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.

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

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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