Provisioning, Auto-Discovery, and Signaling in Layer 2 Virtual Private Networks (L2VPNs)
RFC 6074

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Internet Engineering Task Force (IETF)                          E. Rosen
Request for Comments: 6074                                      B. Davie
Category: Standards Track                            Cisco Systems, Inc.
ISSN: 2070-1721                                               V. Radoaca
                                                          Alcatel-Lucent
                                                                  W. Luo
                                                            January 2011

              Provisioning, Auto-Discovery, and Signaling
              in Layer 2 Virtual Private Networks (L2VPNs)

Abstract

   Provider Provisioned Layer 2 Virtual Private Networks (L2VPNs) may
   have different "provisioning models", i.e., models for what
   information needs to be configured in what entities.  Once
   configured, the provisioning information is distributed by a
   "discovery process".  When the discovery process is complete, a
   signaling protocol is automatically invoked to set up the mesh of
   pseudowires (PWs) that form the (virtual) backbone of the L2VPN.
   This document specifies a number of L2VPN provisioning models, and
   further specifies the semantic structure of the endpoint identifiers
   required by each model.  It discusses the distribution of these
   identifiers by the discovery process, especially when discovery is
   based on the Border Gateway Protocol (BGP).  It then specifies how
   the endpoint identifiers are carried in the two signaling protocols
   that are used to set up PWs, the Label Distribution Protocol (LDP),
   and the Layer 2 Tunneling Protocol version 3 (L2TPv3).

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/rfc6074.

Rosen, et al.                Standards Track                    [Page 1]
RFC 6074                     L2VPN Signaling                January 2011

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   document authors.  All rights reserved.

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   Without obtaining an adequate license from the person(s) controlling
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   it for publication as an RFC or to translate it into languages other
   than English.

Rosen, et al.                Standards Track                    [Page 2]
RFC 6074                     L2VPN Signaling                January 2011

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Signaling Protocol Framework . . . . . . . . . . . . . . . . .  5
     2.1.  Endpoint Identification  . . . . . . . . . . . . . . . . .  5
     2.2.  Creating a Single Bidirectional Pseudowire . . . . . . . .  7
     2.3.  Attachment Identifiers and Forwarders  . . . . . . . . . .  7
   3.  Applications . . . . . . . . . . . . . . . . . . . . . . . . .  9
     3.1.  Individual Point-to-Point Pseudowires  . . . . . . . . . .  9
       3.1.1.  Provisioning Models  . . . . . . . . . . . . . . . . .  9
         3.1.1.1.  Double-Sided Provisioning  . . . . . . . . . . . .  9
         3.1.1.2.  Single-Sided Provisioning with Discovery . . . . .  9
       3.1.2.  Signaling  . . . . . . . . . . . . . . . . . . . . . . 10
     3.2.  Virtual Private LAN Service  . . . . . . . . . . . . . . . 11
       3.2.1.  Provisioning . . . . . . . . . . . . . . . . . . . . . 11
       3.2.2.  Auto-Discovery . . . . . . . . . . . . . . . . . . . . 12