Autonomous System Migration Mechanisms and Their Effects on the BGP AS_PATH Attribute (RFC7705)
Original Publication Date: 2015-Nov-01
Included in the Prior Art Database: 2016-Feb-07
Internet Society Requests For Comment (RFCs)
W. George: AUTHOR [+2]
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.
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 http://www.rfc-editor.org/info/rfc7705.
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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