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IGMP/MLD-Based Explicit Membership Tracking Function for Multicast Routers
draft-ietf-pim-explicit-tracking-09

Document type: Active Internet-Draft (pim WG)
Document stream: IETF
Last updated: 2014-01-09 (latest revision 2013-12-02)
Intended RFC status: Proposed Standard
Other versions: plain text, xml, pdf, html

IETF State: Submitted to IESG for Publication
Consensus: Yes
Document shepherd: Stig Venaas
Shepherd Write-Up: Last changed 2013-10-09

IESG State: AD is watching
IANA Review State: IANA OK - No Actions Needed
IANA Action State: None
Responsible AD: Alia Atlas
Send notices to: pim-chairs@tools.ietf.org, draft-ietf-pim-explicit-tracking@tools.ietf.org

PIM Working Group                                              H. Asaeda
Internet-Draft                                                      NICT
Intended status: Standards Track                        December 3, 2013
Expires: June 6, 2014

   IGMP/MLD-Based Explicit Membership Tracking Function for Multicast
                                Routers
                  draft-ietf-pim-explicit-tracking-09

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

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 6, 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Asaeda                    Expires June 6, 2014                  [Page 1]
Internet-Draft    Explicit Membership Tracking Function    December 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  . . . . . . . . . . . . . . .   6
   7.  All-Zero and Unspecified Source Addresses . . . . . . . . . .   7
   8.  Compatibility with Older Version Protocols  . . . . . . . . .   8
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   10. Security Considerations . . . . . . . . . . . . . . . . . . .   8
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     12.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     12.2.  Informative References . . . . . . . . . . . . . . . . .   9
   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 this problem, unsolicited
   report messages are retransmitted a number of times according to the
   value of the [Robustness Variable] 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

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