------------------ During the first five months, we have done the following: SUPPORTING INTERNET MULTICAST MULTIMEDIA Jon Crowcroft and Peter Kirstein Department of Computer Science University College London 1. Routing We devised a hierarchical protocol independent multicast (PIM) routing mechanism that can be used for the following purposes: a) to deploy the PIM without recourse to algorithms for routing protocol (RP) placement b) to select RPs appropriately, and automatically to distribute multimedia from a session created using the Session Directory Protocol and tool. c) to constrain traffic using policy statements to select route advertisement through filtering d) to deploy IP multicast over ATM multicast through the use of virtual RP hierarchies. This is documented in a paper submitted to the IFIP Protocols for High Speed Networks Conference. [M. Handley and J. Crowcroft: Hierarchical Protocol Independant Multicast]. 2. Reliable Multicast We have devised a specific reliable multicast protocol for use with distributed virtual reality and simulation systems, based on the Scaleable Reliable Multicast transport protocol from the LBL wb too, but with extensions based on accurate clock synchronisation to provide for lower latency (but higher network load) repair. To be presented at the joint UCB/EPFL workshop on Multimedia Networking at Lausanne in July.[J. Crowcroft: Distributed Virtual Reality Multicast Protocol 3. Session and Invitation Protoocols We have completed the Session Directory, and Invitation protocols, together with releases of implementations. [M. Handley: Session Invitation Protoco, ; M. Handley: Session Directory Announcement Protocol, Internet Drafts] 4. Overall Architecture We have Documented the overall Architecture in a paper to be presented at INET 96 [Crowcroft and Handley: The Internet Multimedia Conferencing Architecture]