Updated processing of control flags for BGP VPLS
draft-ietf-bess-bgp-vpls-control-flags-06

Document Type Active Internet-Draft (bess WG)
Last updated 2018-11-15 (latest revision 2018-08-17)
Replaces draft-singh-bess-bgp-vpls-control-flags
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication
Document shepherd Mach Chen
Shepherd write-up Show (last changed 2018-11-15)
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Send notices to Mach Chen <mach.chen@huawei.com>
BESS Working Group                                              R. Singh
INTERNET-DRAFT                                               K. Kompella
Intended Status: Proposed Standard                      Juniper Networks
Updates: 4761 (if approved)                              S. Palislamovic
                                                          Alcatel-Lucent
Expires: February 18, 2019                               August 17, 2018

           Updated processing of control flags for BGP VPLS 
               draft-ietf-bess-bgp-vpls-control-flags-06

Abstract

   This document updates the meaning of the "control flags" fields
   inside the "layer2 info extended community" used for BGP-VPLS NLRI as
   defined in RFC4761. If approved, 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
 

Singh, et al           Expires February 18, 2019                [Page 1]
INTERNET DRAFT         Control Flags for BGP VPLS        August 17, 2018

   (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
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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 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
     9.2 Informative References . . . . . . . . . . . . . . . . . . .  7
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  8

 

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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
   BGP (Border Gateway Protocol) to setup a VPLS (virtual private LAN
   service). It specifies the BGP VPLS NLRI (network layer reachability
   information) by which 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 (equal cost multi-path) paths or LAG (link
   aggregation group) bundles. [RFC4385] describes the format for
   control-word that may be used over point-2-point PWs (pseudowires)
   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
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