Protocol Independent Multicast - Sparse Mode (PIM-SM): Protocol Specification (Revised)
RFC 7761
| Document | Type |
RFC - Internet Standard
(March 2016; Errata)
Updated by RFC 8736
Obsoletes RFC 4601
Also known as STD 83
|
|
|---|---|---|---|
| Last updated | 2020-01-21 | ||
| Replaces | draft-parekh-pim-rfc4601bis | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized with errata bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Mike McBride | ||
| Shepherd write-up | Show (last changed 2014-07-01) | ||
| IESG | IESG state | RFC 7761 (Internet Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Alvaro Retana | ||
| Send notices to | aretana@cisco.com | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) B. Fenner
Request for Comments: 7761 Arista Networks
STD: 83 M. Handley
Obsoletes: 4601 UCL
Category: Standards Track H. Holbrook
ISSN: 2070-1721 I. Kouvelas
Arista Networks
R. Parekh
Cisco Systems, Inc.
Z. Zhang
Juniper Networks
L. Zheng
Huawei Technologies
March 2016
Protocol Independent Multicast - Sparse Mode (PIM-SM):
Protocol Specification (Revised)
Abstract
This document specifies Protocol Independent Multicast - Sparse Mode
(PIM-SM). PIM-SM is a multicast routing protocol that can use the
underlying unicast routing information base or a separate multicast-
capable routing information base. It builds unidirectional shared
trees rooted at a Rendezvous Point (RP) per group, and it optionally
creates shortest-path trees per source.
This document obsoletes RFC 4601 by replacing it, addresses the
errata filed against it, removes the optional (*,*,RP), PIM Multicast
Border Router features and authentication using IPsec that lack
sufficient deployment experience (see Appendix A), and moves the PIM
specification to Internet Standard.
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/rfc7761.
Fenner, et al. Standards Track [Page 1]
RFC 7761 PIM-SM Specification (Revised) March 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
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described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................5
2. Terminology .....................................................5
2.1. Definitions ................................................5
2.2. Pseudocode Notation ........................................7
3. PIM-SM Protocol Overview ........................................7
3.1. Phase One: RP Tree .........................................8
3.2. Phase Two: Register-Stop ...................................9
3.3. Phase Three: Shortest-Path Tree ...........................10
3.4. Source-Specific Joins .....................................10
3.5. Source-Specific Prunes ....................................11
3.6. Multi-Access Transit LANs .................................11
3.7. RP Discovery ..............................................12
4. Protocol Specification .........................................12
4.1. PIM Protocol State ........................................13
4.1.1. General-Purpose State ..............................14
4.1.2. (*,G) State ........................................15
4.1.3. (S,G) State ........................................17
4.1.4. (S,G,rpt) State ....................................19
4.1.5. State Summarization Macros .........................20
4.2. Data Packet Forwarding Rules ..............................24
4.2.1. Last-Hop Switchover to the SPT .....................27
4.2.2. Setting and Clearing the (S,G) SPTbit ..............27
4.3. Designated Routers (DRs) and Hello Messages ...............29
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