SR Path Ingress Protection
draft-chen-pce-sr-ingress-protection-00

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Last updated 2019-07-06
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Network Working Group                                            H. Chen
Internet-Draft                                                 Futurewei
Intended status: Standards Track                                  M. Toy
Expires: January 7, 2020                                         Verizon
                                                                 A. Wang
                                                           China Telecom
                                                                   Z. Li
                                                            China Mobile
                                                                  L. Liu
                                                                 Fujitsu
                                                                  X. Liu
                                                          Volta Networks
                                                            July 6, 2019

                       SR Path Ingress Protection
                draft-chen-pce-sr-ingress-protection-00

Abstract

   This document describes protocol extensions and procedures for
   protecting the ingress node of a Segment Routing (SR) path.

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
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on January 7, 2020.

Chen, et al.             Expires January 7, 2020                [Page 1]
Internet-Draft            SR Ingress Protection                July 2019

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminologies . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  SR Path Ingress Protection Example  . . . . . . . . . . . . .   3
   4.  Behavior after Ingress Failure  . . . . . . . . . . . . . . .   4
   5.  Extensions to PCE . . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Capability for SR Path Ingress Protection . . . . . . . .   5
     5.2.  SR Path Ingress Protection  . . . . . . . . . . . . . . .   6
       5.2.1.  Traffic-Description sub-TLV . . . . . . . . . . . . .   7
       5.2.2.  Primary-Ingress sub-TLV . . . . . . . . . . . . . . .  10
       5.2.3.  Service sub-TLV . . . . . . . . . . . . . . . . . . .  11
       5.2.4.  Downstream-Node sub-TLV . . . . . . . . . . . . . . .  12
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   Fast protection of a transit node of a Segment Routing (SR) path is
   described in [I-D.bashandy-rtgwg-segment-routing-ti-lfa] and
   [I-D.hu-spring-segment-routing-proxy-forwarding].  However, these
   documents do not discuss the procedures for fast protection of the
   ingress node of an SR path.

   This document fills that void and specifies protocol extensions and
   procedures for fast protection of the ingress node of an SR path.
   Ingress node and ingress as well as fast protection and protection
   will be used exchangeably.
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