Autonomous System (AS) Migration Features and Their Effects on the BGP AS_PATH Attribute
draft-ga-idr-as-migration-02

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Last updated 2013-07-10
Replaced by draft-ietf-idr-as-migration, rfc7705
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Internet Engineering Task Force                                W. George
Internet-Draft                                         Time Warner Cable
Intended status: Informational                                 S. Amante
Expires: January 11, 2014                         Level 3 Communications
                                                           July 10, 2013

 Autonomous System (AS) Migration Features and Their Effects on the BGP
                           AS_PATH Attribute
                      draft-ga-idr-as-migration-02

Abstract

   This draft discusses common methods of managing an ASN migration
   using some BGP feaures that while commonly-used are not formally part
   of the BGP4 protocol specification and may be vendor-specific in
   exact implementation.  It is necessary to document these de facto
   standards to ensure that they are properly supported in BGPSec.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 11, 2014.

Copyright Notice

   Copyright (c) 2013 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of

George & Amante         Expires January 11, 2014                [Page 1]
Internet-Draft            AS Migration Features                July 2013

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Documentation note  . . . . . . . . . . . . . . . . . . .   3
   2.  ASN Migration Scenario Overview . . . . . . . . . . . . . . .   3
   3.  External BGP Autonomous System Migration Features . . . . . .   5
     3.1.  Local AS: Modify Inbound BGP AS_PATH Attribute  . . . . .   6
     3.2.  Replace AS: Modify Outbound BGP AS_PATH Attribute . . . .   7
   4.  Internal BGP Autonomous System Migration Features . . . . . .   8
     4.1.  Internal BGP Alias  . . . . . . . . . . . . . . . . . . .   9
   5.  Additional Operational Considerations . . . . . . . . . . . .  11
   6.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .  12
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     10.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   This draft discusses common methods of managing an ASN migration
   using some BGP features that while commonly-used are not formally
   part of the BGP4 [RFC4271] protocol specification and may be vendor-
   specific in exact implementation.  This draft does not attempt to
   standardize these features, because they are local to given
   implementation and do not require negotiation with or cooperation of
   BGP neighbors.  The deployment of these features do not need to
   interwork with one another to accomplish the desired results.
   However, it is necessary to document these de facto standards to
   ensure that 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
   features.

   It is important to understand the business need for these features
   and illustrate why they are critical, particularly for ISP's
   operations.  However, these features are not limited to ISP's and
   that organizations of all sizes use these features for similar
   reasons to ISPs.  During a merger, acquisition or divestiture
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