Protocol Independent Multicast - Sparse Mode (PIM-SM): Protocol Specification (Revised)
RFC 7761

Document Type RFC - Internet Standard (March 2016; No errata)
Obsoletes RFC 4601
Also known as STD 83
Last updated 2016-03-11
Replaces draft-parekh-pim-rfc4601bis
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Stream WG state Submitted to IESG for Publication
Document shepherd Mike McBride
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IESG IESG state RFC 7761 (Internet Standard)
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Responsible AD Alvaro Retana
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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
   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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   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
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