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Remote Loop-Free Alternate (LFA) Fast Reroute (FRR) (RFC7490) Disclosure Number: IPCOM000241400D
Original Publication Date: 2015-Apr-01
Included in the Prior Art Database: 2015-Apr-23
Document File: 58 page(s) / 66K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

S. Bryant: AUTHOR [+5]


RFC 5714 [RFC5714] describes a framework for IP Fast Reroute (IPFRR) and provides a summary of various proposed IPFRR solutions. A basic mechanism using Loop-Free Alternates (LFAs) is described in [RFC5286] that provides good repair coverage in many topologies [RFC6571], especially those that are highly meshed. However, some topologies, notably ring-based topologies, are not well protected by LFAs alone. This is because there is no neighbor of the Point of Local Repair (PLR) that has a cost to the destination via a path that does not traverse the failure that is cheaper than the cost to the destination via the failure.

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Internet Engineering Task Force (IETF)                         S. Bryant Request for Comments: 7490                                   C. Filsfils Category: Standards Track                                     S. Previdi ISSN: 2070-1721                                            Cisco Systems                                                                 M. Shand                                                  Independent Contributor                                                                    N. So                                                            Vinci Systems                                                               April 2015

           Remote Loop-Free Alternate (LFA) Fast Reroute (FRR)


   This document describes an extension to the basic IP fast reroute    mechanism, described in RFC 5286, that provides additional backup    connectivity for point-to-point link failures when none can be    provided by the basic mechanisms.

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.

Bryant, et al.               Standards Track                    [Page 1]
 RFC 7490                     Remote LFA FRR                   April 2015

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