rfc1657.txt

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                         OCTET STRING,
                    bgp4PathAttrNextHop
                         IpAddress,
                    bgp4PathAttrMultiExitDisc
                         INTEGER,
                    bgp4PathAttrLocalPref
                         INTEGER,
                    bgp4PathAttrAtomicAggregate
                         INTEGER,
                    bgp4PathAttrAggregatorAS
                         INTEGER,
                    bgp4PathAttrAggregatorAddr
                         IpAddress,
                    bgp4PathAttrCalcLocalPref
                         INTEGER,
                    bgp4PathAttrBest
                         INTEGER,
                    bgp4PathAttrUnknown
                         OCTET STRING

                }

                bgp4PathAttrPeer OBJECT-TYPE
                    SYNTAX     IpAddress
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "The IP address of the peer where the path
                            information was learned."
                    ::= { bgp4PathAttrEntry 1 }

                bgp4PathAttrIpAddrPrefixLen OBJECT-TYPE
                    SYNTAX     INTEGER (0..32)
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "Length in bits of the IP address prefix
                            in the Network Layer Reachability
                            Information field."
                    ::= { bgp4PathAttrEntry 2 }

                bgp4PathAttrIpAddrPrefix OBJECT-TYPE
                    SYNTAX     IpAddress
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "An IP address prefix in the Network Layer
                            Reachability Information field.  This object



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RFC 1657                       BGP-4 MIB                       July 1994


                            is an IP address containing the prefix with
                            length specified by
                            bgp4PathAttrIpAddrPrefixLen.
                            Any bits beyond the length specified by
                            bgp4PathAttrIpAddrPrefixLen are zeroed."
                    ::= { bgp4PathAttrEntry 3 }

                bgp4PathAttrOrigin OBJECT-TYPE
                    SYNTAX     INTEGER {
                                         igp(1),-- networks are interior
                                         egp(2),-- networks learned
                                                -- via EGP
                                         incomplete(3) -- undetermined
                                       }
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "The ultimate origin of the path
                            information."
                    ::= { bgp4PathAttrEntry 4 }

                bgp4PathAttrASPathSegment OBJECT-TYPE
                    SYNTAX     OCTET STRING (SIZE (2..255))
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "The sequence of AS path segments.  Each AS
                            path segment is represented by a triple
                            <type, length, value>.

                            The type is a 1-octet field which has two
                            possible values:
                                 1      AS_SET: unordered set of ASs a
                                             route in the UPDATE
                                             message has traversed
                                 2      AS_SEQUENCE: ordered set of ASs
                                             a route in the UPDATE
                                             message has traversed.

                            The length is a 1-octet field containing the
                            number of ASs in the value field.

                            The value field contains one or more AS
                            numbers, each AS is represented in the octet
                            string as a pair of octets according to the
                            following algorithm:





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RFC 1657                       BGP-4 MIB                       July 1994


                                first-byte-of-pair = ASNumber / 256;
                                second-byte-of-pair = ASNumber & 255;"
                    ::= { bgp4PathAttrEntry 5 }

                bgp4PathAttrNextHop OBJECT-TYPE
                    SYNTAX     IpAddress
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "The address of the border router that
                            should be used for the destination
                            network."
                    ::= { bgp4PathAttrEntry 6 }

                bgp4PathAttrMultiExitDisc OBJECT-TYPE
                    SYNTAX     INTEGER (-1..2147483647)
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "This metric is used to discriminate
                            between multiple exit points to an
                            adjacent autonomous system.  A value of -1
                            indicates the absence of this attribute."
                    ::= { bgp4PathAttrEntry 7 }

                bgp4PathAttrLocalPref OBJECT-TYPE
                    SYNTAX     INTEGER (-1..2147483647)
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "The originating BGP4 speaker's degree of
                            preference for an advertised route.  A
                            value of -1 indicates the absence of this
                            attribute."
                    ::= { bgp4PathAttrEntry 8 }

                bgp4PathAttrAtomicAggregate OBJECT-TYPE
                    SYNTAX     INTEGER {
                                   lessSpecificRrouteNotSelected(1),
                                   lessSpecificRouteSelected(2)
                               }
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "Whether or not the local system has
                            selected a less specific route without
                            selecting a more specific route."
                    ::= { bgp4PathAttrEntry 9 }



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RFC 1657                       BGP-4 MIB                       July 1994


                bgp4PathAttrAggregatorAS OBJECT-TYPE
                    SYNTAX     INTEGER (0..65535)
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "The AS number of the last BGP4 speaker that
                            performed route aggregation.  A value of
                            zero (0) indicates the absence of this
                            attribute."
                    ::= { bgp4PathAttrEntry 10 }

                bgp4PathAttrAggregatorAddr OBJECT-TYPE
                    SYNTAX     IpAddress
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "The IP address of the last BGP4 speaker
                            that performed route aggregation.  A value
                            of 0.0.0.0 indicates the absence of this
                            attribute."
                    ::= { bgp4PathAttrEntry 11 }

                bgp4PathAttrCalcLocalPref OBJECT-TYPE
                    SYNTAX     INTEGER (-1..2147483647)
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "The degree of preference calculated by the
                            receiving BGP4 speaker for an advertised
                            route.  A value of -1 indicates the
                            absence of this attribute."
                    ::= { bgp4PathAttrEntry 12 }

                bgp4PathAttrBest OBJECT-TYPE
                    SYNTAX     INTEGER {
                                   false(1),-- not chosen as best route
                                   true(2) -- chosen as best route
                               }
                    MAX-ACCESS read-only
                    STATUS     current
                    DESCRIPTION
                            "An indication of whether or not this route
                            was chosen as the best BGP4 route."
                    ::= { bgp4PathAttrEntry 13 }

               bgp4PathAttrUnknown OBJECT-TYPE
                    SYNTAX     OCTET STRING (SIZE(0..255))
                    MAX-ACCESS read-only



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RFC 1657                       BGP-4 MIB                       July 1994


                    STATUS     current
                    DESCRIPTION
                            "One or more path attributes not understood
                             by this BGP4 speaker.  Size zero (0)
                             indicates the absence of such
                             attribute(s).  Octets beyond the maximum
                             size, if any, are not recorded by this
                             object."
                    ::= { bgp4PathAttrEntry 14 }


                -- Traps.

                bgpTraps                OBJECT IDENTIFIER ::= { bgp 7 }

                bgpEstablished NOTIFICATION-TYPE
                    OBJECTS { bgpPeerLastError,
                              bgpPeerState      }
                    STATUS  current
                    DESCRIPTION
                            "The BGP Established event is generated when
                            the BGP FSM enters the ESTABLISHED state."
                    ::= { bgpTraps 1 }

                bgpBackwardTransition NOTIFICATION-TYPE
                    OBJECTS { bgpPeerLastError,
                              bgpPeerState      }
                    STATUS  current
                    DESCRIPTION
                            "The BGPBackwardTransition Event is generated
                            when the BGP FSM moves from a higher numbered
                            state to a lower numbered state."
                    ::= { bgpTraps 2 }

END
















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RFC 1657                       BGP-4 MIB                       July 1994


6. Acknowledgements

   We would like to acknowledge the assistance of all the members of the
   Interconnectivity Working Group, and particularly the following
   individuals:

        Yakov Rekhter, IBM
        Rob Coltun, University of Maryland
        Guy Almes, ANS
        Jeff Honig, Cornell Theory Center
        Marshall T. Rose, Dover Beach Consulting, Inc.
        Dennis Ferguson, ANS
        Mike Mathis, PSC
        John Krawczyk, Wellfleet Communications Inc.
        Curtis Villamizar, ANS
        Dave LeRoy, Pencom Systems
        Paul Traina, cisco Systems
        Andrew Partan, UUNET
        Robert Snyder, cisco Systems
        Dimitry Haskin, Wellfleet Communications Inc.
        Peder Chr Norgaard, Telebit Communications A/S
        Joel Halpern, Network Systems Corporation

7. References

   [1] Rekhter, Y., and T. Li, "A Border Gateway Protocol 4 (BGP-4)",
       RFC 1654,  T.J. Watson Research Center, IBM Corp., cisco Systems,
       July 1994.

   [2] Rekhter, Y., and P. Gross, Editors, "Application of the Border
       Gateway Protocol in the Internet", RFC 1655 T.J. Watson Research
       Center, IBM Corp., MCI, July 1994.

8. Security Considerations

   Security issues are not discussed in this memo.















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RFC 1657                       BGP-4 MIB                       July 1994


9.  Authors' Addresses

   Steven Willis
   Wellfleet Communications Inc.
   15 Crosby Drive
   Bedford, MA 01730

   Phone: [phone]
   EMail: [e-mail]


   John Burruss
   Wellfleet Communications Inc.
   15 Crosby Drive
   Bedford, MA 01730

   Phone: [phone]
   EMail: [e-mail]


   John Chu
   IBM Corp.
   P.O.Box 218
   Yorktown Heights, NY 10598

   Phone: [phone]
   EMail: [e-mail]
























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