Multicast & Anycast Group Membership (magma)
--------------------------------------------

Charter
Last Modified: 2006-04-18

Current Status: Active Working Group

Chair(s):
    Brian Haberman  <[email protected]>
    Isidor Kouvelas  <[email protected]>

Internet Area Director(s):
    Ralph Droms  <[email protected]>
    Jari Arkko  <[email protected]>
    Mark Townsley  <[email protected]>

Internet Area Advisor:
    Jari Arkko  <[email protected]>

Mailing Lists:
    General Discussion:[email protected]
    To Subscribe:      [email protected]
        In Body:       subscribe
    Archive:           http://www.ietf.org/mail-archive/web/magma/index.html

Description of Working Group:

Group management protocols are crucial to the operation of multicast
within the Internet, and there are some benefits in extending group
management protocols to also be able to support anycast. These
protocols allow hosts to inform routers of their membership status
within groups.  This working group will be responsible for developing
the functionalities required for group membership reporting and other
related actions.  This group will also address the initial
authentication and access control issues associated with anycast group
membership; this is likely to be limited to shared secrets and message
authentication codes (MACs) much like current routing protocol
security.  Other aspects of Anycast, including architecture and
routing, are outside the groups scope.

The draft names listed below are the starting point for the work in
the
WG.

MAGMA specifications will include:

- Core IGMPv3/MLDv2 specifications.  These specifications will describe
 the protocol used between hosts and routers to share group membership
 information.  IGMPv3 and MLDv2 build on IGMPv2 and MLDv1 by adding
 two types of source-specific filtering; "include" (in which the
 system tells the router exactly which sources it desires) and
 "exclude" (in which the system tells the router that it does *not*
 desire a list of sources).

 - IGMPv3: The IDMR working group has submitted this for Proposed
    Standard.
    MAGMA takes ownership after publication as RFC.

 - MLDv2: draft-vida-mld-v2-00.txt

- Multicast Source Filtering API.  This specification describes the API
 used to interact with IGMPv3 and MLDv2 to indicate source filters.

 - draft-ietf-idmr-msf-api-01.txt

- Host determination of network group membership.  In a multicast
 environment, systems may be interested in learning whether or not
 there are any group members, in order to save the trouble of sending
 data that nobody is listening to.

  - Multicast Source Notification of Interest Protocol:
    draft-ietf-idmr-msnip-00

- Multicast forwarding in tree topologies using IGMP/MLD Proxying
 - Create a single document from:
   - draft-ietf-idmr-igmp-proxy-00

   - draft-he-mixed-igmp-proxy-00

- Source-Specific Multicast (SSM) consideration document.  This work
 will describe the use of IGMPv3/MLDv2 in an SSM environment.
 - draft-holbrook-idmr-igmpv3-ssm-01.txt

- Considerations for "IGMP snooping" switches (switches that watch IGMP
 exchanges in order to determine multicast forwarding behavior)

- Multicast Router Discovery:
 The MAGMA group has taken ownership of this draft over from IDMR.
 It will be revised and submitted as a Proposed Standard.

- Snooping Considerations: draft-ietf-magma-mrdisc-00.txt
 (previous revisions draft-ietf-idmr-snoop-XX.txt)

- Group management MIBs
 - update RFC 2933 for IGMPv3
 - update RFC 3019 for MLDv2

- Interaction between IGMP/MLD and routing protocols
 - draft-ietf-idmr-igmpv3-and-routing-00.txt

- Extensions to MLD supporting anycast group memberships including
 authentication and access control mechanisms
 - draft-haberman-ipngwg-host-anycast-00.txt

In addition, this working group will coordinate with other IETF working
groups where multicast and anycast group management protocols are
utilized as well as coordinating with the Multicast Security WG.

Goals and Milestones:

  Done         Submit IGMPv3/MLDv2 Interfactions with Routing Protocols as
               Informational

  Done         Submit IGMP/MLD Proxying Specification as Proposed Standard

  Done         Submit IGMP & MLD Snooping Considerations as Informational

  Done         Submit SSM considerations for IGMPv3 & MLDv2 as Proposed
               Standard

  Done         Submit Multicast Source Filtering API as Informational

  Done         Submit MRD as Proposed Standard

  Done         Submit IGMPv3/MLDv2 MIB as Proposed Standard


Internet-Drafts:

Posted Revised         I-D Title   <Filename>
------ ------- --------------------------------------------
Jun 2003 Feb 2009   <draft-ietf-magma-mgmd-mib-15.txt>
               Multicast Group Membership Discovery MIB

Request For Comments:

 RFC   Stat Published     Title
------- -- ----------- ------------------------------------
RFC3228BCP  Feb 2002    IANA Considerations for IGMP

RFC3590 PS   Sep 2003    Source Address Selection for the Multicast Listener
                      Discovery (MLD) Protocol

RFC3678 I    Jan 2004    Socket Interface Extensions for Multicast Source Filters

RFC3810Standard  Jun 2004    Multicast Listener Discovery Version 2 (MLDv2) for IPv6

RFC4286Standard  Dec 2005    Multicast Router Discovery

RFC4541 I    May 2006    Considerations for Internet Group Management Protocol
                      (IGMP) and Multicast Listener Discovery (MLD) Snooping
                      Switches

RFC4604 PS   Aug 2006    Using Internet Group Management Protocol Version 3
                      (IGMPv3) and Multicast Listener Discovery Protocol
                      Version 2 (MLDv2) for Source-Specific Multicast

RFC4605 PS   Aug 2006    Internet Group Management Protocol (IGMP)/ Multicast
                      Listener Discovery (MLD)-Based Multicast Forwarding (

RFC5186 I    May 2008    Internet Group Management Protocol Version 3 (IGMPv3) /
                      Multicast Listener Discovery Version 2 (MLDv2) and
                      Multicast Routing Protocol Interaction