Node Protection for SR-TE Paths
draft-hegde-spring-node-protection-for-sr-te-paths-02

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Routing area                                                    S. Hegde
Internet-Draft                                                 C. Bowers
Intended status: Informational                    Juniper Networks, Inc.
Expires: May 3, 2018                                        S. Litkowski
                                                                  Orange
                                                        October 30, 2017

                    Node Protection for SR-TE Paths
         draft-hegde-spring-node-protection-for-sr-te-paths-02

Abstract

   Segment routing supports the creation of explicit paths using
   adjacency-sids, node-sids, and binding-sids.  It is important to
   provide fast reroute (FRR) mechanisms to respond to failures of links
   and nodes in the Segment-Routed Traffic-Engineered(SR-TE) path.  A
   point of local repair (PLR) can provide FRR protection against the
   failure of a link in an SR-TE path by examining only the first (top)
   label in the SR label stack.  In order to protect against the failure
   of a node, a PLR may need to examine the second label in the stack as
   well in order to determine SR-TE path beyond the failed node.  This
   document specifies how a PLR can use the first and second label in
   the label stack describing an SR-TE path to provide protection
   against node failures.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 3, 2018.

Hegde, et al.              Expires May 3, 2018                  [Page 1]
Internet-Draft       Node Protection for SR-TE Paths        October 2017

Copyright Notice

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Node Failures Along SR-TE Paths . . . . . . . . . . . . . . .   3
     2.1.  Node protection for node-sid explicit paths . . . . . . .   3
     2.2.  Node-Protection for Anycast-SIDs  . . . . . . . . . . . .   4
     2.3.  Node-protection for adj-sid explicit paths  . . . . . . .   5
     2.4.  Node-protection of binding-sid explicit paths . . . . . .   6
   3.  Detailed Solution using Context Tables  . . . . . . . . . . .   6
     3.1.  Building Context Tables . . . . . . . . . . . . . . . . .   6
     3.2.  Node protection for node SIDs . . . . . . . . . . . . . .   7
     3.3.  Node protection for ajacency SIDs . . . . . . . . . . . .   8
     3.4.  Node protection for binding sids  . . . . . . . . . . . .   9
     3.5.  Node protection for edge nodes  . . . . . . . . . . . . .  11
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  13
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   It is possible for a routing device to completely go out of service
   abruptly due to power failure, hardware failure or software crashes.
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