SRv6 Path Egress Protection
draft-hu-rtgwg-srv6-egress-protection-02

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Last updated 2019-07-08
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Network Working Group                                              Z. Hu
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                                 H. Chen
Expires: January 9, 2020                                       Futurewei
                                                                 H. Chen
                                                           China Telecom
                                                                   P. Wu
                                                     Huawei Technologies
                                                            July 8, 2019

                      SRv6 Path Egress Protection
                draft-hu-rtgwg-srv6-egress-protection-02

Abstract

   This document describes protocol extensions and procedures for
   protecting the egress node of a Segment Routing for IPv6 (SRv6) 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 9, 2020.

Copyright Notice

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

Hu, et al.               Expires January 9, 2020                [Page 1]
Internet-Draft              Egress Protection                  July 2019

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminologies . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  SR Path Egress Protection . . . . . . . . . . . . . . . . . .   4
   4.  Extensions to IGP for Egress Protection . . . . . . . . . . .   5
     4.1.  Extensions to IS-IS . . . . . . . . . . . . . . . . . . .   5
     4.2.  Extensions to OSPF  . . . . . . . . . . . . . . . . . . .   7
   5.  Behavior for SRv6 Mirror SID  . . . . . . . . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

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
   egress node of a Segment Routing for IPv6 (SRv6) path.

   [RFC8400] describes the fast protection of egress node(s) of an MPLS
   TE LSP tunnel including P2P TE LSP tunnel and P2MP TE LSP tunnel in
   details.

   This document specifies protocol extensions and procedures for fast
   protection of the egress node of an SRv6 path.  Egress node and
   egress as well as fast protection and protection will be used
   exchangeably.

Hu, et al.               Expires January 9, 2020                [Page 2]
Internet-Draft              Egress Protection                  July 2019

2.  Terminologies

   The following terminologies are used in this document.

   SR:  Segment Routing

   SRv6:  SR for IPv6

   SRH:  Segment Routing Header

   SID:  Segment Identifier

   LSP:  Label Switched Path
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