EVPN Multi-Homing Extensions for Split Horizon Filtering
draft-nr-bess-evpn-mh-split-horizon-01

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Last updated 2019-09-16
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BESS Workgroup                                           J. Rabadan, Ed.
Internet Draft                                                K. Nagaraj
Intended status: Standards Track                                   Nokia

                                                                  W. Lin
                                                                 Juniper

                                                              A. Sajassi
                                                                   Cisco

Expires: March 19, 2020                               September 16, 2019

        EVPN Multi-Homing Extensions for Split Horizon Filtering
                 draft-nr-bess-evpn-mh-split-horizon-01

Abstract

   Ethernet Virtual Private Network (EVPN) is commonly used along with
   Network Virtualization Overlay (NVO) tunnels. The EVPN multi-homing
   procedures may be different depending on the NVO tunnel type used in
   the EVPN Broadcast Domain. In particular, there are two multi-homing
   Split Horizon procedures to avoid looped frames on the multi-homed
   CE: ESI Label based and Local Bias. ESI Label based Split Horizon is
   used for MPLSoX tunnels, E.g., MPLSoUDP, whereas Local Bias is used
   for others, E.g., VXLAN tunnels. The current specifications do not
   allow the operator to decide which Split Horizon procedure to use for
   tunnel encapsulations that could support both. Examples of tunnels
   that may support both procedures are MPLSoGRE, MPLSoUDP or GENEVE.
   This document extends the EVPN Multi-Homing procedures so that an
   operator can decide the Split Horizon procedure for a given NVO
   tunnel depending on their own requirements.

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), its areas, and its working groups.  Note that
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   Drafts.
 

Nagaraj, Rabadan et al   Expires March 19, 2020                 [Page 1]
Internet-Draft      EVPN MH Split Horizon Extensions  September 16, 2019

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

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Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1 Conventions and Terminology  . . . . . . . . . . . . . . . .  5
   2. BGP EVPN Extensions . . . . . . . . . . . . . . . . . . . . . .  7
     2.1 The Split Horizon Type (SHT) . . . . . . . . . . . . . . . .  7
     2.2 Use of the Split Horizon Type In A-D Per ES Routes . . . . .  8
     2.3 ESI Label Value In A-D Per ES Routes . . . . . . . . . . . .  9
     2.4 Backwards Compatibility With [RFC8365] NVEs  . . . . . . . . 10
   3. Procedures for NVEs Supporting Multiple Encapsulations  . . . . 10
   7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 12
   8. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     8.1. Normative References  . . . . . . . . . . . . . . . . . . . 12
     8.2. Informative References  . . . . . . . . . . . . . . . . . . 13
   9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 14
   10. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 14
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14

 

Nagaraj, Rabadan et al   Expires March 19, 2020                 [Page 2]
Internet-Draft      EVPN MH Split Horizon Extensions  September 16, 2019

1. Introduction

   Ethernet Virtual Private Network (EVPN) is commonly used along with
   Network Virtualization Overlay (NVO) tunnels and specified in
   [RFC8365]. The EVPN multi-homing procedures may be different
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