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Remote-LFA Node Protection and Manageability (RFC8102) Disclosure Number: IPCOM000249636D
Original Publication Date: 2017-Mar-01
Included in the Prior Art Database: 2017-Mar-10
Document File: 44 page(s) / 50K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Sarkar: AUTHOR [+5]


The Remote-LFA specification [RFC7490] provides loop-free alternates that guarantee only link protection. The resulting remote-LFA alternate next hops (also referred to as the "PQ-nodes") may not provide node protection for all destinations covered by the same remote-LFA alternate, in case of failure of the primary next-hop node, and it does not provide a means to determine the same.

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Internet Engineering Task Force (IETF)                    P. Sarkar, Ed. Request for Comments: 8102                                  Arrcus, Inc. Category: Standards Track                                       S. Hegde ISSN: 2070-1721                                                C. Bowers                                                   Juniper Networks, Inc.                                                               H. Gredler                                                            RtBrick, Inc.                                                             S. Litkowski                                                                   Orange                                                               March 2017

               Remote-LFA Node Protection and Manageability


   The loop-free alternates (LFAs) computed following the current    remote-LFA specification guarantees only link protection.  The    resulting remote-LFA next hops (also called "PQ-nodes") may not    guarantee node protection for all destinations being protected by it.

   This document describes an extension to the remote-loop-free-based IP    fast reroute mechanisms that specifies procedures for determining    whether or not a given PQ-node provides node protection for a    specific destination.  The document also shows how the same procedure    can be utilized for the collection of complete characteristics for    alternate paths.  Knowledge about the characteristics of all    alternate paths is a precursor to applying the operator-defined    policy for eliminating paths not fitting the constraints.

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

 Sarkar, et al.               Standards Track                    [Page 1]
 RFC 8102         R-LFA Node Protection and Manageability      March 2017

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