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LDP Extensions for Optimized MAC Address Withdrawal in a Hierarchical Virtual Private LAN Service (H-VPLS)
RFC 7361

Internet Engineering Task Force (IETF)                          P. Dutta
Request for Comments: 7361                                      F. Balus
Category: Standards Track                                 Alcatel-Lucent
ISSN: 2070-1721                                                O. Stokes
                                                        Extreme Networks
                                                            G. Calvignac
                                                                  Orange
                                                                D. Fedyk
                                                         Hewlett-Packard
                                                          September 2014

          LDP Extensions for Optimized MAC Address Withdrawal
         in a Hierarchical Virtual Private LAN Service (H-VPLS)

Abstract

   RFC 4762 describes a mechanism to remove or unlearn Media Access
   Control (MAC) addresses that have been dynamically learned in a
   Virtual Private LAN Service (VPLS) instance for faster convergence on
   topology changes.  The procedure also removes MAC addresses in the
   VPLS that do not require relearning due to such topology changes.
   This document defines an enhancement to the MAC address withdraw
   procedure with an empty MAC list (RFC 4762); this enhancement enables
   a Provider Edge (PE) device to remove only the MAC addresses that
   need to be relearned.  Additional extensions to RFC 4762 MAC withdraw
   procedures are specified to provide an optimized MAC flushing for the
   Provider Backbone Bridging (PBB) VPLS specified in RFC 7041.

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/rfc7361.

Dutta, et al.                Standards Track                    [Page 1]
RFC 7361           Optimized MAC Withdrawal in H-VPLS     September 2014

Copyright Notice

   Copyright (c) 2014 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.

Dutta, et al.                Standards Track                    [Page 2]
RFC 7361           Optimized MAC Withdrawal in H-VPLS     September 2014

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................6
      2.1. Requirements Language ......................................6
   3. Overview ........................................................6
      3.1. MAC Flushing on Activation of Backup Spoke PW ..............8
           3.1.1. MAC Flushing Initiated by PE-rs .....................8
           3.1.2. MAC Flushing Initiated by MTU-s .....................8
      3.2. MAC Flushing on Failure ....................................9
      3.3. MAC Flushing in PBB-VPLS ..................................10
   4. Problem Description ............................................10
      4.1. MAC Flushing Optimization in VPLS Resiliency ..............10
           4.1.1. MAC Flushing Optimization for Regular H-VPLS .......11
           4.1.2. MAC Flushing Optimization for Native Ethernet
                  Access .............................................13
      4.2. Black-Holing Issue in PBB-VPLS ............................13
   5. Solution Description ...........................................14
      5.1. MAC Flushing Optimization for VPLS Resiliency .............14
           5.1.1. MAC Flush Parameters TLV ...........................15
           5.1.2. Application of the MAC Flush TLV in
                  Optimized MAC Flushing .............................16
           5.1.3. MAC Flush TLV Processing Rules for Regular VPLS ....17
           5.1.4. Optimized MAC Flush Procedures .....................18

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