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In this paper, overlay multicast is studied in depth. Taking into account the advantage of the mesh structure, the authors propose an overlay multicast protocol suitable for the transmission of real-time multimedia, which can transcend the tree structure. This protocol optimizes the structure of multicast tree in order to make full use of each node to enhance the transmission ability of data, instead of exploiting the inner nodes of the tree, which can improve the usability of network resource and enhance the robusticity and effectivity. Furthermore, they perform a series of simulation experiments. Experimental evaluation shows that their protocol can effectively solve the problem of single point of failure and have better fault tolerance and higher scalability.
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