SRv6 Midpoint Protection
draft-chen-rtgwg-srv6-midpoint-protection-02

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Network Working Group                                            H. Chen
Internet-Draft                                             China Telecom
Intended status: Experimental                                      Z. Hu
Expires: December 4, 2020                            Huawei Technologies
                                                                 H. Chen
                                                               Futurewei
                                                                 X. Geng
                                                     Huawei Technologies
                                                           June 02, 2020

                        SRv6 Midpoint Protection
              draft-chen-rtgwg-srv6-midpoint-protection-02

Abstract

   The previous work in IETF has provided some mechanism, e.g., TI-LFA,
   that allows local repair actions on the direct neighbors of the
   failed node to temporarily route traffic to the destination.  These
   mechanism could not work properly when the failure happens in the
   destination point or the link connected to the destination.  In SRv6
   TE, the IPv6 destination address in the outer IPv6 header could be
   the dedicated endpoint of the TE path rather than the destination of
   the TE path.  When the endpoint fails, local repair couldn't work on
   the direct neighbor of the failed endpoint either.  This document
   defines midpoint protection, which enables the direct neighbor of the
   failed endpoint to do the function of the endpoint, replace the IPv6
   destination address to the other endpoint, and choose the next hop
   based on the new destination address.

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

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   provisions of BCP 78 and BCP 79.

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Chen, et al.            Expires December 4, 2020                [Page 1]
Internet-Draftdraft-chen-rtgwg-srv6-midpoint-protection-02     June 2020

   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on December 4, 2020.

Copyright Notice

   Copyright (c) 2020 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.  SRv6 Midpoint Protection Mechanism  . . . . . . . . . . . . .   3
   3.  SRv6 Midpoint Protection Example  . . . . . . . . . . . . . .   3
   4.  SRv6 Midpoint Protection Behavior . . . . . . . . . . . . . .   5
     4.1.  Transit Node as Repair Node . . . . . . . . . . . . . . .   5
     4.2.  Endpoint Node as Repair Node  . . . . . . . . . . . . . .   5
     4.3.  Endpoint x Node as Repair Node  . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  An Appendix  . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The previous work in IETF has provided some mechanism, e.g., TI-
   LFA([I-D.ietf-rtgwg-segment-routing-ti-lfa]), that allows local
   repair actions on the direct neighbors of the failed node to
   temporarily route traffic to the destination.  These mechanism could
   not work properly when the failure happens in the destination point
   or the link connected to the destination.  In SRv6 TE, the IPv6
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