Multicast & Anycast Group Membership (magma)

NOTE: This charter is a snapshot of the . It may now be out-of-date.

Last Modified: 2006-04-18

Chair(s):

Isidor Kouvelas <kouvelas@cisco.com>
Brian Haberman <brian@innovationslab.net>

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:

  • draft-ietf-magma-igmpv3-and-routing-05.txt
  • draft-ietf-magma-mgmd-mib-11.txt

    Request For Comments:

    RFCStatusTitle
    RFC3228 BCP IANA Considerations for IGMP
    RFC3590 PS Source Address Selection for the Multicast Listener Discovery (MLD) Protocol
    RFC3678 I Socket Interface Extensions for Multicast Source Filters
    RFC3810 Standard Multicast Listener Discovery Version 2 (MLDv2) for IPv6
    RFC4286 Standard Multicast Router Discovery
    RFC4541 I Considerations for Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Snooping Switches
    RFC4604 PS Using Internet Group Management Protocol Version 3 (IGMPv3) and Multicast Listener Discovery Protocol Version 2 (MLDv2) for Source-Specific Multicast
    RFC4605 PS Internet Group Management Protocol (IGMP)/ Multicast Listener Discovery (MLD)-Based Multicast Forwarding (