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Multicast in MPLS/BGP IP VPNs
RFC 6513

Internet Engineering Task Force (IETF)                     E. Rosen, Ed.
Request for Comments: 6513                           Cisco Systems, Inc.
Category: Standards Track                               R. Aggarwal, Ed.
ISSN: 2070-1721                                         Juniper Networks
                                                           February 2012

                     Multicast in MPLS/BGP IP VPNs

Abstract

   In order for IP multicast traffic within a BGP/MPLS IP VPN (Virtual
   Private Network) to travel from one VPN site to another, special
   protocols and procedures must be implemented by the VPN Service
   Provider.  These protocols and procedures are specified in this
   document.

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/rfc6513.

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.

Rosen & Aggarwal             Standards Track                    [Page 1]
RFC 6513              Multicast in MPLS/BGP IP VPNs        February 2012

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................5
   2.  Overview .......................................................5
      2.1. Optimality vs. Scalability .................................5
           2.1.1. Multicast Distribution Trees ........................7
           2.1.2. Ingress Replication through Unicast Tunnels .........8
      2.2. Multicast Routing Adjacencies ..............................8
      2.3. MVPN Definition ............................................9
      2.4. Auto-Discovery ............................................10
      2.5. PE-PE Multicast Routing Information .......................11
      2.6. PE-PE Multicast Data Transmission .........................11
      2.7. Inter-AS MVPNs ............................................12
      2.8. Optionally Eliminating Shared Tree State ..................13
   3. Concepts and Framework .........................................13
      3.1. PE-CE Multicast Routing ...................................13
      3.2. P-Multicast Service Interfaces (PMSIs) ....................14
           3.2.1. Inclusive and Selective PMSIs ......................15
           3.2.2. P-Tunnels Instantiating PMSIs ......................16
      3.3. Use of PMSIs for Carrying Multicast Data ..................18
      3.4. PE-PE Transmission of C-Multicast Routing .................20
           3.4.1. PIM Peering ........................................20
                  3.4.1.1. Full per-MVPN PIM Peering across
                           an MI-PMSI ................................20
                  3.4.1.2. Lightweight PIM Peering across an MI-PMSI .20
                  3.4.1.3. Unicasting of PIM C-Join/Prune Messages ...21
           3.4.2. Using BGP to Carry C-Multicast Routing .............22
   4. BGP-Based Auto-Discovery of MVPN Membership ....................22
   5. PE-PE Transmission of C-Multicast Routing ......................25
      5.1. Selecting the Upstream Multicast Hop (UMH) ................25

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