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 2012Copyright Notice
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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
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