Abstract
draft-bashandy-rtgwg-segment-routing-ti-lfa-00

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Last updated 2017-02-16
Replaces draft-francois-rtgwg-segment-routing-ti-lfa
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Network Working Group                                       A. Bashandy
Internet Draft                                              C. Filsfils
Intended status: Informational                            Cisco Systems
Expires: August 2017                                     Bruno Decraene
                                                     Stephane Litkowski
                                                                  Orange
                                                         Pierre Francois
                                                  Individual Contributor
                                                      February 16, 2017
         Topology Independent Fast Reroute using Segment Routing
             draft-bashandy-rtgwg-segment-routing-ti-lfa-00

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 August 16, 2017                 [Page 1]
Internet-Draft                SR TI-LFA                   February 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
      4.2. The repair node is a PQ node..............................7
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