2.5.2 Inter-Domain Multicast Routing (idmr)

NOTE: This charter is a snapshot of the 50th IETF Meeting in Minneapolis, Minnesota. It may now be out-of-date. Last Modified: 14-Mar-01


Bill Fenner <fenner@research.att.com>

Routing Area Director(s):

David Oran <oran@cisco.com>
Rob Coltun <rcoltun@redback.com>

Routing Area Advisor:

Rob Coltun <rcoltun@redback.com>

Mailing Lists:

General Discussion:idmr@cs.ucl.ac.uk
To Subscribe: idmr-request@cs.ucl.ac.uk
Archive: ftp://ftp.ietf.org/ietf-mail-archive/idmr/

Description of Working Group:

The Internet-Draft Multicast Remnants (idmr) working group is chartered to finish certain parts of the work started in the Inter-Domain Multicast Routing (idmr) working group. The group is expected to live only long enough to see the existing work items progress through the standards track, and is not expected to take on new work items.

The specific work items are:
DVMRP, DVMRP MIB, Domain Wide Reports, IGMP MIB, IGMP Proxying, IGMPv2, IGMPv3, Multicast Interop, Multicast Router Discovery, Multicast Routing MIB, and Multicast Traceroute.

Goals and Milestones:

Nov 99


All specs to at least Proposed Standard. MIBs may lag.

Mar 00


All MIBs to at least Proposed.

Jul 00


Address any spec issues; all documents to Draft if no major problems

Nov 00


All documents to Standard if no major problems. Disband WG.

Request For Comments:






Scalable Multicast Key Distribution



Core Based Trees (CBT) Multicast Routing Architecture



Core Based Trees (CBT version 2) Multicast Routing -- Protocol Specification --



Internet Group Management Protocol, Version 2



Protocol Independent Multicast-Sparse Mode (PIM-SM): Protocol Specification



Interoperability Rules for Multicast Routing Protocols



IPv4 Multicast Routing MIB



Internet Group Management Protocol MIB



Protocol Independent Multicast MIB for IPv4

Current Meeting Report

IDMR met in one meeting at the 50th IETF.

These minutes are reported by Bill Fenner.

After the usual agenda bashing and document status session, there were four presentations of new work.

Isidor Kouvelas presented MSNIP, the Multicast Source Notification of Interest Protocol, draft-ietf-idmr-msnip-00.{txt,ps}. This protocol allows routers to notify an end system when there is interest in reception of a given SSM stream (see the presentation slides for more details). There was interest expressed in a more general protocol that would allow handle non-SSM groups and also work with no router present. No course of action was decided upon at the meeting.

Brian Haberman presented a document on the interactions between IGMPv3 and routing protocols, draft-ietf-idmr-igmpv3-and-routing-00.txt .

Haixang He presented draft-he-mixed-igmp-proxy-00.txt, an extension to the ideas in draft-fenner-igmp-proxy-04.txt, to allow different IGMP versions on different interfaces. The authors of the two specs decided to work together on a single proxying spec.

Morten Christensen presented a document on IGMP snooping, draft-ietf-idmr-snoop-00.txt . This document includes the problems that it introduces and some education for switch vendors.

Bill Fenner and Brian Haberman then presented a proposal to terminate the IDMR working group and spin up a new working group, called MAGMA -- Multicast/Anycast Group Membership. Since IDMR's work items are almost completely IGMP, it doesn't make sense to have a routing-area group, and IDMR's history still includes some overhead. There was wide support in the meeting for this change.


IGMPv3 and Multicast Routing Protocols
IGMP Mixed Version Proxying
Multicast Source Notification of Interest Protocol (MSNIP)
IGMP Snooping Switches