Topology Independent Fast Reroute using Segment Routing
draft-bashandy-rtgwg-segment-routing-ti-lfa-01

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Last updated 2017-07-17
Replaces draft-francois-rtgwg-segment-routing-ti-lfa
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Network Working Group                                       A. Bashandy
Internet Draft                                              C. Filsfils
Intended status: Standards Track                          Cisco Systems
Expires: January 2018                                    Bruno Decraene
                                                     Stephane Litkowski
                                                                  Orange
                                                         Pierre Francois
                                                  Individual Contributor
                                                          July 17, 2017

          Topology Independent Fast Reroute using Segment Routing
              draft-bashandy-rtgwg-segment-routing-ti-lfa-01

Abstract

   This document presents Topology Independent Loop-free Alternate Fast
   Re-route (TI-LFA), aimed at providing protection of node and
   adjacency segments within the Segment Routing (SR) framework.  This
   Fast Re-route (FRR) behavior builds on proven IP-FRR concepts being
   LFAs, remote LFAs (RLFA), and remote LFAs with directed forwarding
   (DLFA).  It extends these concepts to provide guaranteed coverage in
   any IGP network.  A key aspect of TI-LFA is the FRR path selection
   approach establishing protection over post-convergence paths from
   the point of local repair, dramatically reducing the operational
   need to control the tie-breaks among various FRR options.

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Bashandy              Expires December 16, 2017                [Page 1]
Internet-Draft                SR TI-LFA                       June 2017

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Table of Contents

   1. Introduction...................................................3
      1.1. Conventions used in this document.........................5
   2. Terminology....................................................5
   3. Intersecting P-Space and Q-Space with post-convergence paths...6
      3.1. P-Space property computation for a resource X.............6
      3.2. Q-Space property computation for a link S-F, over post-
      convergence paths..............................................6
      3.3. Q-Space property computation for a set of links adjacent to
      S, over post-convergence paths.................................6
      3.4. Q-Space property computation for a node F, over post-
      convergence paths..............................................7
   4. TI-LFA Repair Tunnel...........................................7
      4.1. The repair node is a direct neighbor......................7
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