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Application-level multicast is a promising alternative to IP multicast due to its independence to the IP routing infrastructure and its flexibility in constructing the delivery trees. The existing overlay multicast systems either support a single data source or have high maintenance overhead when multiple sources are allowed. They are inefficient for applications that require any-source multicast with varied host capacities and dynamic membership. This paper proposes ACOM, an any-source overlay multicast system, consisting of three distributed multicast algorithms on top of a non-DHT overlay network with simple structures (random overlay with a non-DHT ring) that are easy to manage as nodes join and depart. The nodes have different capacities, and they can support different numbers of direct children during a multicast session. No explicit multicast trees are maintained on top of the overlay. The distributed execution of the algorithms naturally defines an implicit, roughly-balanced, capacity-constrained multicast tree for each source node. We prove that the system can deliver a multicast message from any source to all nodes in expected O(logc n) hops, which is asymptotically optimal, where c is the average node capacity and n is the number of members in a multicast group.
Any-Source Overlay Multicast, Peer-to-Peer Networks, Distributed Multicast Algorithms

S. Chen, B. Shi and S. Chen, "ACOM: Any-source Capacity-constrained Overlay Multicast in Non-DHT P2P Networks," in IEEE Transactions on Parallel & Distributed Systems, vol. 18, no. , pp. 1188-1201, 2007.
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