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+Internet Engineering Task Force (IETF)                           E. Chen
+Request for Comments: 6286                                       J. Yuan
+Updates: 4271                                              Cisco Systems
+Category: Standards Track                                      June 2011
+ISSN: 2070-1721
+
+
+         Autonomous-System-Wide Unique BGP Identifier for BGP-4
+
+Abstract
+
+   To accommodate situations where the current requirements for the BGP
+   Identifier are not met, this document relaxes the definition of the
+   BGP Identifier to be a 4-octet, unsigned, non-zero integer and
+   relaxes the "uniqueness" requirement so that only Autonomous-System-
+   wide (AS-wide) uniqueness of the BGP Identifiers is required.  These
+   revisions to the base BGP specification do not introduce any backward
+   compatibility issues.   This document updates RFC 4271.
+
+Status of This Memo
+
+   This is an Internet Standards Track document.
+
+   This document is a product of the Internet Engineering Task Force
+   (IETF).  It represents the consensus of the IETF community.  It has
+   received public review and has been approved for publication by the
+   Internet Engineering Steering Group (IESG).  Further information on
+   Internet Standards is available in Section 2 of RFC 5741.
+
+   Information about the current status of this document, any errata,
+   and how to provide feedback on it may be obtained at
+   http://www.rfc-editor.org/info/rfc6286.
+
+Copyright Notice
+
+   Copyright (c) 2011 IETF Trust and the persons identified as the
+   document authors.  All rights reserved.
+
+   This document is subject to BCP 78 and the IETF Trust's Legal
+   Provisions Relating to IETF Documents
+   (http://trustee.ietf.org/license-info) in effect on the date of
+   publication of this document.  Please review these documents
+   carefully, as they describe your rights and restrictions with respect
+   to this document.  Code Components extracted from this document must
+   include Simplified BSD License text as described in Section 4.e of
+   the Trust Legal Provisions and are provided without warranty as
+   described in the Simplified BSD License.
+
+
+
+
+Chen & Yuan                  Standards Track                    [Page 1]
+
+RFC 6286             AS-Wide Unique BGP ID for BGP-4           June 2011
+
+
+1.  Introduction
+
+   Currently, the BGP Identifier of a BGP speaker is specified as a
+   valid IPv4 host address assigned to the BGP speaker [RFC4271].  In
+   addition, the deployed BGP code requires that two BGP speakers be of
+   distinct BGP Identifiers in order to establish a BGP connection.
+
+   To accommodate situations where the current requirements for the BGP
+   Identifier are not met (such as in the case of an IPv6-only network),
+   this document relaxes the definition of the BGP Identifier to be a
+   4-octet, unsigned, non-zero integer and relaxes the "uniqueness"
+   requirement so that only AS-wide uniqueness of the BGP Identifiers is
+   required.  These revisions to the base BGP specification do not
+   introduce any backward compatibility issues.
+
+2.  Protocol Revisions
+
+   The revisions to the base BGP specification [RFC4271] include the
+   definition of the BGP Identifier and procedures for a BGP speaker
+   that supports the AS-wide Unique BGP Identifier.
+
+2.1.  Definition of the BGP Identifier
+
+   For a BGP speaker that supports the AS-wide Unique BGP Identifier,
+   the BGP Identifier is specified as the following:
+
+      The BGP Identifier is a 4-octet, unsigned, non-zero integer that
+      should be unique within an AS.  The value of the BGP Identifier
+      for a BGP speaker is determined on startup and is the same for
+      every local interface and every BGP peer.
+
+2.2.  Open Message Error Handling
+
+   For a BGP speaker that supports the AS-wide Unique BGP Identifier,
+   the OPEN message error handling related to the BGP Identifier is
+   modified as follows:
+
+      If the BGP Identifier field of the OPEN message is zero, or if it
+      is the same as the BGP Identifier of the local BGP speaker and the
+      message is from an internal peer, then the Error Subcode is set to
+      "Bad BGP Identifier".
+
+
+
+
+
+
+
+
+
+
+Chen & Yuan                  Standards Track                    [Page 2]
+
+RFC 6286             AS-Wide Unique BGP ID for BGP-4           June 2011
+
+
+2.3.  Connection Collision Resolution
+
+   For a BGP speaker that supports the AS-wide Unique BGP Identifier,
+   the procedures for connection collision resolution are extended as
+   follows to deal with the case in which the two BGP speakers share the
+   same BGP Identifier (thus, it is only applicable to an external
+   peer):
+
+      If the BGP Identifiers of the peers involved in the connection
+      collision are identical, then the connection initiated by the BGP
+      speaker with the larger AS number is preserved.
+
+   This extension covers cases in which the 4-octet AS numbers are
+   involved [RFC4893].
+
+3.  Remarks
+
+   It is noted that a BGP Identifier allocated based on [RFC4271] fits
+   the revised definition.
+
+   In case of BGP Confederation, the whole confederation is considered
+   as one AS for the purpose of supporting the AS-wide Unique BGP
+   Identifier.
+
+   A BGP speaker that supports the AS-wide Unique BGP Identifier cannot
+   share a BGP Identifier with its external neighbor until the remote
+   BGP speaker is upgraded with software that supports the specified
+   revisions.
+
+   In addition to the OPEN message, the BGP Identifier is currently also
+   used in the following areas:
+
+   o In the AGGREAGTOR attribute of a route where the combination of a
+     BGP Identifier and an AS number uniquely identifies the BGP speaker
+     that performs the route aggregation.
+
+   o In the Route Reflection within an AS, where only the BGP Identifier
+     of an internal neighbor may be propagated in the route reflection
+     related attributes.
+
+   o In the route selection, where the BGP Identifier is not used in
+     comparing a route from an internal neighbor and a route from an
+     external neighbor.  In addition, routes from BGP speakers with
+     identical BGP Identifiers have been dealt with (e.g., parallel BGP
+     sessions between two BGP speakers).
+
+
+
+
+
+
+Chen & Yuan                  Standards Track                    [Page 3]
+
+RFC 6286             AS-Wide Unique BGP ID for BGP-4           June 2011
+
+
+   Therefore, it is concluded that the revisions specified in this
+   document do not introduce any backward compatibility issues with the
+   current usage of the BGP Identifier.
+
+4.  Security Considerations
+
+   This extension to BGP does not introduce new security considerations.
+   BGP security considerations are discussed in [RFC4271].
+
+5.  Acknowledgments
+
+   The authors would like to thank members of the IDR Working Group for
+   discussions on the "IPv6-only Network" related issues that inspired
+   this document.
+
+6.  Normative References
+
+   [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A Border
+             Gateway Protocol 4 (BGP-4)", RFC 4271, January 2006.
+
+   [RFC4893] Vohra, Q. and E. Chen, "BGP Support for Four-octet AS
+             Number Space", RFC 4893, May 2007.
+
+Authors' Addresses
+
+   Enke Chen
+   Cisco Systems, Inc.
+   170 W. Tasman Dr.
+   San Jose, CA 95134
+
+   EMail: enkechen@cisco.com
+
+   Jenny Yuan
+   Cisco Systems, Inc.
+   170 W. Tasman Dr.
+   San Jose, CA 95134
+
+   EMail: jenny@cisco.com
+
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+Chen & Yuan                  Standards Track                    [Page 4]
+