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Advertisement of Multiple Paths in BGP (RFC7911)

IP.com Disclosure Number: IPCOM000246880D
Original Publication Date: 2016-Jul-01
Included in the Prior Art Database: 2016-Jul-12
Document File: 16 page(s) / 18K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Walton: AUTHOR [+4]

Abstract

The BGP specification [RFC4271] defines an Update-Send Process to advertise the routes chosen by the Decision Process to other BGP speakers. No provisions are made to allow the advertisement of multiple paths for the same address prefix or Network Layer Reachability Information (NLRI). In fact, a route with the same NLRI as a previously advertised route implicitly replaces the previous advertisement.

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Internet Engineering Task Force (IETF)                         D. Walton Request for Comments: 7911                              Cumulus Networks Category: Standards Track                                      A. Retana ISSN: 2070-1721                                                  E. Chen                                                      Cisco Systems, Inc.                                                               J. Scudder                                                         Juniper Networks                                                                July 2016

                  Advertisement of Multiple Paths in BGP

Abstract

   This document defines a BGP extension that allows the advertisement    of multiple paths for the same address prefix without the new paths    implicitly replacing any previous ones.  The essence of the extension    is that each path is identified by a Path Identifier in addition to    the address prefix.

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 7841.

   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/rfc7911.

Copyright Notice

   Copyright (c) 2016 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.

Walton, et al.               Standards Track                    [Page 1]
 RFC 7911                        ADD-PATH                       July 2016

 Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . ....