Mandatory Features in a Layer 3 Multicast BGP/MPLS VPN Solution
RFC 6517

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Internet Engineering Task Force (IETF)                     T. Morin, Ed.
Request for Comments: 6517                       France Telecom - Orange
Category: Informational                            B. Niven-Jenkins, Ed.
ISSN: 2070-1721                                                       BT
                                                               Y. Kamite
                                                      NTT Communications
                                                                R. Zhang
                                                          Alcatel-Lucent
                                                              N. Leymann
                                                        Deutsche Telekom
                                                                N. Bitar
                                                                 Verizon
                                                           February 2012

    Mandatory Features in a Layer 3 Multicast BGP/MPLS VPN Solution

Abstract

   More that one set of mechanisms to support multicast in a layer 3
   BGP/MPLS VPN has been defined.  These are presented in the documents
   that define them as optional building blocks.

   To enable interoperability between implementations, this document
   defines a subset of features that is considered mandatory for a
   multicast BGP/MPLS VPN implementation.  This will help implementers
   and deployers understand which L3VPN multicast requirements are best
   satisfied by each option.

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/rfc6517.

Morin, et al.                 Informational                     [Page 1]
RFC 6517            Multicast VPN Mandatory Features       February 2012

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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Examining Alternative Mechanisms for MVPN Functions  . . . . .  4
     3.1.  MVPN Auto-Discovery  . . . . . . . . . . . . . . . . . . .  4
     3.2.  S-PMSI Signaling . . . . . . . . . . . . . . . . . . . . .  5
     3.3.  PE-PE Exchange of C-Multicast Routing  . . . . . . . . . .  7
       3.3.1.  PE-PE C-Multicast Routing Scalability  . . . . . . . .  7
       3.3.2.  PE-CE Multicast Routing Exchange Scalability . . . . . 10
       3.3.3.  Scalability of P Routers . . . . . . . . . . . . . . . 10
       3.3.4.  Impact of C-Multicast Routing on Inter-AS Deployments  10
       3.3.5.  Security and Robustness  . . . . . . . . . . . . . . . 11
       3.3.6.  C-Multicast VPN Join Latency . . . . . . . . . . . . . 12
       3.3.7.  Conclusion on C-Multicast Routing  . . . . . . . . . . 14
     3.4.  Encapsulation Techniques for P-Multicast Trees . . . . . . 15
     3.5.  Inter-AS Deployments Options . . . . . . . . . . . . . . . 16
     3.6.  BIDIR-PIM Support  . . . . . . . . . . . . . . . . . . . . 19
   4.  Co-Located RPs . . . . . . . . . . . . . . . . . . . . . . . . 20
   5.  Avoiding Duplicates  . . . . . . . . . . . . . . . . . . . . . 21
   6.  Existing Deployments . . . . . . . . . . . . . . . . . . . . . 21
   7.  Summary of Recommendations . . . . . . . . . . . . . . . . . . 22
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 22
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 23
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 23
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 23
     10.2. Informative References . . . . . . . . . . . . . . . . . . 23
   Appendix A.  Scalability of C-Multicast Routing Processing Load  . 25
     A.1.  Scalability with an Increased Number of PEs  . . . . . . . 26