IGMP/MLD-Based Explicit Membership Tracking Function for Multicast Routers
draft-ietf-pim-explicit-tracking-06

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Replaces draft-asaeda-mboned-explicit-tracking
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PIM Working Group                                              H. Asaeda
Internet-Draft                                                      NICT
Intended status: Standards Track                           July 15, 2013
Expires: January 16, 2014

   IGMP/MLD-Based Explicit Membership Tracking Function for Multicast
                                Routers
                  draft-ietf-pim-explicit-tracking-06

Abstract

   This document describes the IGMP/MLD-based explicit membership
   tracking function for multicast routers supporting IGMPv3/MLDv2.  The
   explicit membership tracking function contributes to saving network
   resources and shortening leave latency, and enables operators to see
   which downstream routers(s) on a LAN are joined to which multicast
   tree.

Status of This Memo

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   This Internet-Draft will expire on January 16, 2014.

Copyright Notice

   Copyright (c) 2013 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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   (http://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of

Asaeda                  Expires January 16, 2014                [Page 1]
Internet-Draft    Explicit Membership Tracking Function        July 2013

   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

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

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 within the 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
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