IGMP/MLD-Based Explicit Membership Tracking Function for Multicast Routers
draft-ietf-pim-explicit-tracking-02

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Last updated 2012-10-15
Replaces draft-asaeda-mboned-explicit-tracking
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PIM Working Group                                              H. Asaeda
Internet-Draft                                                      NICT
Intended status: Informational                                N. Leymann
Expires: April 19, 2013                              Deutsche Telekom AG
                                                        October 16, 2012

   IGMP/MLD-Based Explicit Membership Tracking Function for Multicast
                                Routers
                  draft-ietf-pim-explicit-tracking-02

Abstract

   This document describes the IGMP/MLD-based explicit membership
   tracking function for multicast routers.  The explicit tracking
   function is useful for accounting and contributes to saving network
   resource and fast leaves (i.e. shortened 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 April 19, 2013.

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   Copyright (c) 2012 IETF Trust and the persons identified as the
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Internet-Draft    Explicit Membership Tracking Function     October 2012

   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Explicit Tracking Function  . . . . . . . . . . . . . . . . . . 4
     2.1.  Specific Query Surpression Mechanism  . . . . . . . . . . . 4
     2.2.  Shortening Leave Latencies  . . . . . . . . . . . . . . . . 5
     2.3.  Considerations  . . . . . . . . . . . . . . . . . . . . . . 5
   3.  Membership State Information  . . . . . . . . . . . . . . . . . 6
   4.  Multicast Router Behavior . . . . . . . . . . . . . . . . . . . 7
   5.  Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . 8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . . . 8
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . . . 9
     9.2.  Informative References  . . . . . . . . . . . . . . . . . . 9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 9

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1.  Introduction

   The Internet Group Management Protocol (IGMP) [1] for IPv4 and the
   Multicast Listener Discovery Protocol (MLD) [2] for IPv6 are the
   standard protocols used by listener hosts and multicast routers.
   When a host starts listening 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 [4]).  This
   "unsolicited" Report is sent only once upon reception.

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

   Multicast routers are able to periodically maintain the multicast
   listener (or membership) state of downstream hosts attached on the
   same link by getting unsolicited Report messages and synchronize the
   actual membership state within the General Query timer interval
   (i.e., [Query Interval] value defined in [1][2].)  However, this
   approach does not guarantee that the membership state is always
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