Multicast in MPLS/BGP IP VPNs
RFC 6513
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RFC - Proposed Standard
(February 2012; Errata)
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2015-10-14
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IETF
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RFC 6513 (Proposed Standard)
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Stewart Bryant
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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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