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RFC 2863

 
 
 

The Interfaces Group MIB

Part 2 of 3, p. 26 to 49
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6.  Interfaces Group Definitions

IF-MIB DEFINITIONS ::= BEGIN

IMPORTS
    MODULE-IDENTITY, OBJECT-TYPE, Counter32, Gauge32, Counter64,
    Integer32, TimeTicks, mib-2,
    NOTIFICATION-TYPE                        FROM SNMPv2-SMI
    TEXTUAL-CONVENTION, DisplayString,
    PhysAddress, TruthValue, RowStatus,
    TimeStamp, AutonomousType, TestAndIncr   FROM SNMPv2-TC
    MODULE-COMPLIANCE, OBJECT-GROUP,
    NOTIFICATION-GROUP                       FROM SNMPv2-CONF
    snmpTraps                                FROM SNMPv2-MIB
    IANAifType                               FROM IANAifType-MIB;


ifMIB MODULE-IDENTITY
    LAST-UPDATED "200006140000Z"
    ORGANIZATION "IETF Interfaces MIB Working Group"
    CONTACT-INFO
            "   Keith McCloghrie
                Cisco Systems, Inc.
                170 West Tasman Drive
                San Jose, CA  95134-1706
                US

                408-526-5260
                kzm@cisco.com"
    DESCRIPTION
            "The MIB module to describe generic objects for network
            interface sub-layers.  This MIB is an updated version of
            MIB-II's ifTable, and incorporates the extensions defined in
            RFC 1229."

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    REVISION      "200006140000Z"
    DESCRIPTION
            "Clarifications agreed upon by the Interfaces MIB WG, and
            published as RFC 2863."
    REVISION      "199602282155Z"
    DESCRIPTION
            "Revisions made by the Interfaces MIB WG, and published in
            RFC 2233."
    REVISION      "199311082155Z"
    DESCRIPTION
            "Initial revision, published as part of RFC 1573."
    ::= { mib-2 31 }


ifMIBObjects OBJECT IDENTIFIER ::= { ifMIB 1 }

interfaces   OBJECT IDENTIFIER ::= { mib-2 2 }

--
-- Textual Conventions
--


-- OwnerString has the same semantics as used in RFC 1271

OwnerString ::= TEXTUAL-CONVENTION
    DISPLAY-HINT "255a"
    STATUS       deprecated
    DESCRIPTION
            "This data type is used to model an administratively
            assigned name of the owner of a resource.  This information
            is taken from the NVT ASCII character set.  It is suggested
            that this name contain one or more of the following: ASCII
            form of the manager station's transport address, management
            station name (e.g., domain name), network management
            personnel's name, location, or phone number.  In some cases
            the agent itself will be the owner of an entry.  In these
            cases, this string shall be set to a string starting with
            'agent'."
    SYNTAX       OCTET STRING (SIZE(0..255))

-- InterfaceIndex contains the semantics of ifIndex and should be used
-- for any objects defined in other MIB modules that need these semantics.

InterfaceIndex ::= TEXTUAL-CONVENTION
    DISPLAY-HINT "d"
    STATUS       current
    DESCRIPTION

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            "A unique value, greater than zero, for each interface or
            interface sub-layer in the managed system.  It is
            recommended that values are assigned contiguously starting
            from 1.  The value for each interface sub-layer must remain
            constant at least from one re-initialization of the entity's
            network management system to the next re-initialization."
    SYNTAX       Integer32 (1..2147483647)

InterfaceIndexOrZero ::= TEXTUAL-CONVENTION
    DISPLAY-HINT "d"
    STATUS       current
    DESCRIPTION
            "This textual convention is an extension of the
            InterfaceIndex convention.  The latter defines a greater
            than zero value used to identify an interface or interface
            sub-layer in the managed system.  This extension permits the
            additional value of zero.  the value zero is object-specific
            and must therefore be defined as part of the description of
            any object which uses this syntax.  Examples of the usage of
            zero might include situations where interface was unknown,
            or when none or all interfaces need to be referenced."
    SYNTAX       Integer32 (0..2147483647)

ifNumber  OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of network interfaces (regardless of their
            current state) present on this system."
    ::= { interfaces 1 }

ifTableLastChange  OBJECT-TYPE
    SYNTAX      TimeTicks
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The value of sysUpTime at the time of the last creation or
            deletion of an entry in the ifTable.  If the number of
            entries has been unchanged since the last re-initialization
            of the local network management subsystem, then this object
            contains a zero value."
    ::= { ifMIBObjects 5 }


-- the Interfaces table

-- The Interfaces table contains information on the entity's

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-- interfaces.  Each sub-layer below the internetwork-layer
-- of a network interface is considered to be an interface.

ifTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF IfEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "A list of interface entries.  The number of entries is
            given by the value of ifNumber."
    ::= { interfaces 2 }

ifEntry OBJECT-TYPE
    SYNTAX      IfEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "An entry containing management information applicable to a
            particular interface."
    INDEX   { ifIndex }
    ::= { ifTable 1 }

IfEntry ::=
    SEQUENCE {
        ifIndex                 InterfaceIndex,
        ifDescr                 DisplayString,
        ifType                  IANAifType,
        ifMtu                   Integer32,
        ifSpeed                 Gauge32,
        ifPhysAddress           PhysAddress,
        ifAdminStatus           INTEGER,
        ifOperStatus            INTEGER,
        ifLastChange            TimeTicks,
        ifInOctets              Counter32,
        ifInUcastPkts           Counter32,
        ifInNUcastPkts          Counter32,  -- deprecated
        ifInDiscards            Counter32,
        ifInErrors              Counter32,
        ifInUnknownProtos       Counter32,
        ifOutOctets             Counter32,
        ifOutUcastPkts          Counter32,
        ifOutNUcastPkts         Counter32,  -- deprecated
        ifOutDiscards           Counter32,
        ifOutErrors             Counter32,
        ifOutQLen               Gauge32,    -- deprecated
        ifSpecific              OBJECT IDENTIFIER -- deprecated
    }

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ifIndex OBJECT-TYPE
    SYNTAX      InterfaceIndex
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "A unique value, greater than zero, for each interface.  It
            is recommended that values are assigned contiguously
            starting from 1.  The value for each interface sub-layer
            must remain constant at least from one re-initialization of
            the entity's network management system to the next re-
            initialization."
    ::= { ifEntry 1 }

ifDescr OBJECT-TYPE
    SYNTAX      DisplayString (SIZE (0..255))
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "A textual string containing information about the
            interface.  This string should include the name of the
            manufacturer, the product name and the version of the
            interface hardware/software."
    ::= { ifEntry 2 }

ifType OBJECT-TYPE
    SYNTAX      IANAifType
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The type of interface.  Additional values for ifType are
            assigned by the Internet Assigned Numbers Authority (IANA),
            through updating the syntax of the IANAifType textual
            convention."
    ::= { ifEntry 3 }

ifMtu OBJECT-TYPE
    SYNTAX      Integer32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The size of the largest packet which can be sent/received
            on the interface, specified in octets.  For interfaces that
            are used for transmitting network datagrams, this is the
            size of the largest network datagram that can be sent on the
            interface."
    ::= { ifEntry 4 }

ifSpeed OBJECT-TYPE

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    SYNTAX      Gauge32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "An estimate of the interface's current bandwidth in bits
            per second.  For interfaces which do not vary in bandwidth
            or for those where no accurate estimation can be made, this
            object should contain the nominal bandwidth.  If the
            bandwidth of the interface is greater than the maximum value
            reportable by this object then this object should report its
            maximum value (4,294,967,295) and ifHighSpeed must be used
            to report the interace's speed.  For a sub-layer which has
            no concept of bandwidth, this object should be zero."
    ::= { ifEntry 5 }

ifPhysAddress OBJECT-TYPE
    SYNTAX      PhysAddress
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The interface's address at its protocol sub-layer.  For
            example, for an 802.x interface, this object normally
            contains a MAC address.  The interface's media-specific MIB
            must define the bit and byte ordering and the format of the
            value of this object.  For interfaces which do not have such
            an address (e.g., a serial line), this object should contain
            an octet string of zero length."
    ::= { ifEntry 6 }

ifAdminStatus OBJECT-TYPE
    SYNTAX  INTEGER {
                up(1),       -- ready to pass packets
                down(2),
                testing(3)   -- in some test mode
            }
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
            "The desired state of the interface.  The testing(3) state
            indicates that no operational packets can be passed.  When a
            managed system initializes, all interfaces start with
            ifAdminStatus in the down(2) state.  As a result of either
            explicit management action or per configuration information
            retained by the managed system, ifAdminStatus is then
            changed to either the up(1) or testing(3) states (or remains
            in the down(2) state)."
    ::= { ifEntry 7 }

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ifOperStatus OBJECT-TYPE
    SYNTAX  INTEGER {
                up(1),        -- ready to pass packets
                down(2),
                testing(3),   -- in some test mode
                unknown(4),   -- status can not be determined
                              -- for some reason.
                dormant(5),
                notPresent(6),    -- some component is missing
                lowerLayerDown(7) -- down due to state of
                                  -- lower-layer interface(s)
            }
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The current operational state of the interface.  The
            testing(3) state indicates that no operational packets can
            be passed.  If ifAdminStatus is down(2) then ifOperStatus
            should be down(2).  If ifAdminStatus is changed to up(1)
            then ifOperStatus should change to up(1) if the interface is
            ready to transmit and receive network traffic; it should
            change to dormant(5) if the interface is waiting for
            external actions (such as a serial line waiting for an
            incoming connection); it should remain in the down(2) state
            if and only if there is a fault that prevents it from going
            to the up(1) state; it should remain in the notPresent(6)
            state if the interface has missing (typically, hardware)
            components."
    ::= { ifEntry 8 }

ifLastChange OBJECT-TYPE
    SYNTAX      TimeTicks
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The value of sysUpTime at the time the interface entered
            its current operational state.  If the current state was
            entered prior to the last re-initialization of the local
            network management subsystem, then this object contains a
            zero value."
    ::= { ifEntry 9 }

ifInOctets OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The total number of octets received on the interface,

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            including framing characters.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifEntry 10 }

ifInUcastPkts OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of packets, delivered by this sub-layer to a
            higher (sub-)layer, which were not addressed to a multicast
            or broadcast address at this sub-layer.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifEntry 11 }

ifInNUcastPkts OBJECT-TYPE
    SYNTAX  Counter32
    MAX-ACCESS  read-only
    STATUS      deprecated
    DESCRIPTION
            "The number of packets, delivered by this sub-layer to a
            higher (sub-)layer, which were addressed to a multicast or
            broadcast address at this sub-layer.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime.

            This object is deprecated in favour of ifInMulticastPkts and
            ifInBroadcastPkts."
    ::= { ifEntry 12 }

ifInDiscards OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of inbound packets which were chosen to be
            discarded even though no errors had been detected to prevent

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            their being deliverable to a higher-layer protocol.  One
            possible reason for discarding such a packet could be to
            free up buffer space.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifEntry 13 }

ifInErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "For packet-oriented interfaces, the number of inbound
            packets that contained errors preventing them from being
            deliverable to a higher-layer protocol.  For character-
            oriented or fixed-length interfaces, the number of inbound
            transmission units that contained errors preventing them
            from being deliverable to a higher-layer protocol.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifEntry 14 }

ifInUnknownProtos OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "For packet-oriented interfaces, the number of packets
            received via the interface which were discarded because of
            an unknown or unsupported protocol.  For character-oriented
            or fixed-length interfaces that support protocol
            multiplexing the number of transmission units received via
            the interface which were discarded because of an unknown or
            unsupported protocol.  For any interface that does not
            support protocol multiplexing, this counter will always be
            0.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifEntry 15 }

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ifOutOctets OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The total number of octets transmitted out of the
            interface, including framing characters.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifEntry 16 }

ifOutUcastPkts OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The total number of packets that higher-level protocols
            requested be transmitted, and which were not addressed to a
            multicast or broadcast address at this sub-layer, including
            those that were discarded or not sent.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifEntry 17 }

ifOutNUcastPkts OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      deprecated
    DESCRIPTION
            "The total number of packets that higher-level protocols
            requested be transmitted, and which were addressed to a
            multicast or broadcast address at this sub-layer, including
            those that were discarded or not sent.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime.

            This object is deprecated in favour of ifOutMulticastPkts
            and ifOutBroadcastPkts."
    ::= { ifEntry 18 }

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ifOutDiscards OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of outbound packets which were chosen to be
            discarded even though no errors had been detected to prevent
            their being transmitted.  One possible reason for discarding
            such a packet could be to free up buffer space.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifEntry 19 }

ifOutErrors OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "For packet-oriented interfaces, the number of outbound
            packets that could not be transmitted because of errors.
            For character-oriented or fixed-length interfaces, the
            number of outbound transmission units that could not be
            transmitted because of errors.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifEntry 20 }

ifOutQLen OBJECT-TYPE
    SYNTAX      Gauge32
    MAX-ACCESS  read-only
    STATUS      deprecated
    DESCRIPTION
            "The length of the output packet queue (in packets)."
    ::= { ifEntry 21 }

ifSpecific OBJECT-TYPE
    SYNTAX      OBJECT IDENTIFIER
    MAX-ACCESS  read-only
    STATUS      deprecated
    DESCRIPTION
            "A reference to MIB definitions specific to the particular
            media being used to realize the interface.  It is

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            recommended that this value point to an instance of a MIB
            object in the media-specific MIB, i.e., that this object
            have the semantics associated with the InstancePointer
            textual convention defined in RFC 2579.  In fact, it is
            recommended that the media-specific MIB specify what value
            ifSpecific should/can take for values of ifType.  If no MIB
            definitions specific to the particular media are available,
            the value should be set to the OBJECT IDENTIFIER { 0 0 }."
    ::= { ifEntry 22 }



--
--   Extension to the interface table
--
-- This table replaces the ifExtnsTable table.
--

ifXTable        OBJECT-TYPE
    SYNTAX      SEQUENCE OF IfXEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "A list of interface entries.  The number of entries is
            given by the value of ifNumber.  This table contains
            additional objects for the interface table."
    ::= { ifMIBObjects 1 }

ifXEntry        OBJECT-TYPE
    SYNTAX      IfXEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "An entry containing additional management information
            applicable to a particular interface."
    AUGMENTS    { ifEntry }
    ::= { ifXTable 1 }

IfXEntry ::=
    SEQUENCE {
        ifName                  DisplayString,
        ifInMulticastPkts       Counter32,
        ifInBroadcastPkts       Counter32,
        ifOutMulticastPkts      Counter32,
        ifOutBroadcastPkts      Counter32,
        ifHCInOctets            Counter64,
        ifHCInUcastPkts         Counter64,
        ifHCInMulticastPkts     Counter64,

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        ifHCInBroadcastPkts     Counter64,
        ifHCOutOctets           Counter64,
        ifHCOutUcastPkts        Counter64,
        ifHCOutMulticastPkts    Counter64,
        ifHCOutBroadcastPkts    Counter64,
        ifLinkUpDownTrapEnable  INTEGER,
        ifHighSpeed             Gauge32,
        ifPromiscuousMode       TruthValue,
        ifConnectorPresent      TruthValue,
        ifAlias                 DisplayString,
        ifCounterDiscontinuityTime TimeStamp
    }


ifName OBJECT-TYPE
    SYNTAX      DisplayString
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The textual name of the interface.  The value of this
            object should be the name of the interface as assigned by
            the local device and should be suitable for use in commands
            entered at the device's `console'.  This might be a text
            name, such as `le0' or a simple port number, such as `1',
            depending on the interface naming syntax of the device.  If
            several entries in the ifTable together represent a single
            interface as named by the device, then each will have the
            same value of ifName.  Note that for an agent which responds
            to SNMP queries concerning an interface on some other
            (proxied) device, then the value of ifName for such an
            interface is the proxied device's local name for it.

            If there is no local name, or this object is otherwise not
            applicable, then this object contains a zero-length string."
    ::= { ifXEntry 1 }

ifInMulticastPkts OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of packets, delivered by this sub-layer to a
            higher (sub-)layer, which were addressed to a multicast
            address at this sub-layer.  For a MAC layer protocol, this
            includes both Group and Functional addresses.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other

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            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 2 }

ifInBroadcastPkts OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of packets, delivered by this sub-layer to a
            higher (sub-)layer, which were addressed to a broadcast
            address at this sub-layer.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 3 }

ifOutMulticastPkts OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The total number of packets that higher-level protocols
            requested be transmitted, and which were addressed to a
            multicast address at this sub-layer, including those that
            were discarded or not sent.  For a MAC layer protocol, this
            includes both Group and Functional addresses.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 4 }

ifOutBroadcastPkts OBJECT-TYPE
    SYNTAX      Counter32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The total number of packets that higher-level protocols
            requested be transmitted, and which were addressed to a
            broadcast address at this sub-layer, including those that
            were discarded or not sent.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other

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            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 5 }

--
-- High Capacity Counter objects.  These objects are all
-- 64 bit versions of the "basic" ifTable counters.  These
-- objects all have the same basic semantics as their 32-bit
-- counterparts, however, their syntax has been extended
-- to 64 bits.
--

ifHCInOctets OBJECT-TYPE
    SYNTAX      Counter64
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The total number of octets received on the interface,
            including framing characters.  This object is a 64-bit
            version of ifInOctets.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 6 }

ifHCInUcastPkts OBJECT-TYPE
    SYNTAX      Counter64
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of packets, delivered by this sub-layer to a
            higher (sub-)layer, which were not addressed to a multicast
            or broadcast address at this sub-layer.  This object is a
            64-bit version of ifInUcastPkts.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 7 }

ifHCInMulticastPkts OBJECT-TYPE
    SYNTAX      Counter64
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION

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            "The number of packets, delivered by this sub-layer to a
            higher (sub-)layer, which were addressed to a multicast
            address at this sub-layer.  For a MAC layer protocol, this
            includes both Group and Functional addresses.  This object
            is a 64-bit version of ifInMulticastPkts.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 8 }

ifHCInBroadcastPkts OBJECT-TYPE
    SYNTAX      Counter64
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The number of packets, delivered by this sub-layer to a
            higher (sub-)layer, which were addressed to a broadcast
            address at this sub-layer.  This object is a 64-bit version
            of ifInBroadcastPkts.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 9 }

ifHCOutOctets OBJECT-TYPE
    SYNTAX      Counter64
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The total number of octets transmitted out of the
            interface, including framing characters.  This object is a
            64-bit version of ifOutOctets.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 10 }

ifHCOutUcastPkts OBJECT-TYPE
    SYNTAX      Counter64
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION

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            "The total number of packets that higher-level protocols
            requested be transmitted, and which were not addressed to a
            multicast or broadcast address at this sub-layer, including
            those that were discarded or not sent.  This object is a
            64-bit version of ifOutUcastPkts.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 11 }

ifHCOutMulticastPkts OBJECT-TYPE
    SYNTAX      Counter64
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The total number of packets that higher-level protocols
            requested be transmitted, and which were addressed to a
            multicast address at this sub-layer, including those that
            were discarded or not sent.  For a MAC layer protocol, this
            includes both Group and Functional addresses.  This object
            is a 64-bit version of ifOutMulticastPkts.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 12 }

ifHCOutBroadcastPkts OBJECT-TYPE
    SYNTAX      Counter64
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The total number of packets that higher-level protocols
            requested be transmitted, and which were addressed to a
            broadcast address at this sub-layer, including those that
            were discarded or not sent.  This object is a 64-bit version
            of ifOutBroadcastPkts.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            ifCounterDiscontinuityTime."
    ::= { ifXEntry 13 }

ifLinkUpDownTrapEnable  OBJECT-TYPE

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    SYNTAX      INTEGER { enabled(1), disabled(2) }
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
            "Indicates whether linkUp/linkDown traps should be generated
            for this interface.

            By default, this object should have the value enabled(1) for
            interfaces which do not operate on 'top' of any other
            interface (as defined in the ifStackTable), and disabled(2)
            otherwise."
    ::= { ifXEntry 14 }

ifHighSpeed OBJECT-TYPE
    SYNTAX      Gauge32
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "An estimate of the interface's current bandwidth in units
            of 1,000,000 bits per second.  If this object reports a
            value of `n' then the speed of the interface is somewhere in
            the range of `n-500,000' to `n+499,999'.  For interfaces
            which do not vary in bandwidth or for those where no
            accurate estimation can be made, this object should contain
            the nominal bandwidth.  For a sub-layer which has no concept
            of bandwidth, this object should be zero."
    ::= { ifXEntry 15 }

ifPromiscuousMode  OBJECT-TYPE
    SYNTAX      TruthValue
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
            "This object has a value of false(2) if this interface only
            accepts packets/frames that are addressed to this station.
            This object has a value of true(1) when the station accepts
            all packets/frames transmitted on the media.  The value
            true(1) is only legal on certain types of media.  If legal,
            setting this object to a value of true(1) may require the
            interface to be reset before becoming effective.

            The value of ifPromiscuousMode does not affect the reception
            of broadcast and multicast packets/frames by the interface."
    ::= { ifXEntry 16 }

ifConnectorPresent   OBJECT-TYPE
    SYNTAX      TruthValue
    MAX-ACCESS  read-only

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    STATUS      current
    DESCRIPTION
            "This object has the value 'true(1)' if the interface
            sublayer has a physical connector and the value 'false(2)'
            otherwise."
    ::= { ifXEntry 17 }

ifAlias   OBJECT-TYPE
    SYNTAX      DisplayString (SIZE(0..64))
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
            "This object is an 'alias' name for the interface as
            specified by a network manager, and provides a non-volatile
            'handle' for the interface.

            On the first instantiation of an interface, the value of
            ifAlias associated with that interface is the zero-length
            string.  As and when a value is written into an instance of
            ifAlias through a network management set operation, then the
            agent must retain the supplied value in the ifAlias instance
            associated with the same interface for as long as that
            interface remains instantiated, including across all re-
            initializations/reboots of the network management system,
            including those which result in a change of the interface's
            ifIndex value.

            An example of the value which a network manager might store
            in this object for a WAN interface is the (Telco's) circuit
            number/identifier of the interface.

            Some agents may support write-access only for interfaces
            having particular values of ifType.  An agent which supports
            write access to this object is required to keep the value in
            non-volatile storage, but it may limit the length of new
            values depending on how much storage is already occupied by
            the current values for other interfaces."
    ::= { ifXEntry 18 }

ifCounterDiscontinuityTime OBJECT-TYPE
    SYNTAX      TimeStamp
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The value of sysUpTime on the most recent occasion at which
            any one or more of this interface's counters suffered a
            discontinuity.  The relevant counters are the specific
            instances associated with this interface of any Counter32 or

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            Counter64 object contained in the ifTable or ifXTable.  If
            no such discontinuities have occurred since the last re-
            initialization of the local management subsystem, then this
            object contains a zero value."
    ::= { ifXEntry 19 }

--           The Interface Stack Group
--
-- Implementation of this group is optional, but strongly recommended
-- for all systems
--

ifStackTable  OBJECT-TYPE
     SYNTAX        SEQUENCE OF IfStackEntry
     MAX-ACCESS    not-accessible
     STATUS        current
     DESCRIPTION
            "The table containing information on the relationships
            between the multiple sub-layers of network interfaces.  In
            particular, it contains information on which sub-layers run
            'on top of' which other sub-layers, where each sub-layer
            corresponds to a conceptual row in the ifTable.  For
            example, when the sub-layer with ifIndex value x runs over
            the sub-layer with ifIndex value y, then this table
            contains:

              ifStackStatus.x.y=active

            For each ifIndex value, I, which identifies an active
            interface, there are always at least two instantiated rows
            in this table associated with I.  For one of these rows, I
            is the value of ifStackHigherLayer; for the other, I is the
            value of ifStackLowerLayer.  (If I is not involved in
            multiplexing, then these are the only two rows associated
            with I.)

            For example, two rows exist even for an interface which has
            no others stacked on top or below it:

              ifStackStatus.0.x=active
              ifStackStatus.x.0=active "
     ::= { ifMIBObjects 2 }


ifStackEntry  OBJECT-TYPE
     SYNTAX        IfStackEntry
     MAX-ACCESS    not-accessible
     STATUS        current

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     DESCRIPTION
            "Information on a particular relationship between two sub-
            layers, specifying that one sub-layer runs on 'top' of the
            other sub-layer.  Each sub-layer corresponds to a conceptual
            row in the ifTable."
     INDEX { ifStackHigherLayer, ifStackLowerLayer }
     ::= { ifStackTable 1 }


IfStackEntry ::=
    SEQUENCE {
        ifStackHigherLayer  InterfaceIndexOrZero,
        ifStackLowerLayer   InterfaceIndexOrZero,
        ifStackStatus       RowStatus
     }


ifStackHigherLayer  OBJECT-TYPE
     SYNTAX        InterfaceIndexOrZero
     MAX-ACCESS    not-accessible
     STATUS        current
     DESCRIPTION
            "The value of ifIndex corresponding to the higher sub-layer
            of the relationship, i.e., the sub-layer which runs on 'top'
            of the sub-layer identified by the corresponding instance of
            ifStackLowerLayer.  If there is no higher sub-layer (below
            the internetwork layer), then this object has the value 0."
     ::= { ifStackEntry 1 }


ifStackLowerLayer  OBJECT-TYPE
     SYNTAX        InterfaceIndexOrZero
     MAX-ACCESS    not-accessible
     STATUS        current
     DESCRIPTION
            "The value of ifIndex corresponding to the lower sub-layer
            of the relationship, i.e., the sub-layer which runs 'below'
            the sub-layer identified by the corresponding instance of
            ifStackHigherLayer.  If there is no lower sub-layer, then
            this object has the value 0."
     ::= { ifStackEntry 2 }


ifStackStatus  OBJECT-TYPE
    SYNTAX         RowStatus
    MAX-ACCESS     read-create
    STATUS         current
    DESCRIPTION

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            "The status of the relationship between two sub-layers.

            Changing the value of this object from 'active' to
            'notInService' or 'destroy' will likely have consequences up
            and down the interface stack.  Thus, write access to this
            object is likely to be inappropriate for some types of
            interfaces, and many implementations will choose not to
            support write-access for any type of interface."
    ::= { ifStackEntry 3 }

ifStackLastChange OBJECT-TYPE
    SYNTAX         TimeTicks
    MAX-ACCESS     read-only
    STATUS         current
    DESCRIPTION
            "The value of sysUpTime at the time of the last change of
            the (whole) interface stack.  A change of the interface
            stack is defined to be any creation, deletion, or change in
            value of any instance of ifStackStatus.  If the interface
            stack has been unchanged since the last re-initialization of
            the local network management subsystem, then this object
            contains a zero value."
    ::= { ifMIBObjects 6 }


--   Generic Receive Address Table
--
-- This group of objects is mandatory for all types of
-- interfaces which can receive packets/frames addressed to
-- more than one address.
--
-- This table replaces the ifExtnsRcvAddr table.  The main
-- difference is that this table makes use of the RowStatus
-- textual convention, while ifExtnsRcvAddr did not.

ifRcvAddressTable  OBJECT-TYPE
    SYNTAX      SEQUENCE OF IfRcvAddressEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This table contains an entry for each address (broadcast,
            multicast, or uni-cast) for which the system will receive
            packets/frames on a particular interface, except as follows:

            - for an interface operating in promiscuous mode, entries
            are only required for those addresses for which the system
            would receive frames were it not operating in promiscuous
            mode.

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            - for 802.5 functional addresses, only one entry is
            required, for the address which has the functional address
            bit ANDed with the bit mask of all functional addresses for
            which the interface will accept frames.

            A system is normally able to use any unicast address which
            corresponds to an entry in this table as a source address."
    ::= { ifMIBObjects 4 }

ifRcvAddressEntry  OBJECT-TYPE
    SYNTAX      IfRcvAddressEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "A list of objects identifying an address for which the
            system will accept packets/frames on the particular
            interface identified by the index value ifIndex."
    INDEX  { ifIndex, ifRcvAddressAddress }
    ::= { ifRcvAddressTable 1 }

IfRcvAddressEntry ::=
    SEQUENCE {
        ifRcvAddressAddress   PhysAddress,
        ifRcvAddressStatus    RowStatus,
        ifRcvAddressType      INTEGER
    }

ifRcvAddressAddress OBJECT-TYPE
    SYNTAX      PhysAddress
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "An address for which the system will accept packets/frames
            on this entry's interface."
    ::= { ifRcvAddressEntry 1 }

ifRcvAddressStatus OBJECT-TYPE
    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object is used to create and delete rows in the
            ifRcvAddressTable."

    ::= { ifRcvAddressEntry 2 }

ifRcvAddressType OBJECT-TYPE
    SYNTAX      INTEGER {

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                    other(1),
                    volatile(2),
                    nonVolatile(3)
                }

    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object has the value nonVolatile(3) for those entries
            in the table which are valid and will not be deleted by the
            next restart of the managed system.  Entries having the
            value volatile(2) are valid and exist, but have not been
            saved, so that will not exist after the next restart of the
            managed system.  Entries having the value other(1) are valid
            and exist but are not classified as to whether they will
            continue to exist after the next restart."

    DEFVAL  { volatile }
    ::= { ifRcvAddressEntry 3 }

-- definition of interface-related traps.

linkDown NOTIFICATION-TYPE
    OBJECTS { ifIndex, ifAdminStatus, ifOperStatus }
    STATUS  current
    DESCRIPTION
            "A linkDown trap signifies that the SNMP entity, acting in
            an agent role, has detected that the ifOperStatus object for
            one of its communication links is about to enter the down
            state from some other state (but not from the notPresent
            state).  This other state is indicated by the included value
            of ifOperStatus."
    ::= { snmpTraps 3 }

linkUp NOTIFICATION-TYPE
    OBJECTS { ifIndex, ifAdminStatus, ifOperStatus }
    STATUS  current
    DESCRIPTION
            "A linkUp trap signifies that the SNMP entity, acting in an
            agent role, has detected that the ifOperStatus object for
            one of its communication links left the down state and
            transitioned into some other state (but not into the
            notPresent state).  This other state is indicated by the
            included value of ifOperStatus."
    ::= { snmpTraps 4 }

-- conformance information


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