Enhance IPv6-Segment-Routing-based EVPN VPWS All Active Usage
draft-hu-bess-srv6-vpn-bypass-sid-00

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Last updated 2018-07-02
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Network Working Group                                              C. Hu
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                           July 02, 2018
Expires: January 3, 2019

     Enhance IPv6-Segment-Routing-based EVPN VPWS All Active Usage
                  draft-hu-bess-srv6-vpn-bypass-sid-00

Abstract

   This document describes the extensions to enhance SRv6 EVPN VPWS all-
   active Reliability.

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 3, 2019.

Copyright Notice

   Copyright (c) 2018 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
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

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Internet-Draft   Enhance SRv6 EVPN VPWS All Active Usage       July 2018

   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 VPN Bypass SID Attribute . . . . . . . . . . . . . . . .   3
     2.1.  End.DX2L: Endpoint with decapsulation and Layer-2 cross-
           connect to local access . . . . . . . . . . . . . . . . .   4
     2.2.  End.DT2UL: Endpoint with decapsulation and unicast Local
           MAC L2 table lookup . . . . . . . . . . . . . . . . . . .   5
   3.  Control Plane Processing  . . . . . . . . . . . . . . . . . .   6
   4.  Data Packets Processing . . . . . . . . . . . . . . . . . . .   7
   5.  EVPN Multipoint to Multipoint (MP2MP) services  . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

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 a sub type of the SRv6
   VPN SID attribute [draft-dawra-idr-srv6-vpn], to be included with
   per-EVI Ethernet A-D routes.

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                                      +-----+
                                      | CE2 |
                                      +-----+
                                         |
                                      +-----+
                                      |EVPL1| Local/Remote Ethernet Tag ID->100/200
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