if-mib

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       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.  This object is a 64-bit version of
               ifInMulticastPkts."
       ::= { 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."
       ::= { 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."
       ::= { ifXEntry 10 }

   ifHCOutUcastPkts 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 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."
       ::= { 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."
       ::= { 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."
       ::= { ifXEntry 13 }

   ifLinkUpDownTrapEnable  OBJECT-TYPE
       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
       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 }


   --           The Interface Stack Group
   --
   -- Implementation of this group is mandatory 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.  Each
               sub-layer corresponds to a conceptual row in the
               ifTable."
        ::= { ifMIBObjects 2 }


   ifStackEntry  OBJECT-TYPE
        SYNTAX        IfStackEntry
        MAX-ACCESS    not-accessible
        STATUS        current
        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  Integer32,
           ifStackLowerLayer   Integer32,
           ifStackStatus       RowStatus
        }


   ifStackHigherLayer  OBJECT-TYPE
        SYNTAX        Integer32
        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        Integer32
        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
               "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 }


   --
   --    The Interface Test Table
   --
   -- This group of objects is optional.  However, a media-specific
   -- MIB may make implementation of this group mandatory.
   --
   -- This table replaces the ifExtnsTestTable
   --

   ifTestTable   OBJECT-TYPE
       SYNTAX      SEQUENCE OF IfTestEntry
       MAX-ACCESS  not-accessible
       STATUS      deprecated
       DESCRIPTION
               "This table contains one entry per interface.  It
               defines objects which allow a network manager to
               instruct an agent to test an interface for various
               faults.  Tests for an interface are defined in the
               media-specific MIB for that interface.  After invoking
               a test, the object ifTestResult can be read to
               determine the outcome.  If an agent can not perform
               the test, ifTestResult is set to so indicate.  The
               object ifTestCode can be used to provide further
               test-specific or interface-specific (or even
               enterprise-specific) information concerning the
               outcome of the test.  Only one test can be in progress
               on each interface at any one time.  If one test is in
               progress when another test is invoked, the second test
               is rejected.  Some agents may reject a test when a
               prior test is active on another interface.
               Before starting a test, a manager-station must first
               obtain 'ownership' of the entry in the ifTestTable for
               the interface to be tested.  This is accomplished with
               the ifTestId and ifTestStatus objects as follows:

            try_again:
                get (ifTestId, ifTestStatus)
                while (ifTestStatus != notInUse)
                    /*
                     * Loop while a test is running or some other
                     * manager is configuring a test.
                     */
                    short delay
                    get (ifTestId, ifTestStatus)
                }

                /*
                 * Is not being used right now -- let's compete
                 * to see who gets it.
                 */
                lock_value = ifTestId

                if ( set(ifTestId = lock_value, ifTestStatus = inUse,
                         ifTestOwner = 'my-IP-address') == FAILURE)