Remote Loop-Free Alternate (LFA) Fast Reroute (FRR) (RFC7490)
Original Publication Date: 2015-Apr-01
Included in the Prior Art Database: 2015-Apr-23
Internet Society Requests For Comment (RFCs)
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.
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 http://www.rfc-editor.org/info/rfc7490.
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al. Standards Track [Page 1]
RFC 7490 Remote LFA FRR April 2015
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