EVPN Egress Protection
draft-wang-bess-evpn-egress-protection-00

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Last updated 2020-04-19
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BESS WG                                                      Yubao. Wang
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                          April 20, 2020
Expires: October 22, 2020

                         EVPN Egress Protection
               draft-wang-bess-evpn-egress-protection-00

Abstract

   A fast reroute framework for egress node protection is specified by
   [RFC8679] . But it cannot be applied to VXLAN EVPN directly.  This
   document specifies a mechanism to apply Egress Node Protection to
   VXLAN EVPN nodes and apply Egress Link Protection to EVPN EAD/EVI
   routes.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on October 22, 2020.

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   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
     1.1.  Terminology and Acronyms  . . . . . . . . . . . . . . . .   2
   2.  Detailed Problem and Solution Requirement . . . . . . . . . .   4
   3.  Encoding the Originating Router Address . . . . . . . . . . .   6
   4.  Control Plane Processing  . . . . . . . . . . . . . . . . . .   6
   5.  Protection Procedures . . . . . . . . . . . . . . . . . . . .   7
     5.1.  EVPN Egress Node Protection (EENP)  . . . . . . . . . . .   7
       5.1.1.  BUM Forwarding Protection . . . . . . . . . . . . . .   7
       5.1.2.  Unicast Forwarding Protection . . . . . . . . . . . .   7
     5.2.  Egress ESI Link Protection (EELP) . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   A principal feature of EVPN is the ability to support multi-homing
   from a customer equipment (CE) to multiple PE/VTEP with Ethernet
   segment (ES) links.  This draft specifies a VXLAN gateway mechanism
   to simplify VTEP processing in the dual-homed case and enhance EVPN
   convergency on egress failures.

1.1.  Terminology and Acronyms

   This document uses the following acronyms and terms:

   All-Active Redundancy Mode - When a device is multihomed to a group
   of two or more PEs and when all PEs in such redundancy group can
   forward traffic to/from the multihomed device or network for a given
   VLAN.

   Backup egress router - Given an egress-protected tunnel and its
   egress router, this is another router that has connectivity with all
   or a subset of the destinations of the egress-protected services
   carried by the egress-protected tunnel.

   BUM - Broadcast, Unknown unicast, and Multicast.

   CE - Customer Edge equipment.

   DCI - Data Center Interconnect.

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   EELP bypass tunnel - Egress ESI Link Protection bypass tunnel - A
   tunnel used to reroute service packets upon an egress ESI link
   failure.

   Egress failure - An egress node failure or an egress link failure.

   Egress link failure - A failure of the egress link (e.g., PE-CE link,
   attachment circuit) of a service.

   Egress loopback - the loopback interface on the Egress router, whose
   IP address is the destination of the Egress-protected tunnel.

   Egress node failure - A failure of an egress router.
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