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Concluded WG Multicast & Anycast Group Membership (magma)

Note: The data for concluded WGs is occasionally incorrect.

WG Name Multicast & Anycast Group Membership
Acronym magma
Area Internet Area (int)
State Concluded
Charter charter-ietf-magma-01 Approved
Document dependencies
Personnel Chairs Brian Haberman, Isidor Kouvelas
Area Director Jari Arkko
Mailing list Address
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Final Charter for 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

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
    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:

  • Multicast forwarding in tree topologies using IGMP/MLD Proxying

  • Create a single document from:

  • 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.

Done milestones

Date Milestone Associated documents
Done Submit IGMPv3/MLDv2 MIB as Proposed Standard
Done Submit MRD as Proposed Standard
Done Submit Multicast Source Filtering API as Informational
Done Submit SSM considerations for IGMPv3 & MLDv2 as Proposed Standard
Done Submit IGMP & MLD Snooping Considerations as Informational
Done Submit IGMPv3/MLDv2 Interfactions with Routing Protocols as Informational
Done Submit IGMP/MLD Proxying Specification as Proposed Standard