Experience with the BGP-4 protocol
RFC 1773

Document Type RFC - Informational (March 1995; No errata)
Obsoletes RFC 1656
Last updated 2013-03-02
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Network Working Group                                          P. Traina
Request for Comments: 1773                                 cisco Systems
Obsoletes: 1656                                               March 1995
Category: Informational

                   Experience with the BGP-4 protocol

Status of this Memo

   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.


   The purpose of this memo is to document how the requirements for
   advancing a routing protocol to Draft Standard have been satisfied by
   Border Gateway Protocol version 4 (BGP-4).  This report documents
   experience with BGP.  This is the second of two reports on the BGP
   protocol.  As required by the Internet Architecure Board (IAB) and
   the Internet Engineering Steering Group (IESG), the first report will
   present a performance analysis of the BGP protocol.

   The remaining sections of this memo document how BGP satisfies
   General Requirements specified in Section 3.0, as well as
   Requirements for Draft Standard specified in Section 5.0 of the
   "Internet Routing Protocol Standardization Criteria" document [1].

   This report is based on the initial work of Peter Lothberg (Ebone),
   Andrew Partan (Alternet), and several others.  Details of their work
   were presented at the Twenty-fifth IETF meeting and are available
   from the IETF proceedings.

   Please send comments to iwg@ans.net.


   The BGP protocol has been developed by the IDR (formerly BGP) Working
   Group of the Internet Engineering Task Force.  I would like to
   express deepest thanks to Yakov Rekhter and Sue Hares, co-chairs of
   the IDR working group.  I'd also like to explicitly thank Yakov
   Rekhter and Tony Li for the review of this document as well as
   constructive and valuable comments.

Traina                                                          [Page 1]
RFC 1773           Experience with the BGP-4 Protocol         March 1995


   BGP is an inter-autonomous system routing protocol designed for
   TCP/IP internets.  Version 1 of the BGP protocol was published in RFC
   1105. Since then BGP Versions 2, 3, and 4 have been developed.
   Version 2 was documented in RFC 1163. Version 3 is documented in RFC
   1267.  The changes between versions 1, 2 and 3 are explained in
   Appendix 2 of [2].  All of the functionality that was present in the
   previous versions is present in version 4.

   BGP version 2 removed from the protocol the concept of "up", "down",
   and "horizontal" relations between autonomous systems that were
   present in version 1.  BGP version 2 introduced the concept of path
   attributes.  In addition, BGP version 2 clarified parts of the
   protocol that were "under-specified".

   BGP version 3 lifted some of the restrictions on the use of the
   NEXT_HOP path attribute, and added the BGP Identifier field to the
   BGP OPEN message.  It also clarifies the procedure for distributing
   BGP routes between the BGP speakers within an autonomous system.

   BGP version 4 redefines the (previously class-based) network layer
   reachability portion of the updates to specify prefixes of arbitrary
   length in order to represent multiple classful networks in a single
   entry as discussed in [5].  BGP version 4 has also modified the AS-
   PATH attribute so that sets of autonomous systems, as well as
   individual ASs may be described.  In addition, BGP version for has
   redescribed the INTER-AS METRIC attribute as the MULTI-EXIT

   Possible applications of BGP in the Internet are documented in [3].

   The BGP protocol was developed by the IDR Working Group of the
   Internet Engineering Task Force. This Working Group has a mailing
   list, iwg@ans.net, where discussions of protocol features and
   operation are held. The IDR Working Group meets regularly during the
   quarterly Internet Engineering Task Force conferences. Reports of
   these meetings are published in the IETF's Proceedings.


   A BGP-4 Management Information Base has been published [4].  The MIB
   was written by Steve Willis (Wellfleet), John Burruss (Wellfleet),
   and John Chu (IBM).

   Apart from a few system variables, the BGP MIB is broken into two
   tables: the BGP Peer Table and the BGP Received Path Attribute Table.

Traina                                                          [Page 2]
RFC 1773           Experience with the BGP-4 Protocol         March 1995

   The Peer Table reflects information about BGP peer connections, such
   as their state and current activity. The Received Path Attribute
   Table contains all attributes received from all peers before local
   routing policy has been applied. The actual attributes used in
   determining a route are a subset of the received attribute table.
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