IP Multicast Fault Recovery in PIM over OSPF Xin Wang, C. Yu, Henning Schulzrinne Department of Computer Science Columbia. University New York, NY 10027 {xinwang, hgs} @cs.columbia.edu Paul Stirpe, Wei Wu Reuters 88 Parkway Drive South Hauppuage, New York 11788 {panl.stirpe, wei.wu} @reuters.com 1. INTRODUCTION Many IP multicast applications, for example, near real-time dissemination of financial, information, require high availability. This problem has not received much attention so far. In this paper [1], we investigate a complete multicast routing architecture consisting of IGMP [2] for multicast group membership management in a LAN, OSPF [3] for unicast routing, and PIM sparse-mode [4] and PIM dense-mode [5] for multicast routing. We restrict our attention to the single link and router faults inside the network, and assume that sending and receiving hosts, their LANs are reliable. Since fault recovery associated with rendezvous point (RP) faihires in PIM SM have been studied extensively [4], this paper focuses on other mechanisms (router, link, LAN, WAN fail-over) that are not sufficiently addressed and are less well understood by the community. Analytical models are presented to describe the interplay of all of the component protocols in various multicast channel recovery scenarios. Quantitative results for the
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