Layer 2 Virtual Private Networks Using BGP for Auto-Discovery and Signaling
RFC 6624

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Internet Engineering Task Force (IETF)                       K. Kompella
Request for Comments: 6624                              Juniper Networks
Category: Informational                                       B. Kothari
ISSN: 2070-1721                                            Cisco Systems
                                                            R. Cherukuri
                                                        Juniper Networks
                                                                May 2012

             Layer 2 Virtual Private Networks Using BGP for
                      Auto-Discovery and Signaling

Abstract

   Layer 2 Virtual Private Networks (L2VPNs) based on Frame Relay or ATM
   circuits have been around a long time; more recently, Ethernet VPNs,
   including Virtual Private LAN Service, have become popular.
   Traditional L2VPNs often required a separate Service Provider
   infrastructure for each type and yet another for the Internet and IP
   VPNs.  In addition, L2VPN provisioning was cumbersome.  This document
   presents a new approach to the problem of offering L2VPN services
   where the L2VPN customer's experience is virtually identical to that
   offered by traditional L2VPNs, but such that a Service Provider can
   maintain a single network for L2VPNs, IP VPNs, and the Internet, as
   well as a common provisioning methodology for all services.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc6624.

Kompella, et al.              Informational                     [Page 1]
RFC 6624       BGP Auto-Discovery and Signaling for L2VPN       May 2012

Copyright Notice

   Copyright (c) 2012 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Kompella, et al.              Informational                     [Page 2]
RFC 6624       BGP Auto-Discovery and Signaling for L2VPN       May 2012

Table of Contents

   1. Introduction ....................................................3
      1.1. Terminology ................................................6
           1.1.1. Conventions Used in This Document ...................6
      1.2. Advantages of Layer 2 VPNs .................................6
           1.2.1. Separation of Administrative Responsibilities .......7
           1.2.2. Migrating from Traditional Layer 2 VPNs .............7
           1.2.3. Privacy of Routing ..................................7
           1.2.4. Layer 3 Independence ................................7
           1.2.5. PE Scaling ..........................................8
           1.2.6. Ease of Configuration ...............................8
      1.3. Advantages of Layer 3 VPNs .................................9
           1.3.1. Layer 2 Independence ................................9
           1.3.2. SP Routing as Added Value ..........................10
           1.3.3. Class of Service ...................................10
      1.4. Multicast Routing .........................................10
   2. Operation of a Layer 2 VPN .....................................11
      2.1. Network Topology ..........................................11
      2.2. Configuration .............................................13
           2.2.1. CE Configuration ...................................14
           2.2.2. PE Configuration ...................................15
           2.2.3. Adding a New Site ..................................15
           2.2.4. Deleting a Site ....................................16
           2.2.5. Managing CE ID Mappings ............................16
           2.2.6. Managing Label Blocks ..............................16
      2.3. Operations, Administration, and Maintenance (OAM) .........17
   3. PE Information Exchange ........................................17