Media Access Control (MAC) Address Withdrawal over Static Pseudowire
RFC 7769

Document Type RFC - Proposed Standard (February 2016; No errata)
Last updated 2016-02-25
Replaces draft-ietf-l2vpn-mpls-tp-mac-wd
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Andrew Malis
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IESG IESG state RFC 7769 (Proposed Standard)
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Responsible AD Deborah Brungard
Send notices to draft-ietf-pals-mpls-tp-mac-wd.all@ietf.org
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                      S. Sivabalan
Request for Comments: 7769                                    S. Boutros
Category: Standards Track                            Cisco Systems, Inc.
ISSN: 2070-1721                                                  H. Shah
                                                             Ciena Corp.
                                                               S. Aldrin
                                                             Google Inc.
                                                           M. Venkatesan
                                                                 Comcast
                                                           February 2016

  Media Access Control (MAC) Address Withdrawal over Static Pseudowire

Abstract

   This document specifies a mechanism to signal Media Access Control
   (MAC) address withdrawal notification using a pseudowire (PW)
   Associated Channel (ACH).  Such notification is useful when
   statically provisioned PWs are deployed in a Virtual Private LAN
   Service (VPLS) or Hierarchical Virtual Private LAN Service (H-VPLS)
   environment.

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 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7769.

Sivabalan, et al.            Standards Track                    [Page 1]
RFC 7769          MAC Address Withdrawal over Static PW    February 2016

Copyright Notice

   Copyright (c) 2016 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
   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  MAC Withdraw OAM Message  . . . . . . . . . . . . . . . . . .   4
   4.  Operation . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Operation of Sender . . . . . . . . . . . . . . . . . . .   6
     4.2.  Operation of Receiver . . . . . . . . . . . . . . . . . .   7
   5.  Security Consideration  . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  MPLS G-Ach Type . . . . . . . . . . . . . . . . . . . . .   8
     6.2.  Sequence Number TLV . . . . . . . . . . . . . . . . . . .   8
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

Sivabalan, et al.            Standards Track                    [Page 2]
RFC 7769          MAC Address Withdrawal over Static PW    February 2016

1.  Introduction

   An LDP-based MAC address withdrawal mechanism is specified in
   [RFC4762] to remove dynamically learned MAC addresses when the source
   of those addresses can no longer forward traffic.  This is
   accomplished by sending an LDP Address Withdraw Message with a MAC
   List TLV containing the MAC addresses to be removed from all other
   Provider Edge nodes over the LDP sessions.  [RFC7361] describes an
   optimized MAC withdrawal mechanism that can be used to remove only
   the set of MAC addresses that need to be relearned in H-VPLS
   networks.  [RFC7361] also describes optimized MAC withdrawal
   operations in PBB-VPLS networks.

   A PW can be signaled via the LDP or can be statically provisioned.
   In the case of a static PW, an LDP-based MAC withdrawal mechanism
   cannot be used.  This is analogous to the problem and solution
   described in [RFC6478] where a PW OAM (Operations, Administration,
   and Maintenance) message has been introduced to carry the PW status
   TLV using the in-band PW Associated Channel.  In this document, we
   use a PW OAM message to withdraw MAC address(es) learned via a static
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