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 2012Copyright 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
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described in the Simplified BSD License.
Kompella, et al. Informational [Page 2]RFC 6624 BGP Auto-Discovery and Signaling for L2VPN May 2012Table 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
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