EVPN Multi-Homing Mechanism for Layer-2 Gateway Protocols
draft-brissette-bess-evpn-l2gw-proto-04

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INTERNET-DRAFT                                         Patrice Brissette
Intended Status: Proposed Standard                           Ali Sajassi
                                                        Luc Andre Burdet
                                                           Cisco Systems
                                                                        
                                                            Daniel Voyer
                                                             Bell Canada
                                                                        
Expires: September 12, 2019                               March 11, 2019

       EVPN Multi-Homing Mechanism for Layer-2 Gateway Protocols
                draft-brissette-bess-evpn-l2gw-proto-04

Abstract

   The existing EVPN multi-homing load-balancing modes defined are
   Single-Active and All-Active. Neither of these multi-homing
   mechanisms are appropriate to support access networks with Layer-2
   Gateway protocols such as G.8032, MPLS-TP, STP, etc. These Layer-2
   Gateway protocols require a new multi-homing mechanism defined in
   this draft.

Status of this Memo

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Copyright and License Notice

 

Patrice Brissette      Expires September 12, 2019               [Page 1]
INTERNET DRAFT    draft-brissette-bess-evpn-l2gw-proto    March 11, 2019

   Copyright (c) 2019 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  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Solution . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     2.1 The two-ESI solution . . . . . . . . . . . . . . . . . . . .  5
     2.2 Single-Flow-Active redundancy mode . . . . . . . . . . . . .  6
     2.3 Backwards compatibility  . . . . . . . . . . . . . . . . . .  6
   3. Requirements  . . . . . . . . . . . . . . . . . . . . . . . . .  7
   4. Handling of Topology Change Notification (TCN)  . . . . . . . .  8
   5. ESI-label Extended Community Extension  . . . . . . . . . . . .  9
   6. EVPN MAC-Flush Extended Community . . . . . . . . . . . . . . .  9
   7. EVPN Inter-subnet Forwarding  . . . . . . . . . . . . . . . . . 10
   8. Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . . . 10
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   10.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . 11
   11.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
   12.  References  . . . . . . . . . . . . . . . . . . . . . . . . . 11
     12.1  Normative References . . . . . . . . . . . . . . . . . . . 11
     12.2  Informative References . . . . . . . . . . . . . . . . . . 11

 

Patrice Brissette      Expires September 12, 2019               [Page 2]
INTERNET DRAFT    draft-brissette-bess-evpn-l2gw-proto    March 11, 2019

1. Introduction

   Existing EVPN multi-homing mechanisms of Single-Active and All-Active
   are not sufficient to support access Layer-2 Gateway protocols such
   as G.8032, MPLS-TP, STP, etc. 

   These Layer-2 Gateway protocols require that a given flow of a VLAN
   (represented by {MAC-SA, MAC-DA}) to be only active on one of the PEs
   in the multi-homing group. This is in contrast with Single-Active
   redundancy mode where all flows of a VLAN are active on one of the
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