Topology Independent Fast Reroute using Segment Routing
draft-bashandy-rtgwg-segment-routing-ti-lfa-05
Network Working Group A. Bashandy
Internet Draft Arrcus
Intended status: Standard Track C. Filsfils
Expires: April 2019 Cisco Systems
Bruno Decraene
Stephane Litkowski
Orange
Pierre Francois
INSA Lyon
D. Voyer
Bell Canada
Francois Clad
Pablo Camarillo
Cisco Systems
October 4, 2018
Topology Independent Fast Reroute using Segment Routing
draft-bashandy-rtgwg-segment-routing-ti-lfa-05
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 April 4, 2019 [Page 1]
Internet-Draft SR TI-LFA October 2018
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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.................................7
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