IGMP/MLD-Based Explicit Membership Tracking Function for Multicast Routers
draft-ietf-pim-explicit-tracking-08

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Last updated 2013-11-11 (latest revision 2013-10-07)
Replaces draft-asaeda-mboned-explicit-tracking
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PIM Working Group                                              H. Asaeda
Internet-Draft                                                      NICT
Intended status: Standards Track                        October 07, 2013
Expires: April 10, 2014

   IGMP/MLD-Based Explicit Membership Tracking Function for Multicast
                                Routers
                  draft-ietf-pim-explicit-tracking-08

Abstract

   This document describes the IGMP/MLD-based explicit membership
   tracking function for multicast routers and IGMP/MLD proxy devices
   supporting IGMPv3/MLDv2.  The explicit membership tracking function
   contributes to saving network resources and shortening leave latency.

Status of This Memo

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   This Internet-Draft will expire on April 10, 2014.

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   Copyright (c) 2013 IETF Trust and the persons identified as the
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Asaeda                   Expires April 10, 2014                 [Page 1]
Internet-Draft    Explicit Membership Tracking Function     October 2013

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Membership State Information  . . . . . . . . . . . . . . . .   4
   4.  Specific Query Suppression  . . . . . . . . . . . . . . . . .   4
   5.  Shortening Leave Latency  . . . . . . . . . . . . . . . . . .   6
   6.  Risk of Wrong Membership State  . . . . . . . . . . . . . . .   7
   7.  All-Zero and Unspecified Source Addresses . . . . . . . . . .   7
   8.  Compatibility with Older Version Protocols  . . . . . . . . .   8
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   10. Security Considerations . . . . . . . . . . . . . . . . . . .   9
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     12.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     12.2.  Informative References . . . . . . . . . . . . . . . . .  10
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The Internet Group Management Protocol (IGMP) version 3 [2] for IPv4
   and the Multicast Listener Discovery Protocol (MLD) version 2 [3] for
   IPv6 are the standard protocols used by member hosts and multicast
   routers.  Lightweight IGMPv3 and Lightweight MLDv2 (or LW-IGMPv3 and
   LW-MLDv2) [4] are subsets of the standard IGMPv3 and MLDv2.

   When a host starts/finishes listening to particular multicast
   channels, it sends IGMP/MLD State-Change Report messages specifying
   the corresponding channel information as the join/leave request to
   its upstream router (i.e., an adjacent multicast router or IGMP/MLD
   proxy device [8]).  The "unsolicited" report messages are sent only
   when the host joins/leaves the channels.  Since IGMP/MLD are non-
   reliable protocols, unsolicited report messages may be lost or may
   not reach upstream routers.  To alleviate the problem, unsolicited
   report messages are transmitted the [Robustness Variable] times
   (defined in [2][3]).

   Also, a querier router periodically sends IGMP/MLD General Query
   messages every General Query timer interval (i.e. [Query Interval]
   value defined in [2][3]).  Upon receiving the query messages, the
   member hosts reply with "solicited" report messages.  Routers then
   keep their membership state information up to date.  However, this
   approach still does not guarantee that the membership state is always
   perfectly synchronized.  To minimize the possibility of having
   outdated membership information, routers may shorten the periodic
   General Query timer interval.  Unfortunately, this increases the
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