Updated processing of Control Flags for BGP VPLS
draft-ietf-bess-bgp-vpls-control-flags-08

Document Type Active Internet-Draft (bess WG)
Last updated 2019-04-24 (latest revision 2019-04-19)
Replaces draft-singh-bess-bgp-vpls-control-flags
Stream IETF
Intended RFC status Proposed Standard
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BESS Working Group                                              R. Singh
INTERNET-DRAFT                                               K. Kompella
Intended Status: Proposed Standard                      Juniper Networks
Updates: 4761 (if approved)                              S. Palislamovic
                                                                   Nokia
Expires: October 20, 2019                                 April 18, 2019

           Updated processing of Control Flags for BGP VPLS 
               draft-ietf-bess-bgp-vpls-control-flags-08

Abstract

   This document updates the meaning of the Control Flags field in the
   Layer2 Info Extended Community used for BGP-VPLS NLRI as defined in
   RFC4761. This document updates RFC4761.

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) 2018 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
 

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INTERNET DRAFT         Control Flags for BGP VPLS         April 18, 2019

   (http://trustee.ietf.org/license-info) in effect on the date of
   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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   described in the Simplified BSD License.

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 Point-to-MultiPoint (P2MP) LSPs as transport for BGP 
      VPLS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   5  Illustrative diagram  . . . . . . . . . . . . . . . . . . . . .  6
   6  Treatment of C and S bits in multi-homing scenarios . . . . . .  7
     6.1 Control word (C-bit) . . . . . . . . . . . . . . . . . . . .  7
     6.2 Sequence flag (S-bit)  . . . . . . . . . . . . . . . . . . .  7
   7  Security Considerations . . . . . . . . . . . . . . . . . . . .  8
   8  IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  8
   9  References  . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     9.1  Normative References  . . . . . . . . . . . . . . . . . . .  8
     9.2 Informative References . . . . . . . . . . . . . . . . . . .  8
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  9

 

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1  Introduction

   "Virtual Private LAN Service (VPLS) Using BGP for Auto-Discovery and
   Signaling" ([RFC4761]) describes the concepts and signaling for using
   Border Gateway Protocol (BGP) to setup a VPLS. It specifies the BGP
   VPLS Network Layer Reachability Information (NLRI) by which a
   provider-edge router (PE) may require other PEs in the same VPLS to
   include (or not) the control-word and sequencing information in VPLS
   frames sent to this PE.

   The use of the Control Word (CW) helps prevent mis-ordering of IPv4
   or IPv6 Pseudo-Wire (PW) traffic over Equal Cost Multi-Path (ECMP)
   paths or Link Aggregation Group (LAG) bundles. [RFC4385] describes
   the format for CW that may be used over Point-to-Point PWs and over a
   VPLS. Along with [RFC3985], the document also describes sequence
   number usage for VPLS frames.

   However, [RFC4761] does not specify the behavior of PEs in a mixed
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