Multicast Mobility (multimob) Chairs: Suresh Krishnan Behcet Sarikaya Internet Area (int) Directors: Jari Arkko Mark Townsley Internet Area Advisor: Thomas C. Schmidt . Security Area Advisor: Marshall Eubanks . Mailing Lists: General Discussion: multimob@ietf.org Subscribe online at: https://www1.ietf.org/mailman/listinfo/multimob Description of Working Group IP multicasting technology started to be used in mobile networks and this trend is expected to continue. Multicast mobility (multimob) proposes to deal with the problems, inefficiencies that arise from using IP multicasting in mobile environments. The scope will be limited to the group management and unicast mobility protocols. Both source specific multicast (SSM) and any source multicasting will be considered. Work related to and requiring modifications to multicast routing protocols (PIM-SM, PIM-DM, etc.) is out of scope. Both IPv4 and IPv6 versions of the solutions will be developed in the same or separate documents. IGMPv3/MLDv2 is originally defined for wired networks with shared links. Also mobile nodes have to save battery by entering into the dormant mode. Therefore dormant mode operation needs to be supported by IGMPv3/MLDv2. There are also concerns related to the latency of joins and leaves that IGMPv3/MLDv2 provides. The latency needs to be minimized. There are currently deployed extensions to reduce the join and leave latencies. In Multimob these issues will be addressed and IGMPv3/MLDv2 for mobile environments will be standardized. Different strategies for solving these issues will be pursued. The simplest strategy would be documenting already implemented and deployed fast join/fast leave extensions. The WG needs to ascertain whether the existing solutions are sufficient to solve this problem, and if not, come up with better solutions. For supporting dormant mode, the WG needs to define protocol changes that may simply modify the timers in the protocols or support additional message types. Base mobility protocol Mobile IPv6 (MIPv6) and its extension Dual-Stack Mobile IPv6 (DSMIPv6) support multicasting at a minimum level called remote-subscription. Remote-subscription makes mobile node's mobility transparent to the multicast tree. However, bidirectional tunneling used introduces several non-optimalities that will be addressed in Multimob. Several extensions and improvements will be developed to MIPv6. MIPv6 solution will be extended in order to support multicast mobility for DSMIPv6. Since DSMIPv6 supports IPv4, multicast mobility extension will also support IPv4. Proxy Mobile IPv6 (PMIPv6) on the other hand does not currently support multicasting. PMIPv6 will be extended to support multicasting. The extension will also support IPv4. It is a goal of the new working group to enhance the base mobility protocols MIPv6, DSMIPv6 and PMIPv6 to render these protocols more deployable in new and upcoming Mobile IPTV networks. IGMPv3/MLDv2 will be extended to support host mobility. Mobile IGMPv3/MLDv2 featuring reduced join and leave latencies, dormant mode and point-to-point link support will be standardized. The base protocol MIPv6 handles multicast sessions of a mobile node if the mobile node uses its home address in multicast group subscriptions. Bandwidth inefficiency inherent in bidirectional tunneling will be addressed for MIPv6 and DSMIPv6. Multicast support will be added to PMIPv6 as an integrated solution. In doing its work, the Multimob working group will work closely with MEXT and NETLMM working groups and will coordinate IGMP/MLD extensions work with MBONED working group. GOALS AND MILESTONES June 2009 Multicast mobility problem statement to the IESG December 2009 IGMPv3/MLDv2 Extensions document as proposed standard to IESG February 2010 Multicast tunneling optimization for MIPv6 solution document as proposed standard to IESG March 2010 Multicast extension for DSMIPv6 solution document to IESG July 2010 PMIPv6 Extensions document as proposed standard to IESG Recharter or close working group