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Protocol Independent Multicast - Sparse Mode (PIM-SM): Protocol Specification (Revised)
RFC 4601

Document type: RFC - Proposed Standard (August 2006; Errata)
Obsoletes RFC 2362
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 4601 (Proposed Standard)
Responsible AD: Alex Zinin
Send notices to: pim-chairs@tools.ietf.org

Network Working Group                                          B. Fenner
Request for Comments: 4601                          AT&T Labs - Research
Obsoletes: 2362                                               M. Handley
Category: Standards Track                                            UCL
                                                             H. Holbrook
                                                                 Arastra
                                                             I. Kouvelas
                                                                   Cisco
                                                             August 2006

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

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2006).

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 optionally
   creates shortest-path trees per source.

   This document obsoletes RFC 2362, an Experimental version of PIM-SM.

Fenner, et al.              Standards Track                     [Page 1]
RFC 4601                  PIM-SM Specification               August 2006

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 ...................................8
      3.3. Phase Three: Shortest-Path Tree ............................9
      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. (*,*,RP) State .....................................15
           4.1.3. (*,G) State ........................................16
           4.1.4. (S,G) State ........................................17
           4.1.5. (S,G,rpt) State ....................................20
           4.1.6. State Summarization Macros .........................21
      4.2. Data Packet Forwarding Rules ..............................26
           4.2.1. Last-Hop Switchover to the SPT .....................28
           4.2.2. Setting and Clearing the (S,G) SPTbit ..............29
      4.3. Designated Routers (DR) and Hello Messages ................30
           4.3.1. Sending Hello Messages .............................30
           4.3.2. DR Election ........................................32
           4.3.3. Reducing Prune Propagation Delay on LANs ...........34
           4.3.4. Maintaining Secondary Address Lists ................37
      4.4. PIM Register Messages .....................................38
           4.4.1. Sending Register Messages from the DR ..............38
           4.4.2. Receiving Register Messages at the RP ..............43
      4.5. PIM Join/Prune Messages ...................................45
           4.5.1. Receiving (*,*,RP) Join/Prune Messages .............45
           4.5.2. Receiving (*,G) Join/Prune Messages ................49
           4.5.3. Receiving (S,G) Join/Prune Messages ................53
           4.5.4. Receiving (S,G,rpt) Join/Prune Messages ............56
           4.5.5. Sending (*,*,RP) Join/Prune Messages ...............62
           4.5.6. Sending (*,G) Join/Prune Messages ..................66
           4.5.7. Sending (S,G) Join/Prune Messages ..................71
           4.5.8. (S,G,rpt) Periodic Messages ........................76
           4.5.9. State Machine for (S,G,rpt) Triggered Messages .....77

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