BGP based Multi-homing in Virtual Private LAN Service
draft-ietf-l2vpn-vpls-multihoming-05

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Document Type Active Internet-Draft (l2vpn WG)
Last updated 2013-02-25
Replaces draft-kothari-henderickx-l2vpn-vpls-multihoming
Replaced by draft-ietf-bess-vpls-multihoming
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Network Working Group                                         B. Kothari
Internet-Draft                                           Cohere Networks
Updates: 4761 (if approved)                                  K. Kompella
Intended status: Standards Track                        Juniper Networks
Expires: August 29, 2013                                   W. Henderickx
                                                                F. Balus
                                                          Alcatel-Lucent
                                                               J. Uttaro
                                                                    AT&T
                                                         S. Palislamovic
                                                          Alcatel-Lucent
                                                                  W. Lin
                                                        Juniper Networks
                                                       February 25, 2013

         BGP based Multi-homing in Virtual Private LAN Service
                draft-ietf-l2vpn-vpls-multihoming-05.txt

Abstract

   Virtual Private LAN Service (VPLS) is a Layer 2 Virtual Private
   Network (VPN) that gives its customers the appearance that their
   sites are connected via a Local Area Network (LAN).  It is often
   required for the Service Provider (SP) to give the customer redundant
   connectivity to some sites, often called "multi-homing".  This memo
   shows how BGP-based multi-homing can be offered in the context of LDP
   and BGP VPLS solutions.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 29, 2013.

Copyright Notice

Kothari, et al.          Expires August 29, 2013                [Page 1]
Internet-Draft              VPLS Multi-homing              February 2013

   Copyright (c) 2013 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
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Kothari, et al.          Expires August 29, 2013                [Page 2]
Internet-Draft              VPLS Multi-homing              February 2013

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  General Terminology  . . . . . . . . . . . . . . . . . . .  4
     1.2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . .  5
   2.  Background . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     2.1.  Scenarios  . . . . . . . . . . . . . . . . . . . . . . . .  6
     2.2.  VPLS Multi-homing Considerations . . . . . . . . . . . . .  7
   3.  Multi-homing Operation . . . . . . . . . . . . . . . . . . . .  8
     3.1.  Multi-homing NLRI  . . . . . . . . . . . . . . . . . . . .  8
     3.2.  Provisioning Model . . . . . . . . . . . . . . . . . . . .  9
     3.3.  Designated Forwarder Election  . . . . . . . . . . . . . . 10
       3.3.1.  Attributes . . . . . . . . . . . . . . . . . . . . . . 10
       3.3.2.  Variables Used . . . . . . . . . . . . . . . . . . . . 11
       3.3.3.  Election Procedures  . . . . . . . . . . . . . . . . . 12
     3.4.  DF Election on PEs . . . . . . . . . . . . . . . . . . . . 14
   4.  Multi-AS VPLS  . . . . . . . . . . . . . . . . . . . . . . . . 15
     4.1.  Route Origin Extended Community  . . . . . . . . . . . . . 15
     4.2.  VPLS Preference  . . . . . . . . . . . . . . . . . . . . . 15
     4.3.  Use of BGP-MH attributes in Inter-AS Methods . . . . . . . 16
       4.3.1.  Inter-AS Method (b): EBGP Redistribution of VPLS
               Information between ASBRs  . . . . . . . . . . . . . . 16
       4.3.2.  Inter-AS Method (c): Multi-Hop EBGP Redistribution
               of VPLS Information between ASes . . . . . . . . . . . 17
   5.  MAC Flush Operations . . . . . . . . . . . . . . . . . . . . . 19
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