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The authors propose a fast reroute scheme for the single link failure protection of IP multicast network. A multicast network connects nodes as a spanning tree, which is vulnerable to link failures. Their scheme uses ring topologies to ensure a backup path always exists to any single link failure and only a few nodes in the neighborhood of the failed link have to react to the failure. Compare to other solutions, they have four advantages: the multicast tree can be arbitrary, there is only a minimal disruption and there would be no packet loss, failure protection is available to a wider set of network topologies, and only a small number of multicast nodes are involved and the number of spare links used are also small.
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