Requirements for Multi-Segment Pseudowire Emulation Edge-to-Edge (PWE3)
RFC 5254

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Network Working Group                                      N. Bitar, Ed.
Request for Comments: 5254                                       Verizon
Category: Informational                                    M. Bocci, Ed.
                                                          Alcatel-Lucent
                                                         L. Martini, Ed.
                                                     Cisco Systems, Inc.
                                                            October 2008

Requirements for Multi-Segment Pseudowire Emulation Edge-to-Edge (PWE3)

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Abstract

   This document describes the necessary requirements to allow a service
   provider to extend the reach of pseudowires across multiple domains.
   These domains can be autonomous systems under one provider
   administrative control, IGP areas in one autonomous system, different
   autonomous systems under the administrative control of two or more
   service providers, or administratively established pseudowire
   domains.

Bitar, et al.                Informational                      [Page 1]
RFC 5254          Requirements for Multi-Segment PWE3       October 2008

Table of Contents

   1. Introduction ....................................................3
      1.1. Scope ......................................................3
      1.2. Architecture ...............................................3
   2. Terminology .....................................................6
      2.1. Specification of Requirements ..............................6
   3. Use Cases .......................................................7
      3.1. Multi-Segment Pseudowire Setup Mechanisms ..................9
   4. Multi-Segment Pseudowire Requirements ..........................10
      4.1. All Mechanisms ............................................10
           4.1.1. Architecture .......................................10
           4.1.2. Resiliency .........................................11
           4.1.3. Quality of Service .................................11
           4.1.4. Congestion Control .................................12
           4.1.5  Generic Requirements for MS-PW Setup Mechanisms ....13
           4.1.6. Routing ............................................14
      4.2. Statically Configured MS-PWs ..............................15
           4.2.1. Architecture .......................................15
           4.2.2. MPLS-PWs ...........................................15
           4.2.3. Resiliency .........................................15
           4.2.4. Quality of Service .................................16
      4.3. Signaled PW Segments ......................................16
           4.3.1. Architecture .......................................16
           4.3.2. Resiliency .........................................16
           4.3.3. Quality of Service .................................17
           4.3.4. Routing ............................................17
           4.3.5. Additional Requirements on Signaled MS-PW Setup
                  Mechanisms .........................................17
      4.4. Signaled PW / Dynamic Route ...............................18
           4.4.1. Architecture .......................................18
           4.4.2. Resiliency .........................................18
           4.4.3. Quality of Service .................................18
           4.4.4. Routing ............................................18
   5. Operations and Maintenance (OAM) ...............................19
   6. Management of Multi-Segment Pseudowires ........................20
      6.1. MIB Requirements ..........................................20
      6.2. Management Interface Requirements .........................21
   7. Security Considerations ........................................21
      7.1. Inter-Provider MS-PWs .....................................21
           7.1.1. Data-Plane Security Requirements ...................21
           7.1.2. Control-Plane Security Requirements ................23
      7.2. Intra-Provider MS-PWs .....................................25
   8. Acknowledgments ................................................25
   9. References .....................................................25
      9.1. Normative References ......................................25
      9.2. Informative References ....................................25

Bitar, et al.                Informational                      [Page 2]
RFC 5254          Requirements for Multi-Segment PWE3       October 2008

1.  Introduction

1.1.  Scope

   This document specifies requirements for extending pseudowires across
   more than one packet switched network (PSN) domain and/or more than