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Internal BGP as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private Networks (VPNs)
RFC 6368

Internet Engineering Task Force (IETF)                        P. Marques
Request for Comments: 6368
Category: Standards Track                                      R. Raszuk
ISSN: 2070-1721                                                  NTT MCL
                                                                K. Patel
                                                           Cisco Systems
                                                               K. Kumaki
                                                             T. Yamagata
                                                        KDDI Corporation
                                                          September 2011

        Internal BGP as the Provider/Customer Edge Protocol for
              BGP/MPLS IP Virtual Private Networks (VPNs)

Abstract

   This document defines protocol extensions and procedures for BGP
   Provider/Customer Edge router iteration in BGP/MPLS IP VPNs.  These
   extensions and procedures have the objective of making the usage of
   the BGP/MPLS IP VPN transparent to the customer network, as far as
   routing information is concerned.

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/rfc6368.

Marques, et al.              Standards Track                    [Page 1]
RFC 6368             Internal BGP as PE/CE Protocol       September 2011

Copyright Notice

   Copyright (c) 2011 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.

Table of Contents

   1. Introduction ....................................................2
   2. Requirements Language ...........................................3
   3. IP VPN as a Route Server ........................................3
   4. Path Attributes .................................................5
   5. BGP Customer Route Attributes ...................................6
   6. Next-Hop Handling ...............................................7
   7. Exchanging Routes between Different VPN Customer Networks .......8
   8. Deployment Considerations ......................................10
   9. Security Considerations ........................................12
   10. IANA Considerations ...........................................12
   11. Acknowledgments ...............................................12
   12. References ....................................................13
      12.1. Normative References .....................................13
      12.2. Informative References ...................................13

1.  Introduction

   In current deployments, when BGP is used as the Provider/Customer
   Edge routing protocol, these peering sessions are typically
   configured as an external peering between the VPN provider autonomous
   system (AS) and the customer network autonomous system.  At each
   External BGP boundary, BGP path attributes [RFC4271] are modified as
   per standard BGP rules.  This includes prepending the AS_PATH
   attribute with the autonomous-system number of the originating
   Customer Edge (CE) router and the autonomous-system number(s) of the
   Provider Edge (PE) router(s).

Marques, et al.              Standards Track                    [Page 2]
RFC 6368             Internal BGP as PE/CE Protocol       September 2011

   In order for such routes not to be rejected by AS_PATH loop
   detection, a PE router advertising a route received from a remote PE
   often remaps the customer network autonomous-system number to its
   own.  Otherwise, the customer network can use different autonomous-
   system numbers at different sites or configure their CE routers to
   accept routes containing their own AS number.

   While this technique works well in situations where there are no BGP

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