IGMP/MLD-Based Explicit Membership Tracking Function for Multicast Routers
draft-ietf-pim-explicit-tracking-05

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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                       February 25, 2013
Expires: August 29, 2013

   IGMP/MLD-Based Explicit Membership Tracking Function for Multicast
                                Routers
                  draft-ietf-pim-explicit-tracking-05

Abstract

   This document describes the IGMP/MLD-based explicit membership
   tracking function for multicast routers supporting IGMPv3/MLDv2.  The
   explicit tracking function contributes to saving network resources
   and fast leaves (i.e. shortening leave latency).

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on August 29, 2013.

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Explicit Tracking Function . . . . . . . . . . . . . . . . . .  4
     3.1.  Membership State Information . . . . . . . . . . . . . . .  4
     3.2.  Specific Query Suppression . . . . . . . . . . . . . . . .  5
     3.3.  Shortening Leave Latency . . . . . . . . . . . . . . . . .  6
   4.  Lowering the Possibility of Outdated Membership State  . . . .  7
   5.  All-Zero and Unspecified Source Addresses  . . . . . . . . . .  8
   6.  Compatibility with Older Version Protocols . . . . . . . . . .  8
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  9
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     10.1. Normative References . . . . . . . . . . . . . . . . . . .  9
     10.2. Informative References . . . . . . . . . . . . . . . . . .  9
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 10

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1.  Introduction

   The Internet Group Management Protocol (IGMP) version 3 [1] for IPv4
   and the Multicast Listener Discovery Protocol (MLD) version 2 [2] for
   IPv6 are the standard protocols used by member hosts and multicast
   routers.  Lightweight IGMPv3 and Lightweight MLDv2 (or LW-IGMPv3 and
   LW-MLDv2) [3] 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 [5]).  The "unsolicited" report messages are sent only when
   the host joins/leaves the channels.

   IGMP/MLD are non-reliable protocols; the unsolicited report messages
   may be lost or may not reach upstream routers.  To alleviate the
   problem, routers need to update membership information by
   periodically sending IGMP/MLD General Query messages.  Member hosts
   then reply with "solicited" report messages whenever they receive the
   query messages.

   Multicast routers are capable of periodically maintaining the
   multicast membership state of downstream hosts attached to the same
   link by acquiring unsolicited report messages and synchronizing the
   actual membership state within the General Query timer interval
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