EVPN Multi-Homing Extensions for Split Horizon Filtering
draft-nr-bess-evpn-mh-split-horizon-03

Document Type Active Internet-Draft (individual)
Last updated 2020-09-09
Stream (None)
Intended RFC status (None)
Formats plain text pdf htmlized (tools) htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
BESS Workgroup                                           J. Rabadan, Ed.
Internet-Draft                                                K. Nagaraj
Intended status: Standards Track                                   Nokia
Expires: March 13, 2021                                           W. Lin
                                                                 Juniper
                                                              A. Sajassi
                                                                   Cisco
                                                       September 9, 2020

        EVPN Multi-Homing Extensions for Split Horizon Filtering
                 draft-nr-bess-evpn-mh-split-horizon-03

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, GENEVE or
   SRv6.  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).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   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 March 13, 2021.

Rabadan, et al.          Expires March 13, 2021                 [Page 1]
Internet-Draft      EVPN MH Split Horizon Extensions      September 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
   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
   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
     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
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . .  14
   Appendix B.  Contributors . . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

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
   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 [RFC7510], and its procedures described in [RFC7432].
Show full document text