correlation when
                this object has the value other."
        ::= { lapbFlowEntry 3 }

lapbFlowCurrentMode OBJECT-TYPE
        SYNTAX  INTEGER {
                disconnected (1),
                        -- initial state or DISC received

                linkSetup (2),
                        -- SABM sent

                frameReject (3),
                        -- Invalid frame received and
                        -- FRMR sent

                disconnectRequest (4),
                        -- DISC sent

                informationTransfer (5),
                        -- normal information transfer state
                        -- SABM(E) sent and UA received, or
                        -- SABM(E) received and UA sent

                rejFrameSent (6),
                        -- invalid NS received and REJ sent

                waitingAcknowledgement (7),

                        -- T1 expired and RR sent

                stationBusy (8),
                        -- RNR sent

                remoteStationBusy (9),
                        -- RNR received

                bothStationsBusy (10),
                        -- RNR received and RNR sent

                waitingAckStationBusy (11),
                        -- T1 expired, RNR sent

                waitingAckRemoteBusy (12),
                        -- T1 expired, RNR received

                waitingAckBothBusy (13),
                        -- T1 expired, RNR sent,
                        -- and RNR received

                rejFrameSentRemoteBusy (14),
                        -- REJ sent and RNR received

                xidFrameSent (15),
                        -- XID frame sent

                error (16),
                        -- An error state other than
                        -- a one defined above

                other (17)
                        --  A state not listed above
                  }
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The current condition of the conversation."
        ::= { lapbFlowEntry 4 }

lapbFlowBusyDefers OBJECT-TYPE
        SYNTAX  Counter
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The number of times this device was unable
                to transmit a frame due to a perceived
                remote busy condition.  Busy conditions can

                result from the receipt of an RNR from the
                remote device, the lack of valid sequence
                number space (window saturation), or other
                conditions."
        ::= { lapbFlowEntry 5 }

lapbFlowRejOutPkts OBJECT-TYPE
        SYNTAX  Counter
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The number of REJ or SREJ frames sent by
                this station."
        ::= { lapbFlowEntry 6 }

lapbFlowRejInPkts OBJECT-TYPE
        SYNTAX  Counter
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The number of REJ or SREJ frames received
                by this station."
        ::= { lapbFlowEntry 7 }

lapbFlowT1Timeouts OBJECT-TYPE
        SYNTAX  Counter
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The number of times a re-transmission was
                effected by the T1 Timer expiring."
        ::= { lapbFlowEntry 8 }

lapbFlowFrmrSent OBJECT-TYPE
        SYNTAX  OCTET STRING (SIZE (0..7))
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The Information Field of the FRMR most
                recently sent.  If no FRMR has been sent
                (the normal case) or the information isn't
                available, this will be an OCTET STRING of
                zero length."
        REFERENCE "ISO 7776 Section 4.3.9, tables 7 and 8"
        ::= { lapbFlowEntry 9 }

lapbFlowFrmrReceived OBJECT-TYPE
        SYNTAX  OCTET STRING (SIZE (0..7))

        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The Information Field of the FRMR most
                recently received.  If no FRMR has been
                received (the normal case) or the
                information isn't available, this will be an
                OCTET STRING of zero length."
        REFERENCE "ISO 7776 Section 4.3.9, tables 7 and 8"
        ::= { lapbFlowEntry 10 }

lapbFlowXidReceived OBJECT-TYPE
        SYNTAX  OCTET STRING (SIZE (0..8206))
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The Information Field of the XID frame most
                recently received.  If no XID frame has been
                received, this will be an OCTET STRING of
                zero length."
        REFERENCE "ISO 8885"
        ::= { lapbFlowEntry 11 }


-- ###########################################################
--                      LAPB    XID Table
-- ###########################################################

-- Support for the lapbXidTable is mandatory for all agents
-- of systems that have a LAPB implementation using XID
-- negotiation.  Agents of systems without XID negotiation
-- support should not implement this table.

lapbXidTable    OBJECT-TYPE
        SYNTAX  SEQUENCE OF LapbXidEntry
        ACCESS  not-accessible
        STATUS  mandatory
        DESCRIPTION
                "This table defines values to use for XID
                negotiation that are not found in the
                lapbAdmnTable.  This table is optional for
                implementations that don't support XID and
                mandatory for implementations that do
                initiate XID negotiation."
        ::= { lapb 4 }

lapbXidEntry    OBJECT-TYPE
        SYNTAX  LapbXidEntry

   ACCESS       not-accessible
        STATUS  mandatory
        DESCRIPTION
                "XId negotiation parameter values for a
                specific LAPB."
        INDEX { lapbXidIndex }
        ::= { lapbXidTable 1 }


LapbXidEntry ::= SEQUENCE {
        lapbXidIndex
                IfIndexType,
        lapbXidAdRIdentifier
                OCTET STRING,
        lapbXidAdRAddress
                OCTET STRING,
        lapbXidParameterUniqueIdentifier
                OCTET STRING,
        lapbXidGroupAddress
                OCTET STRING,
        lapbXidPortNumber
                OCTET STRING,
        lapbXidUserDataSubfield
                OCTET STRING
        }

lapbXidIndex    OBJECT-TYPE
        SYNTAX  IfIndexType
        ACCESS  read-only
        STATUS  mandatory
        DESCRIPTION
                "The ifIndex value for the LAPB interface."
        ::= { lapbXidEntry 1 }

lapbXidAdRIdentifier OBJECT-TYPE
        SYNTAX  OCTET STRING (SIZE (0..255))
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The value of the Address Resolution
                Identifier.  A zero length string indicates
                no Identifier value has been assigned."
        REFERENCE "ISO 8885 Table 2, Name: Identifier"
        DEFVAL { ''h }
        ::= { lapbXidEntry 2 }

lapbXidAdRAddress OBJECT-TYPE
        SYNTAX  OCTET STRING (SIZE (0..255))

        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The value of the Address Resolution
                Address.  A zero length string indicates no
                Address value has been assigned."
        REFERENCE "ISO 8885 Table 2, Name: Address"
        DEFVAL { ''h }
        ::= { lapbXidEntry 3 }

lapbXidParameterUniqueIdentifier OBJECT-TYPE
        SYNTAX  OCTET STRING (SIZE (0..255))
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The value of the parameter unique
                Identifier.  A zero length string indicates
                no Unique identifier value has been
                assigned."
        REFERENCE "ISO 8885 Table 3, Name: Identifier"
        DEFVAL { ''h }
        ::= { lapbXidEntry 4 }

lapbXidGroupAddress OBJECT-TYPE
        SYNTAX  OCTET STRING (SIZE (0..255))
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The value of the parameter Group address.
                A zero length string indicates no Group
                address value has been assigned."
        REFERENCE "ISO 8885 Table 3, Name: Group address"
        DEFVAL { ''h }
        ::= { lapbXidEntry 5 }

lapbXidPortNumber OBJECT-TYPE
        SYNTAX  OCTET STRING (SIZE (0..255))
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "The port number assigned for this link.  A
                zero length string indicates no local port
                number identifier has been assigned."
        REFERENCE "ISO 8885 Table 3, Name: Port number"
        DEFVAL { ''h }
        ::= { lapbXidEntry 6 }

lapbXidUserDataSubfield OBJECT-TYPE

        SYNTAX  OCTET STRING (SIZE (0..8206))
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
                "A user data subfield, if any, to be
                transmitted in an XID frame.  A zero length
                frame indicates no user data subfield has
                been assigned.  The octet string should
                include both the User data identifier and
                User data field as shown in Figures 1 and
                4."
        REFERENCE "ISO 8885 section 4.3"
        DEFVAL { ''h }
        ::= { lapbXidEntry 7 }


-- ###########################################################
--                      LAPB protocol versions
-- ###########################################################

lapbProtocolVersion OBJECT IDENTIFIER
        ::= { lapb 5 }

lapbProtocolIso7776v1986 OBJECT IDENTIFIER
        ::= { lapbProtocolVersion 1 }

lapbProtocolCcittV1980 OBJECT IDENTIFIER
        ::= { lapbProtocolVersion 2 }

lapbProtocolCcittV1984 OBJECT IDENTIFIER
        ::= { lapbProtocolVersion 3 }



-- The following describes some of the MIB-II interface
-- objects and their relationship with the objects in this
-- MIB extension.

-- ifDescr:  describes the interface.   It should include
-- identification information for the physical line and a
-- description of the network.  For connections to PDNs,
-- it should name the PDN.

-- ifMtu: the maximum number of octets an upper layer can
-- pass to this interface as a single frame.

-- ifSpeed:


-- ifAdminStatus:

-- ifOperStatus:

-- ifLastChange: the last time the state of the interface
-- changed.  A reset is considered an instantaneous change to
-- the ndm state and back to abm or abme.  This will be the
-- last time that lapbFlowChangeReason and lapbFlowChanges
-- changed.

-- ifInOctets: contains the number of octets
-- received from the peer LAPB including FCS.

-- ifInUcastPkts: contains the number of I-frames delivered
-- by this interface to a higher layer interface.

-- ifInDiscards: contains the number of received
-- frames discarded because of internal conditions
-- (such as lack of buffering).

-- ifInErrors: contains the number of Invalid frames received.
-- This does not have any relationship with the number REJ,
-- or RNR frames sent or received.

-- ifInUnknownProtos: contains the number of frames
-- that were correct but were dropped because they
-- were inappropriate for the current state.  This
-- includes an invalid Poll bit, an unknown address,
-- or other condition such as an RNR when connection
-- not established.  This also includes the number of
-- DISC or other frames that were ignored because the
-- link was not established and this interface was not
-- configured to perform link setup on that type frame.

-- ifOutOctets: number of octets sent to peer including
-- FCS octets.

-- ifOutUcastPkts: number of I-frames received from
-- a higher layer for transmission to peer.

-- ifOutDiscards: number of frames to be sent that were
-- dropped due to internal conditions such as buffering etc.

-- ifOutErrors: number of transmissions that failed
-- due to errors or were considered invalid by the receiver.
-- This does not have any relationship with the number REJ,
-- or RNR frames sent or received.


-- ifOutQLen: number of frames waiting to be transmitted.


-- This MIB does not provide any support for:
--      Multilink procedure (MLP) in ISO 7776 section 6
--      LLC Pbit timer
--      LLC REJ timer
--      LLC Busy State Timer 7.8.1.4

-- ###########################################################

END