SRv6 SID Bypass Functions
draft-chen-bess-srv6-service-bypass-sid-00

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Last updated 2020-07-13
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Network Working Group                                            H. Chen
Internet-Draft                                             China Telecom
Intended status: Standards Track                                   Y. Gu
Expires: January 14, 2021                                        H. Wang
                                                                  Huawei
                                                           July 13, 2020

                       SRv6 SID Bypass Functions
               draft-chen-bess-srv6-service-bypass-sid-00

Abstract

   This document introduces the SRv6 SID Bypass Functions to enhance
   reliability and prevent traffic loop in fast reroute(FRR) scenario.

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 14, 2021.

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
   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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   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  SRv6 SID Bypass Functions . . . . . . . . . . . . . . . . . .   3
     2.1.  End.DX2L  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Control Plane Processing  . . . . . . . . . . . . . . . . . .   4
   4.  Data Plane Processing . . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   In SRv6 EVPN VPWS all-active scenario, a router or switch (CE1) is
   dual-homed to enterprise site (PE1 and PE2).  SRv6 EVPN VPWS service
   is run between enterprise sites (PE1, PE2, and CPE).  When one PE
   fails, services can be rapidly switched to the other PE, minimizing
   the impact on services.

   As shown in Figure 1, deploy fast reroute(FRR) service on PE1 and
   PE2.  When the AC(attachment circuit) link on PE1 fails, PE1 receives
   downlink traffic and can bypass it to the PE2 device for forwarding.
   PE2 is also the same.  If the AC side links on PE1 and PE2 fail
   together, a brief traffic loop between PE1 and PE2 occurs.  The
   traffic loop will waste the forwarding resources of the equipment and
   cause performance pressure.  The length of the traffic loop depends
   on the convergence of the control plane.  That is, PE1 withdraws the
   per-EVI Ethernet A-D route advertised to PE2.  The FRR backup path on
   PE2 is destroyed.  PE2 does not send traffic to PE1.  In order to
   solve the above problem, this document defines the SRv6 SID Bypass
   Functions that will be contained in the SRv6 SID Information Sub-TLV
   [I-D.ietf-bess-srv6-services], and to be advertised with per-EVI
   Ethernet A-D routes.

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