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3.7. OSPF Interface Table Connected: An Internet Encyclopedia
3.7. OSPF Interface Table

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3.7. OSPF Interface Table

3.7. OSPF Interface Table

--  OSPF Interface Table

--      The OSPF Interface Table augments the ipAddrTable
--             with OSPF specific information.

    ospfIfTable OBJECT-TYPE
        SYNTAX   SEQUENCE OF OspfIfEntry
        MAX-ACCESS   not-accessible
        STATUS   current
        DESCRIPTION
           "The OSPF Interface Table describes the  inter-
           faces from the viewpoint of OSPF."
       REFERENCE
          "OSPF Version 2, Appendix C.3  Router  interface
          parameters"
      ::= { ospf 7 }


    ospfIfEntry OBJECT-TYPE
        SYNTAX   OspfIfEntry
        MAX-ACCESS   not-accessible
        STATUS   current
        DESCRIPTION
           "The OSPF Interface Entry describes one  inter-
           face from the viewpoint of OSPF."
       INDEX { ospfIfIpAddress, ospfAddressLessIf }
       ::= { ospfIfTable 1 }

OspfIfEntry ::=
    SEQUENCE {
        ospfIfIpAddress
            IpAddress,
        ospfAddressLessIf
            Integer32,
        ospfIfAreaId
            AreaID,
        ospfIfType
            INTEGER,
        ospfIfAdminStat
            Status,
        ospfIfRtrPriority
            DesignatedRouterPriority,
        ospfIfTransitDelay
            UpToMaxAge,
        ospfIfRetransInterval
            UpToMaxAge,
        ospfIfHelloInterval
            HelloRange,
        ospfIfRtrDeadInterval
            PositiveInteger,
        ospfIfPollInterval
            PositiveInteger,
        ospfIfState
            INTEGER,
        ospfIfDesignatedRouter
            IpAddress,
        ospfIfBackupDesignatedRouter
            IpAddress,
        ospfIfEvents
            Counter32,
        ospfIfAuthType
            INTEGER,
        ospfIfAuthKey
            OCTET STRING,
        ospfIfStatus
            RowStatus,
        ospfIfMulticastForwarding
            INTEGER,
        ospfIfDemand
            TruthValue
              }

    ospfIfIpAddress OBJECT-TYPE
        SYNTAX   IpAddress
        MAX-ACCESS   read-only
        STATUS   current
        DESCRIPTION
           "The IP address of this OSPF interface."
       ::= { ospfIfEntry 1 }

    ospfAddressLessIf OBJECT-TYPE
        SYNTAX   Integer32
        MAX-ACCESS   read-only
        STATUS   current
        DESCRIPTION
           "For the purpose of easing  the  instancing  of
           addressed   and  addressless  interfaces;  This
           variable takes the value 0 on  interfaces  with
           IP  Addresses,  and  the corresponding value of
           ifIndex for interfaces having no IP Address."
       ::= { ospfIfEntry 2 }
    ospfIfAreaId OBJECT-TYPE
        SYNTAX   AreaID
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "A 32-bit integer uniquely identifying the area
           to  which  the  interface  connects.   Area  ID
           0.0.0.0 is used for the OSPF backbone."
       DEFVAL   { '00000000'H }    -- 0.0.0.0
       ::= { ospfIfEntry 3 }

    ospfIfType OBJECT-TYPE
        SYNTAX   INTEGER    {
                    broadcast (1),
                    nbma (2),
                    pointToPoint (3),
                    pointToMultipoint (5)
                  }
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The OSPF interface type.

           By way of a default, this field may be intuited
           from the corresponding value of ifType.  Broad-
           cast LANs, such as  Ethernet  and  IEEE  802.5,
           take  the  value  'broadcast', X.25 and similar
           technologies take the value 'nbma',  and  links
           that  are  definitively point to point take the
           value 'pointToPoint'."
       ::= { ospfIfEntry 4 }


    ospfIfAdminStat OBJECT-TYPE
        SYNTAX   Status
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The OSPF  interface's  administrative  status.
           The  value formed on the interface, and the in-
           terface will be advertised as an internal route
           to  some  area.   The  value 'disabled' denotes
           that the interface is external to OSPF."
       DEFVAL { enabled }
       ::= { ospfIfEntry 5 }

    ospfIfRtrPriority OBJECT-TYPE
        SYNTAX   DesignatedRouterPriority
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The  priority  of  this  interface.   Used  in
           multi-access  networks,  this  field is used in
           the designated router election algorithm.   The
           value 0 signifies that the router is not eligi-
           ble to become the  designated  router  on  this
           particular  network.   In the event of a tie in
           this value, routers will use their Router ID as
           a tie breaker."
       DEFVAL { 1 }
       ::= { ospfIfEntry 6 }


    ospfIfTransitDelay OBJECT-TYPE
        SYNTAX   UpToMaxAge
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The estimated number of seconds  it  takes  to
           transmit  a  link state update packet over this
           interface."
       DEFVAL { 1 }
       ::= { ospfIfEntry 7 }


    ospfIfRetransInterval OBJECT-TYPE
        SYNTAX   UpToMaxAge
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The number of seconds between  link-state  ad-
           vertisement  retransmissions,  for  adjacencies
           belonging to this  interface.   This  value  is
           also used when retransmitting database descrip-
           tion and link-state request packets."
       DEFVAL { 5 }
       ::= { ospfIfEntry 8 }


    ospfIfHelloInterval OBJECT-TYPE
        SYNTAX   HelloRange
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The length of time, in  seconds,  between  the
           Hello  packets that the router sends on the in-
           terface.  This value must be the same  for  all
           routers attached to a common network."
       DEFVAL { 10 }
       ::= { ospfIfEntry 9 }


    ospfIfRtrDeadInterval OBJECT-TYPE
        SYNTAX   PositiveInteger
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The number of seconds that  a  router's  Hello
           packets  have  not been seen before it's neigh-
           bors declare the router down.  This  should  be
           some  multiple  of  the  Hello  interval.  This
           value must be the same for all routers attached
           to a common network."
       DEFVAL { 40 }
       ::= { ospfIfEntry 10 }


    ospfIfPollInterval OBJECT-TYPE
        SYNTAX   PositiveInteger
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The larger time interval, in seconds,  between
           the  Hello  packets  sent  to  an inactive non-
           broadcast multi- access neighbor."
       DEFVAL { 120 }
       ::= { ospfIfEntry 11 }


    ospfIfState OBJECT-TYPE
        SYNTAX   INTEGER    {
                    down (1),
                    loopback (2),
                    waiting (3),
                    pointToPoint (4),
                    designatedRouter (5),
                    backupDesignatedRouter (6),
                    otherDesignatedRouter (7)
                  }
        MAX-ACCESS   read-only
        STATUS   current
        DESCRIPTION
           "The OSPF Interface State."
       DEFVAL { down }
       ::= { ospfIfEntry 12 }


    ospfIfDesignatedRouter OBJECT-TYPE
        SYNTAX   IpAddress
        MAX-ACCESS   read-only
        STATUS   current
        DESCRIPTION
           "The IP Address of the Designated Router."
       DEFVAL   { '00000000'H }    -- 0.0.0.0
       ::= { ospfIfEntry 13 }


    ospfIfBackupDesignatedRouter OBJECT-TYPE
        SYNTAX   IpAddress
        MAX-ACCESS   read-only
        STATUS   current
        DESCRIPTION
           "The  IP  Address  of  the  Backup   Designated
           Router."
       DEFVAL   { '00000000'H }    -- 0.0.0.0
       ::= { ospfIfEntry 14 }

    ospfIfEvents OBJECT-TYPE
        SYNTAX   Counter32
        MAX-ACCESS   read-only
        STATUS   current
        DESCRIPTION
           "The number of times this  OSPF  interface  has
           changed its state, or an error has occurred."
       ::= { ospfIfEntry 15 }


    ospfIfAuthKey OBJECT-TYPE
        SYNTAX   OCTET STRING (SIZE (0..256))
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The Authentication Key.  If the Area's Author-
           ization  Type  is  simplePassword,  and the key
           length is shorter than 8 octets, the agent will
           left adjust and zero fill to 8 octets.

           Note that unauthenticated  interfaces  need  no
           authentication key, and simple password authen-
           tication cannot use a key of more  than  8  oc-
           tets.  Larger keys are useful only with authen-
           tication mechanisms not specified in this docu-
           ment.

           When read, ospfIfAuthKey always returns an  Oc-
           tet String of length zero."
       REFERENCE
          "OSPF Version 2, Section 9  The  Interface  Data
          Structure"
      DEFVAL   { '0000000000000000'H }    -- 0.0.0.0.0.0.0.0
      ::= { ospfIfEntry 16 }

    ospfIfStatus OBJECT-TYPE
        SYNTAX   RowStatus
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "This variable displays the status of  the  en-
           try.  Setting it to 'invalid' has the effect of
           rendering it inoperative.  The internal  effect
           (row removal) is implementation dependent."
       ::= { ospfIfEntry 17 }


    ospfIfMulticastForwarding OBJECT-TYPE
        SYNTAX   INTEGER    {
                            blocked (1),        -- no multicast forwarding
                            multicast (2),        -- using multicast address
                            unicast (3)        -- to each OSPF neighbor
                  }
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The way multicasts should  forwarded  on  this
           interface;  not  forwarded,  forwarded  as data
           link multicasts, or forwarded as data link uni-
           casts.   Data link multicasting is not meaning-
           ful on point to point and NBMA interfaces,  and
           setting ospfMulticastForwarding to 0 effective-
           ly disables all multicast forwarding."
       DEFVAL { blocked }
       ::= { ospfIfEntry 18 }


    ospfIfDemand OBJECT-TYPE
        SYNTAX   TruthValue
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "Indicates whether Demand OSPF procedures (hel-
           lo supression to FULL neighbors and setting the
           DoNotAge flag on proogated LSAs) should be per-
           formed on this interface."
       DEFVAL { false }
       ::= { ospfIfEntry 19 }


    ospfIfAuthType OBJECT-TYPE
        SYNTAX   INTEGER (0..255)
                    -- none (0),
                    -- simplePassword (1)
                    -- md5 (2)
                    -- reserved for specification by IANA (> 2)
        MAX-ACCESS   read-create
        STATUS   current
        DESCRIPTION
           "The authentication type specified for  an  in-
           terface.   Additional  authentication types may
           be assigned locally."
       REFERENCE
          "OSPF Version 2, Appendix E Authentication"
      DEFVAL { 0 }        -- no authentication, by default
      ::= { ospfIfEntry 20 }



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3.7. OSPF Interface Table

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