Usage of Layer 2 Attributes Extended Community in EVPN
draft-yu-bess-evpn-l2-attributes-05

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BESS Workgroup                                                T. Yu, Ed.
Internet-Draft
Updates: RFC7432, RFC8214 (if approved)                          H. Wang
Intended status: Standards Track                     Huawei Technologies
Expires: October 5, 2019                                   April 3, 2019

         Usage of Layer 2 Attributes Extended Community in EVPN
                  draft-yu-bess-evpn-l2-attributes-05

Abstract

   This document adopts Layer 2 Attributes Extended Community defined in
   [RFC8214] to EVPN allowing negotiate Layer2 information in the
   control plane.

   An interoperability mechanism between PEs with and without control
   word capability is described for EVPN and VPWS in this document.

   Flow label signaling mechanism is also described for EVPN ELAN and
   VPWS with interoperability capability considered.

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Yu & Wang                Expires October 5, 2019                [Page 1]
Internet-Draft       Usage of L2 Attributes in EVPN           April 2019

   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Specification of Requirements . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  EVPN Layer 2 Attributes Extended Community  . . . . . . . . .   4
     4.1.  Control Flag Attribute  . . . . . . . . . . . . . . . . .   6
     4.2.  L2 MTU Attribute  . . . . . . . . . . . . . . . . . . . .   7
   5.  Control Word Indicator Extended Community . . . . . . . . . .   7
   6.  Usage of Control Word . . . . . . . . . . . . . . . . . . . .   8
     6.1.  EVPN ELAN . . . . . . . . . . . . . . . . . . . . . . . .   8
       6.1.1.  Deterministic mode  . . . . . . . . . . . . . . . . .   8
       6.1.2.  Interoperable mode  . . . . . . . . . . . . . . . . .   9
     6.2.  EVPN VPWS . . . . . . . . . . . . . . . . . . . . . . . .   9
       6.2.1.  Deterministic mode  . . . . . . . . . . . . . . . . .   9
       6.2.2.  Interoperable mode  . . . . . . . . . . . . . . . . .   9
   7.  Usage of Flow Label . . . . . . . . . . . . . . . . . . . . .  10
   8.  Instructions on Using Control Word and Flow Label . . . . . .  10
   9.  Other Considerations  . . . . . . . . . . . . . . . . . . . .  11
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   12. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     13.2.  Informative References . . . . . . . . . . . . . . . . .  12
   Appendix A.  Example of using Layer 2 Attributes Extended
                Community  . . . . . . . . . . . . . . . . . . . . .  13
     A.1.  Example 1: ELAN Control Word Deterministic mode . . . . .  13
     A.2.  Example 2: ELAN Control Word Interoperable mode . . . . .  13
     A.3.  Example 3: Usage of Flow Label  . . . . . . . . . . . . .  14
     A.4.  Example 4: Combination of Control Word and Flow Label . .  14
     A.5.  Example 5: Combination of CW Interoperable mode and FL  .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   EVPN [RFC7432] lacks a negotiation mechanism on L2 capabilities.
   Lacking such capabilities will lead to malformed packets on
   forwarding plane without any prevention from the control plane
   signaling.  Issues caused due to mismatch of Layer 2 capabilities are
   listed below:
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