Encoding Multipoint LDP (mLDP) Forwarding Equivalence Classes (FECs) in the NLRI of BGP MCAST-VPN Routes
RFC 7441

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Internet Engineering Task Force (IETF)                      IJ. Wijnands
Request for Comments: 7441                           Cisco Systems, Inc.
Updates: 6514                                                   E. Rosen
Category: Standards Track                         Juniper Networks, Inc.
ISSN: 2070-1721                                                U. Joorde
                                                        Deutsche Telekom
                                                            January 2015

  Encoding Multipoint LDP (mLDP) Forwarding Equivalence Classes (FECs)
                  in the NLRI of BGP MCAST-VPN Routes

Abstract

   Many service providers offer "BGP/MPLS IP VPN" service to their
   customers.  Existing IETF standards specify the procedures and
   protocols that a service provider uses in order to offer this service
   to customers who have IP unicast and IP multicast traffic in their
   VPNs.  It is also desirable to be able to support customers who have
   MPLS multicast traffic in their VPNs.  This document specifies the
   procedures and protocol extensions that are needed to support
   customers who use the Multipoint LDP (mLDP) as the control protocol
   for their MPLS multicast traffic.  Existing standards do provide some
   support for customers who use mLDP, but only under a restrictive set
   of circumstances.  This document generalizes the existing support to
   include all cases where the customer uses mLDP, without any
   restrictions.  This document updates RFC 6514.

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/rfc7441.

Wijnands, et al.            Standards Track                     [Page 1]
RFC 7441        mLDP FECs in NLRI of BGP MCAST-VPN Routes   January 2015

Copyright Notice

   Copyright (c) 2015 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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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   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. Why This Document is Needed .....................................3
   3. Encoding an mLDP FEC in the MCAST-VPN NLRI ......................5
   4. Wildcards .......................................................7
   5. IANA Considerations .............................................7
   6. Security Considerations .........................................8
   7. References ......................................................9
      7.1. Normative References .......................................9
      7.2. Informative References .....................................9
   Acknowledgments ...................................................10
   Authors' Addresses ................................................10

1.  Introduction

   Many service providers (SPs) offer BGP/MPLS IP VPN service to their
   customers.  When a customer has IP multicast traffic in its VPN, the
   service provider needs to signal the customer multicast states across
   the backbone.  A customer with IP multicast traffic is typically
   using PIM (Protocol Independent Multicast) [PIM] and/or IGMP
   (Internet Group Management Protocol) [IGMP] as the multicast control
   protocol in its VPN.  The IP multicast states of these protocols are
   commonly denoted as "(S,G)" and/or "(*,G)" states, where "S" is a
   multicast source address and "G" is a multicast group address.
   [MVPN-BGP] specifies the way an SP may use BGP to signal a customer's
   IP multicast states across the SP backbone.  This is done by using
   Multiprotocol BGP Updates whose Subsequent Address Family Identifier
   (SAFI) values contain the codepoint for MCAST-VPN (as defined in
   [MVPN-BGP]).  The NLRI (Network Layer Reachability Information) field
   of these BGP Updates includes a customer Multicast Source field and a
   customer Multicast Group field, thus enabling the customer's (S,G) or
   (*,G) states to be encoded in the NLRI.

Wijnands, et al.            Standards Track                     [Page 2]