A number of multicast applications, including real-time
distributed multimedia applications, require high availability. We study
the problem of multicast
failure recovery in an architecture consisting of the Internet Group Management Protocol (IGMP), which
handles group membership communication between hosts and first-hop routers, and the Protocol Independent Multicast
(PIM) protocol, running over the unicast Open Shortest Path First (OSPF) protocol. Analytical models
are presented to describe the interplay of these protocols in various failure scenarios, involving
routers, links, LAN and WAN. Simulation models are developed using OPNET, to measure the fault recovery time
and the associated protocol
control overhead. The channel failure and recovery times are also measured on a testbed with five Cisco routers.
X. Wang, C. Yu, H. Schulzrinne, P. Stirpe, W. Wu ``IP Multicast Fault Recovery in PIM over OSPF,'' In 8th International Conference on Network Protocols (ICNP'2000), Osaka, Japan, Nov. 2000. Also appears as short paper in International Conference on Measurement and Modeling of Computer Systems (SIGMETRICS'2000), Santa Clara, CA, Jun. 2000.