Framework for Layer 2 Virtual Private Networks (L2VPNs)
RFC 4664

 
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Type RFC - Informational (September 2006; Errata)
Last updated 2013-03-02
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IESG state RFC 4664 (Informational)
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Network Working Group                                  L. Andersson, Ed.
Request for Comments: 4664                                      Acreo AB
Category: Informational                                    E. Rosen, Ed.
                                                     Cisco Systems, Inc.
                                                          September 2006

        Framework for Layer 2 Virtual Private Networks (L2VPNs)

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.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document provides a framework for Layer 2 Provider Provisioned
   Virtual Private Networks (L2VPNs).  This framework is intended to aid
   in standardizing protocols and mechanisms to support interoperable
   L2VPNs.

Andersson & Rosen            Informational                      [Page 1]
RFC 4664               Framework for Layer 2 VPNs         September 2006

Table of Contents

   1. Introduction ....................................................3
      1.1. Conventions Used in This Document ..........................3
      1.2. Objectives and Scope of the Document .......................3
      1.3. Layer 2 Virtual Private Networks ...........................3
      1.4. Terminology ................................................4
   2. Models ..........................................................5
      2.1. Reference Model for VPWS ...................................5
           2.1.1. Entities in the VPWS Reference Model ................5
      2.2. Reference Model for VPLS ...................................6
           2.2.1. Entities in the VPLS Reference Model ................8
      2.3. Reference Model for Distributed VPLS-PE or VPWS-PE .........9
           2.3.1. Entities in the Distributed PE Reference Models .....9
      2.4. VPWS-PE and VPLS-PE ........................................9
   3. Functional Components of L2 VPN .................................9
      3.1. Types of L2VPN ............................................10
           3.1.1. Virtual Private Wire Service (VPWS) ................10
           3.1.2. Virtual Private LAN Service (VPLS) .................10
           3.1.3. IP-Only LAN-Like Service (IPLS) ....................11
      3.2. Generic L2VPN Transport Functional Components .............11
           3.2.1. Attachment Circuits ................................11
           3.2.2. Pseudowires ........................................12
           3.2.3. Forwarders .........................................14
           3.2.4. Tunnels ............................................15
           3.2.5. Encapsulation ......................................16
           3.2.6. Pseudowire Signaling ...............................16
                  3.2.6.1. Point-to-Point Signaling ..................18
                  3.2.6.2. Point-to-Multipoint Signaling .............18
                  3.2.6.3. Inter-AS Considerations ...................19
           3.2.7. Service Quality ....................................20
                  3.2.7.1. Quality of Service (QoS) ..................20
                  3.2.7.2. Resiliency ................................21
           3.2.8. Management .........................................22
      3.3. VPWS ......................................................22
           3.3.1. Provisioning and Auto-Discovery ....................23
                  3.3.1.1. Attachment Circuit Provisioning ...........23
                  3.3.1.2. PW Provisioning for Arbitrary
                           Overlay Topologies ........................23
                  3.3.1.3. Colored Pools PW Provisioning Model .......25
           3.3.2. Requirements on Auto-Discovery Procedures ..........27
           3.3.3. Heterogeneous Pseudowires ..........................28
      3.4. VPLS Emulated LANs ........................................29
           3.4.1. VPLS Overlay Topologies and Forwarding .............31
           3.4.2. Provisioning and Auto-Discovery ....................33
           3.4.3. Distributed PE .....................................33
           3.4.4. Scaling Issues in VPLS Deployment ..................36
      3.5. IP-Only LAN-Like Service (IPLS) ...........................36

Andersson & Rosen            Informational                      [Page 2]
RFC 4664               Framework for Layer 2 VPNs         September 2006

   4. Security Considerations ........................................37
      4.1. Provider Network Security Issues ..........................37
      4.2. Provider-Customer Network Security Issues .................39
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