Updated processing of control flags for BGP VPLS
draft-ietf-bess-bgp-vpls-control-flags-02

Document Type Active Internet-Draft (bess WG)
Last updated 2017-01-09
Replaces draft-singh-bess-bgp-vpls-control-flags
Stream IETF
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BESS Working Group                                              R. Singh
INTERNET-DRAFT                                               K. Kompella
Intended Status: Proposed Standard                      Juniper Networks
                                                         S. Palislamovic
                                                          Alcatel-Lucent
Expires: July 13, 2017                                   January 9, 2017

           Updated processing of control flags for BGP VPLS 
               draft-ietf-bess-bgp-vpls-control-flags-02

Abstract

   This document updates the meaning of the "control flags" fields
   inside the "layer2 info extended community" used for BGP-VPLS NLRI.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

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Copyright and License Notice

   Copyright (c) 2013 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
 

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   publication of this document. Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document. Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  3
   2  Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3  Updated meaning of control flags in the layer2 info extended 
      community . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     3.1 Control word (C-bit) . . . . . . . . . . . . . . . . . . . .  4
     3.2 Sequence flag (S-bit)  . . . . . . . . . . . . . . . . . . .  4
   4  Using p2mp LSP as transport for BGP VPLS  . . . . . . . . . . .  5
   5.  Treatment of C and S bits in multi-homing scenarios  . . . . .  5
     5.1 Control word (C-bit) . . . . . . . . . . . . . . . . . . . .  5
     5.2 Sequence flag (S-bit)  . . . . . . . . . . . . . . . . . . .  6
   6  Illustrative diagram  . . . . . . . . . . . . . . . . . . . . .  6
   7  Security Considerations . . . . . . . . . . . . . . . . . . . .  7
   8  IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  7
   9  References  . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     9.1  Normative References  . . . . . . . . . . . . . . . . . . .  7
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  8

 

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1  Introduction

   [RFC4761] describes the concepts and signaling for using BGP to setup
   a VPLS. It specifies the BGP VPLS NLRI that a PE may require other
   PEs in the same VPLS to include (or not) control-word and sequencing
   information in VPLS frames sent to this PE.

   The use of control word (CW) helps prevent mis-ordering of IPv4 or
   IPv6 PW traffic over ECMP-paths/LAG-bundles. [RFC4385] describes the
   format for control-word that may be used over point-2-point PWs and
   over a VPLS. It along with [RFC3985] also describes sequencing of
   frames.

   However, [RFC4761] does not specify the behavior of PEs in a mixed
   environment where some PEs support control-word/sequencing and others
   do not.

1.1  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
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