Ingress Replication Tunnels in Multicast VPN
RFC 7988
| Document | Type |
RFC - Proposed Standard
(October 2016; No errata)
Was draft-ietf-bess-ir (bess WG)
|
|
|---|---|---|---|
| Last updated | 2016-10-06 | ||
| Replaces | draft-rosen-l3vpn-ir | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Thomas Morin | ||
| Shepherd write-up | Show (last changed 2016-04-25) | ||
| IESG | IESG state | RFC 7988 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Alvaro Retana | ||
| Send notices to | aretana@cisco.com | ||
| IANA | IANA review state | IANA OK - No Actions Needed | |
| IANA action state | No IANA Actions | ||
Internet Engineering Task Force (IETF) E. Rosen, Ed.
Request for Comments: 7988 Juniper Networks, Inc.
Updates: 6513, 6514 K. Subramanian
Category: Standards Track Sproute Networks
ISSN: 2070-1721 Z. Zhang
Juniper Networks, Inc.
October 2016
Ingress Replication Tunnels in Multicast VPN
Abstract
RFCs 6513, 6514, and other RFCs describe procedures by which a
Service Provider may offer Multicast VPN (MVPN) service to its
customers. These procedures create point-to-multipoint (P2MP) or
multipoint-to-multipoint (MP2MP) trees across the Service Provider's
backbone. One type of P2MP tree that may be used is known as an
"Ingress Replication (IR) tunnel". In an IR tunnel, a parent node
need not be directly connected to its child nodes. When a parent
node has to send a multicast data packet to its n child nodes, it
does not use Layer 2 multicast, IP multicast, or MPLS multicast to do
so. Rather, it makes n individual copies, and then unicasts each
copy, through an IP or MPLS unicast tunnel, to exactly one child
node. While the prior MVPN specifications allow the use of IR
tunnels, those specifications are not always very clear or explicit
about how the MVPN protocol elements and procedures are applied to IR
tunnels. This document updates RFCs 6513 and 6514 by adding
additional details that are specific to the use of IR tunnels.
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 7841.
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/rfc7988.
Rosen, et al. Standards Track [Page 1]
RFC 7988 IR Tunnels in MVPN October 2016
Copyright Notice
Copyright (c) 2016 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
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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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. What is an IR P-tunnel? . . . . . . . . . . . . . . . . . . . 5
3. How are IR P-tunnels identified? . . . . . . . . . . . . . . 7
4. How to Join an IR P-Tunnel . . . . . . . . . . . . . . . . . 9
4.1. Advertised IR P-Tunnels . . . . . . . . . . . . . . . . . 9
4.1.1. If the Leaf Information Required Bit Is Set . . . . . 10
4.1.2. If the Leaf Information Required Bit Is Not Set . . . 10
4.2. Unadvertised IR P-Tunnels . . . . . . . . . . . . . . . . 11
5. The PTA's Tunnel Identifier Field . . . . . . . . . . . . . . 11
6. A Note on IR P-Tunnels and Discarding Packets from the Wrong
PE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7. The PTA's MPLS Label Field . . . . . . . . . . . . . . . . . 14
7.1. Leaf A-D Route Originated by an Egress PE . . . . . . . . 14
7.2. Leaf A-D Route Originated by an Intermediate Node . . . . 16
7.3. Intra-AS I-PMSI A-D Route . . . . . . . . . . . . . . . . 17
8. How A Child Node Prunes Itself from an IR P-Tunnel . . . . . 17
9. Parent Node Actions upon Receiving Leaf A-D Route . . . . . . 18
10. Use of Timers When Switching UMH . . . . . . . . . . . . . . 19
11. Security Considerations . . . . . . . . . . . . . . . . . . . 20
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 21
12.1. Normative References . . . . . . . . . . . . . . . . . . 21
12.2. Informative References . . . . . . . . . . . . . . . . . 21
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 23
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 23
Rosen, et al. Standards Track [Page 2]
RFC 7988 IR Tunnels in MVPN October 2016
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