Updated Processing of Control Flags for BGP Virtual Private LAN Service (VPLS)
RFC 8614

Document Type RFC - Proposed Standard (June 2019; No errata)
Updates RFC 4761
Last updated 2019-06-18
Replaces draft-singh-bess-bgp-vpls-control-flags
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Mach Chen
Shepherd write-up Show (last changed 2019-01-29)
IESG IESG state RFC 8614 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Martin Vigoureux
Send notices to Mach Chen <mach.chen@huawei.com>
IANA IANA review state IANA OK - No Actions Needed
IANA action state No IANA Actions
Internet Engineering Task Force (IETF)                          R. Singh
Request for Comments: 8614                                   K. Kompella
Updates: 4761                                           Juniper Networks
Category: Standards Track                                S. Palislamovic
ISSN: 2070-1721                                                    Nokia
                                                               June 2019

                Updated Processing of Control Flags for
                 BGP Virtual Private LAN Service (VPLS)

Abstract

   This document updates the meaning of the Control Flags field in the
   "Layer2 Info Extended Community" used for BGP Virtual Private LAN
   Service (VPLS) Network Layer Reachability Information (NLRI) as
   defined in RFC 4761.  This document updates RFC 4761.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8614.

Copyright Notice

   Copyright (c) 2019 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
   (https://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
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Singh, et al.                Standards Track                    [Page 1]
RFC 8614               Control Flags for BGP VPLS              June 2019

Table of Contents

   1. Introduction ....................................................2
      1.1. Terminology ................................................3
   2. Problem Description .............................................3
   3. Updated Meaning of Control Flags in the Layer2 Info Extended
      Community .......................................................3
      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-Bits and S-Bits in Multihoming 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 .....................................9
   Authors' Addresses .................................................9

1.  Introduction

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

   The use of the CW helps prevent the misordering of IPv4 or IPv6
   Pseudowire (PW) traffic over Equal-Cost Multipath (ECMP) paths or
   Link Aggregation Group (LAG) bundles.  [RFC4385] describes the format
   for the CW that may be used over point-to-point PWs and over a VPLS.
   Along with [RFC3985], [RFC4385] also describes sequence number usage
   for VPLS frames.

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

Singh, et al.                Standards Track                    [Page 2]
RFC 8614               Control Flags for BGP VPLS              June 2019

1.1.  Terminology

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