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Concluded WG Multicast Mobility (multimob)

Note: The data for concluded WGs is occasionally incorrect.

WG Name Multicast Mobility
Acronym multimob
Area Internet Area (int)
State Concluded
Charter charter-ietf-multimob-02 Approved
Document dependencies
Additional resources Issue tracker, Wiki
Personnel Chairs Behcet Sarikaya, Stig Venaas
Area Director Brian Haberman
Mailing list Address
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Final Charter for Working Group

The Multicast mobility (multimob) working group provides guidance
for supporting multicast in a mobile environment. The scope of work
will be limited to Proxy Mobile IPv6, IGMPv3/MLDv2 protocols and
listener mobility. The group will work on extensions of Proxy Mobile
IPv6 to improve its capability to handle multicast efficiently. Work
requiring modifications to IGMPv3/MLDv2 is out of scope in this
stage of this working group, however, as are modifications to
multicast routing protocols.

Specific goals for the group are:

  • A solution to the tunnel convergence problem by separating
    multicast routing from a mobility anchor. Possible techniques are
    using native infrastructure, using a dedicated mobility anchor

  • Mechanisms to optimize multicast traffic during a handover. Such
    mechanisms may include context transfer functionality.

  • Mechanisms needed to support multicast source mobility. Both any
    source multicast and source specific multicast source mobility
    will be covered.

  • Document the configuration of IGMPv3/MLDv2 in mobile environments

The group shall primarily focus on Proxy Mobile IPv6 (PMIPv6) based
networks when looking at the first three items. It is possible but
not required that the solutions are applicable also for Mobile IPv6
(MIPv6) based networks.

For background, the PMIPv6 specification as defined in RFC 5213 does
not describe how to support multicast. Some forms of multicast
support can, however, be built in the involved nodes by using
existing capabilities of multicast protocols and the underlying
mobility protocols. The working group has already documented how
existing mechanisms can be used to support multicast, without
requiring any additions or changes to message types and parameters
specified in RFC 5213, and assuming an unmodified mobile host. The
current goals of the working group relate to improving the
efficiency of this base solution.

IGMPv3/MLDv2 has been specified for wired networks with shared links.
Mobile nodes have needs that are specific to wireless networks and
mobility (e.g. entering a dormant mode to conserve battery power,
minimizing the latency for joining and leaving a group in support of

In performing its work, the working group will work closely with
both the mobility community (NETEXT WG) and the multicast community
(MBONED WG). The group will consider both source specific multicast
and any source multicast multicast models.

Future work, subject to rechartering, may study/evaluate extensions
to IGMPv3/MLDv2 to support better operation in mobile environments.


Date Milestone Associated documents
Dec 2012 Recharter based on the above decisions (or close the group if no new work is needed)
Dec 2012 Decision to include additional optimization work involving extensions to IGMPv3 or MLDv2
Nov 2012 Submit PMIPv6 multicast source mobility solution to IESG for publication as Internet Standard
Nov 2012 Submit PMIPv6 handover optimizations document to IESG for publication as Internet Standard
Jun 2012 Submit PMIPv6 routing optimizations document to IESG for publication as Internet Standard
Nov 2011 Initial version of document on PMIPv6 handover optimizations
Nov 2011 Initial version of document on PMIPv6 multicast source mobility solution
Jun 2011 Initial version of document on PMIPv6 routing optimizations to avoid tunnel convergence problem
Apr 2011 Submit a document on how to tune IGMPv3/MLDv2 for mobility, for publication as either Informational or Best Current Practice
Nov 2010 Initial version of a document on how to tune IGMPv3/MLDv2 for mobility