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In Application layer multicast (ALM) also called Overlay Multicast,multicast-related functionalities are moved to end-hosts. The key advantages,overlays offers, are flexibility, adaptability and ease of deployment [1].Application layer multicast builds a peer-to-peer (P2P) overlay multicast treetopology consisting of end-to-end unicast connections between end-hosts. Endusers self organize themselves into logical overlay networks for efficient datadelivery. Major concern in designing ALM protocol is how to build and maintaina topology, to route data efficiently and reliably. We propose here a scheme inwhich the topology is built incrementally while maintaining dual feeds of themedia stream to any node from the source with minimum differential delay inreceiving packets from both alternatives. We have made the assumption ofavailability of a P2P query search network. This enables building of multicasttree directly as an overlay. There is no need of maintaining an overlaid meshand running multicast routing protocol to maintain a multicast tree in thismesh. Thus the scheme is much more simplified than in the earlier work onmulticast overlay mesh creation and management and then creation and managementof multicast trees using this mesh.

Multipath Approach for Reliability in Query Network based Overlaid Multicasting