EVPN Layer 2 Attributes Extended Community Usage in EVPN
draft-yu-bess-evpn-l2-attributes-01

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BESS Workgroup                                                     T. Yu
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                        December 5, 2018
Expires: June 8, 2019

        EVPN Layer 2 Attributes Extended Community Usage in EVPN
                  draft-yu-bess-evpn-l2-attributes-01

Abstract

   This document aims to define a negotiation mechanism for L2
   capabilities in an EVPN scenario.

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
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   This Internet-Draft will expire on June 8, 2019.

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   document authors.  All rights reserved.

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Yu                        Expires June 8, 2019                  [Page 1]
Internet-Draft         L2 Attributes in EVPN ELAN          December 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Specification of Requirements . . . . . . . . . . . . . . . .   2
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   4.  EVPN Layer 2 Attributes Extended Community  . . . . . . . . .   3
   5.  Usage of Control Flags  . . . . . . . . . . . . . . . . . . .   4
   6.  L2 MTU Processing . . . . . . . . . . . . . . . . . . . . . .   7
   7.  Instructions of using control word and Flow Label . . . . . .   7
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   10. Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   EVPN [RFC7432] is lacking a negotiation mechanism on L2 capabilities.
   If the L2 capabilities between PE devices are different, they are not
   able to communicate properly.

   This document aims to define a negotiation mechanism for L2
   capabilities in an EVPN scenario.

2.  Specification of Requirements

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
   NOT","SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in
   this document are to be interpreted as described in [RFC2119].

3.  Terminology

   EVPN: BGP MPLS-Based Ethernet VPN defined in [RFC7432]

   EVPN ELAN: In order to distinguish EVPN VPWS, EVPN ELAN speficies
   EVPN defined in [RFC7432]

   CW: Control Word defined in [RFC4448]

   CI: Control word indicator, defined in Section 4 of this document

   PE: Provider Edge

   FL: Flow label, defined in [RFC6391]

Yu                        Expires June 8, 2019                  [Page 2]
Internet-Draft         L2 Attributes in EVPN ELAN          December 2018

4.  EVPN Layer 2 Attributes Extended Community

   EVPN Layer 2 Attributes Extended Community is defined in EVPN VPWS
   [RFC8214].  This document describes the behaviors how it adapts to
   EVPN ELAN.  A mechanism to achieve interoperability between devices
   with and without CW capabilities is defined.  Flow Label mechanism is
   defined.  EVPN Layer 2 Attributes Extended Community is advertised
   along with Ethernet Auto-discovery.  The definition of EVPN Layer 2
   Attributes Extended Community is same with [RFC8214]. it is listed as
   below for convenience.

               +-------------------------------------------+
               |  Type (0x06) / Sub-type (0x04) (2 octets) |
               +-------------------------------------------+
               |  Control Flags  (2 octets)                |
               +-------------------------------------------+
               |  L2 MTU (2 octets)                        |
               +-------------------------------------------+
               |  Reserved (2 octets)                      |
               +-------------------------------------------+
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