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Protocol Independent Multicast - Dense Mode (PIM-DM): Protocol Specification (Revised)
RFC 3973

Document type: RFC - Experimental (January 2005; Errata)
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 3973 (Experimental)
Responsible AD: Alex Zinin
Send notices to: pusateri@juniper.net, lwei@redback.com, mcbride@cisco.com

Network Working Group                                           A. Adams
Request for Comments: 3973                          NextHop Technologies
Category: Experimental                                       J. Nicholas
                                                                ITT A/CD
                                                               W. Siadak
                                                    NextHop Technologies
                                                            January 2005

         Protocol Independent Multicast - Dense Mode (PIM-DM):
                    Protocol Specification (Revised)

Status of This Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This document specifies Protocol Independent Multicast - Dense Mode
   (PIM-DM).  PIM-DM is a multicast routing protocol that uses the
   underlying unicast routing information base to flood multicast
   datagrams to all multicast routers.  Prune messages are used to
   prevent future messages from propagating to routers without group
   membership information.

Adams, et al.                 Experimental                      [Page 1]
RFC 3973                   PIM - Dense Mode                 January 2005

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
       2.1.  Definitions  . . . . . . . . . . . . . . . . . . . . . .  4
       2.2.  Pseudocode Notation  . . . . . . . . . . . . . . . . . .  5
   3.  PIM-DM Protocol Overview . . . . . . . . . . . . . . . . . . .  5
   4.  Protocol Specification . . . . . . . . . . . . . . . . . . . .  6
       4.1.  PIM Protocol State . . . . . . . . . . . . . . . . . . .  7
             4.1.1.  General Purpose State  . . . . . . . . . . . . .  7
             4.1.2.  (S,G) State  . . . . . . . . . . . . . . . . . .  8
             4.1.3.  State Summarization Macros . . . . . . . . . . .  8
       4.2.  Data Packet Forwarding Rules . . . . . . . . . . . . . . 10
       4.3.  Hello Messages . . . . . . . . . . . . . . . . . . . . . 11
             4.3.1.  Sending Hello Messages . . . . . . . . . . . . . 11
             4.3.2.  Receiving Hello Messages . . . . . . . . . . . . 11
             4.3.3.  Hello Message Hold Time  . . . . . . . . . . . . 12
             4.3.4.  Handling Router Failures . . . . . . . . . . . . 12
             4.3.5.  Reducing Prune Propagation Delay on LANs . . . . 13
       4.4.  PIM-DM Prune, Join, and Graft Messages . . . . . . . . . 13
             4.4.1.  Upstream Prune, Join, and Graft Messages . . . . 14
                     4.4.1.1.  Transitions from the Forwarding
                               (F) State  . . . . . . . . . . . . . . 17
                     4.4.1.2.  Transitions from the Pruned
                               (P) State  . . . . . . . . . . . . . . 18
                     4.4.1.3.  Transitions from the AckPending
                               (AP) State . . . . . . . . . . . . . . 19
             4.4.2.  Downstream Prune, Join, and Graft Messages . . . 21
                     4.4.2.1.  Transitions from the NoInfo State  . . 23
                     4.4.2.2.  Transitions from the PrunePending
                               (PP) State . . . . . . . . . . . . . . 24
                     4.4.2.3.  Transitions from the Prune
                               (P) State  . . . . . . . . . . . . . . 25
       4.5.  State Refresh  . . . . . . . . . . . . . . . . . . . . . 26
             4.5.1.  Forwarding of State Refresh Messages . . . . . . 26
             4.5.2.  State Refresh Message Origination  . . . . . . . 28
                     4.5.2.1.  Transitions from the NotOriginator
                               (NO) State . . . . . . . . . . . . . . 29
                     4.5.2.2.  Transitions from the Originator
                               (O) State  . . . . . . . . . . . . . . 29

Adams, et al.                 Experimental                      [Page 2]
RFC 3973                   PIM - Dense Mode                 January 2005

       4.6.  PIM Assert Messages  . . . . . . . . . . . . . . . . . . 30
             4.6.1.  Assert Metrics . . . . . . . . . . . . . . . . . 30
             4.6.2.  AssertCancel Messages  . . . . . . . . . . . . . 31
             4.6.3.  Assert State Macros  . . . . . . . . . . . . . . 32
             4.6.4.  (S,G) Assert Message State Machine . . . . . . . 32
                     4.6.4.1.  Transitions from NoInfo State  . . . . 34
                     4.6.4.2.  Transitions from Winner State  . . . . 35

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