EVPN Multi-Homing Mechanism for Layer-2 Gateway Protocols
draft-brissette-bess-evpn-l2gw-proto-03

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Last updated 2018-10-22
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INTERNET-DRAFT                                         Patrice Brissette
Intended Status: Proposed Standard                           Ali Sajassi
                                                        Luc Andre Burdet
                                                           Cisco Systems
                                                                        
                                                            Daniel Voyer
                                                             Bell Canada
                                                                        
Expires: April 23, 2019                                 October 20, 2018

       EVPN Multi-Homing Mechanism for Layer-2 Gateway Protocols
                draft-brissette-bess-evpn-l2gw-proto-03

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 April 23, 2019                 [Page 1]
INTERNET DRAFT    draft-brissette-bess-evpn-l2gw-proto  October 20, 2018

   Copyright (c) 2018 IETF Trust and the persons identified as the
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Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Solution . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3. Requirements  . . . . . . . . . . . . . . . . . . . . . . . . .  6
   4. Handling of Topology Change Notification (TCN)  . . . . . . . .  7
   5. ESI-label Extended Community Extension  . . . . . . . . . . . .  8
   6. EVPN MAC Flush Extcomm  . . . . . . . . . . . . . . . . . . . .  8
   7. EVPN Inter-subnet Forwarding  . . . . . . . . . . . . . . . . .  9
   8. Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . . .  9
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   10.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . 10
   11.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
   12.  References  . . . . . . . . . . . . . . . . . . . . . . . . . 10
     12.1  Normative References . . . . . . . . . . . . . . . . . . . 10
     12.2  Informative References . . . . . . . . . . . . . . . . . . 10

 

Patrice Brissette        Expires April 23, 2019                 [Page 2]
INTERNET DRAFT    draft-brissette-bess-evpn-l2gw-proto  October 20, 2018

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
   multi-homing PEs and it is also in contrast with All-Active
   redundancy mode where all L2 flows of a VLAN are active on all PEs in
   the redundancy group.

   This draft defines a new multi-homing mechanism "Single-Flow-Active"
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