Pseudowire Redundancy
draft-ietf-pwe3-redundancy-07

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Document Type Active Internet-Draft (pwe3 WG)
Last updated 2012-05-03 (latest revision 2012-04-23)
Replaces draft-muley-pwe3-redundancy
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Intended RFC status Informational
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Network Working Group                                           P. Muley
Internet-Draft                                               M. Aissaoui
Intended status: Informational                                  M. Bocci
Expires: October 25, 2012                                 Alcatel-Lucent
                                                          April 23, 2012

                         Pseudowire Redundancy
                     draft-ietf-pwe3-redundancy-07

Abstract

   This document describes a framework comprised of a number of
   scenarios and associated requirements for pseudowire (PW) redundancy.
   A set of redundant PWs is configured between provider edge (PE) nodes
   in single segment PW applications, or between Terminating PE nodes in
   Multi-Segment PW applications.  In order for the PE/T-PE nodes to
   indicate the preferred PW to use for forwarding PW packets to one
   another, a new PW status is required to indicate the preferential
   forwarding status of active or standby for each PW in the redundancy
   set.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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
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   This Internet-Draft will expire on October 25, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the

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   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
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Reference Models . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.  PE Architecture  . . . . . . . . . . . . . . . . . . . . .  5
     3.2.  PW Redundancy Network Reference Scenarios  . . . . . . . .  5
       3.2.1.  Single Multi-Homed CE  . . . . . . . . . . . . . . . .  5
       3.2.2.  Multiple Multi-Homed CEs . . . . . . . . . . . . . . .  7
       3.2.3.  Single-Homed CE With MS-PW Redundancy  . . . . . . . .  8
       3.2.4.  PW Redundancy Between MTU-s in H-VPLS  . . . . . . . .  9
       3.2.5.  PW Redundancy Between VPLS Network Facing PEs
               (n-PEs)  . . . . . . . . . . . . . . . . . . . . . . . 11
       3.2.6.  Redundancy in a VPLS Bridge Module Model . . . . . . . 12
   4.  Generic PW Redundancy Requirements . . . . . . . . . . . . . . 13
     4.1.  Protection Switching Requirements  . . . . . . . . . . . . 13
     4.2.  Operational Requirements . . . . . . . . . . . . . . . . . 13
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 14
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 14
   7.  Major Contributing Authors . . . . . . . . . . . . . . . . . . 14
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 15
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 15
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 16
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16

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1.  Introduction

   The objective of PW redundancy is to provide sparing of attachment
   circuits (ACs), Provider Edge nodes (PEs), and Pseudowires (PWs) to
   eliminate single points of failure, while ensuring that only one
   active path between a pair of Customer Edge nodes (CEs).

   In single-segment PW (SS-PW) applications, protection for the PW is
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