EVPN VPWS layer 2 Attributes Extended community for Control-Word behavior
draft-gs-bess-evpn-l2-attribute-cw-00

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Last updated 2018-12-24
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BESS Workgroup                                    Gangadhara Reddy Chavva
                                                                 Ericsson
                                                         Satishkumar Rodd
Internet-Draft                                                   Ericsson
Intended status: Standards Track                        
Expires: June 24, 2019                                  December 24, 2018

             EVPN VPWS layer 2 Attributes Extended community for 
                         Control-Word behavior 
                  draft-gs-bess-evpn-l2-attribute-cw-00

Abstract

   This document aims to define a negotiation mechanism for L2
   capabilities in an EVPN scenario spefic to EVPN-VPWS control word 
   behavior.

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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.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   EVPN [RFC7432] is ambiguous about the VPWS session  
   if the control-word(C-flag) in L2 attributes between PE devices are 
   different.

   The objective of this document is to explain the mechanism to  
   negaotiate C-flag between PE devices which helps establish EVPN-VPWS 
   session where PE C-flags don't align initially.
   
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]

   PE: Provider Edge

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4.  EVPN Layer 2 Attributes Extended Community

   EVPN Layer 2 Attributes Extended Community is defined in EVPN VPWS
   [RFC8214]. A mechanism to achieve interoperability between devices
   with different CW capabilities is defined in this document. 
   EVPN Layer 2 Attributes Extended Community is advertised
   along with Ethernet Auto-discovery(E-AD). 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)                        |
               +-------------------------------------------+
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