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Autonomous System Migration Mechanisms and Their Effects on the BGP AS_PATH Attribute (RFC7705) Disclosure Number: IPCOM000245059D
Original Publication Date: 2015-Nov-01
Included in the Prior Art Database: 2016-Feb-07
Document File: 32 page(s) / 41K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. George: AUTHOR [+1]


This document discusses some existing commonly used BGP mechanisms for Autonomous System Number (ASN) migration that are not formally part of the BGP4 [RFC4271] protocol specification. These mechanisms are local to a given BGP speaker and do not require negotiation with or cooperation of BGP neighbors. The deployment of these mechanisms do not need to interwork with one another to accomplish the desired results, so slight variations between existing vendor implementations exist and will not necessarily be harmonized due to this document. However, it is necessary to document these de facto standards to ensure that new implementations can be successful, and any future protocol enhancements to BGP that propose to read, copy, manipulate, or compare the AS_PATH attribute can do so without inhibiting the use of these very widely used ASN migration mechanisms.

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Internet Engineering Task Force (IETF)                         W. George Request for Comments: 7705                             Time Warner Cable Updates: 4271                                                  S. Amante Category: Standards Track                                    Apple, Inc. ISSN: 2070-1721                                            November 2015

                  Autonomous System Migration Mechanisms              and Their Effects on the BGP AS_PATH Attribute


   This document discusses some existing commonly used BGP mechanisms    for Autonomous System Number (ASN) migration that are not formally    part of the BGP4 protocol specification.  It is necessary to document    these de facto standards to ensure that they are properly supported    in future BGP protocol work.

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

Copyright Notice

   Copyright (c) 2015 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    ( 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.

George & Amante              Standards Track                    [Page 1]
 RFC 7705                  AS Migration Features            November 2015

 Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2

     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3

     1.2.  Documentation Note  . . . . . . . . . . . . . . . . . . .   3

   2.  ASN Migration Scenario Overview . . . . . . . . . . . . . . .   3

   3.  External BGP Autonomous System Migration Mechanisms . . . . .   5