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BIDIR-SAM: Large-Scale Content Distribution in Structured Overlay Networks

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Executive Summary

IPTV, software replication and other large-scale distribution tasks urge the need for efficient multicast mechanisms in overlay networks. Current multicast solutions on the application layer are efficient, structured, but inflexible, or flexible, unstructured, but of lesser efficiency. This paper introduces Scalable Adaptive Multicast on BI-DIRectional shared trees, a new structured but flexible approach to content distribution. BIDIRSAM is the first DHT-based overlay multicast that distributes any source multicast data according to source-specific shortest path trees. Built upon bi-directional shared prefix trees, the approach distributes packets uniquely via fully redundant paths, and allows for highly flexible network adaptivity.

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