Multicast & Anycast Group Membership (magma)

Last Modified: 2006-04-18

Additional information is available at tools.ietf.org/wg/magma

Chair(s):

  • Brian Haberman <brian@innovationslab.net>

  • Isidor Kouvelas <kouvelas@cisco.com>

    Internet Area Director(s):

  • Jari Arkko <jari.arkko@piuha.net>
  • Mark Townsley <townsley@cisco.com>

    Internet Area Advisor:

  • Jari Arkko <jari.arkko@piuha.net>

    Mailing Lists:

    General Discussion: magma@ietf.org
    To Subscribe: magma-request@ietf.org
    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:

    IGMPv3/MLDv2 and Multicast Routing Protocol Interaction (13101 bytes)
    Multicast Group Membership Discovery MIB (74060 bytes)

    Request For Comments:

    IANA Considerations for IGMP (RFC 3228) (6473 bytes)
    Source Address Selection for the Multicast Listener Discovery (MLD) Protocol (RFC 3590) (11554 bytes) updates RFC 2710
    Socket Interface Extensions for Multicast Source Filters (RFC 3678) (36320 bytes)
    Multicast Listener Discovery Version 2 (MLDv2) for IPv6 (RFC 3810) (153579 bytes) updates RFC 2710/ updated by RFC 4604
    Multicast Router Discovery (RFC 4286) (35540 bytes)
    Considerations for Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Snooping Switches (RFC 4541) (38555 bytes)
    Using Internet Group Management Protocol Version 3 (IGMPv3) and Multicast Listener Discovery Protocol Version 2 (MLDv2) for Source-Specific Multicast (RFC 4604) (23370 bytes) updates RFC 3810,RFC 3376
    Internet Group Management Protocol (IGMP)/ Multicast Listener Discovery (MLD)-Based Multicast Forwarding ( (RFC 4605) (25558 bytes)
    IETF Secretariat - Please send questions, comments, and/or suggestions to ietf-web@ietf.org.

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