Some Design Issues of SRMTP, a Scalable Reliable Multicast Transport Protocol
ECMAST '99 Proceedings of the 4th European Conference on Multimedia Applications, Services and Techniques
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Local recovery approaches for reliable multicast have the potential to provide significant performance gains in terms of reduced bandwidth and delay, and higher system throughput. In this report we examine one server--based and two receiver--based approaches, and compare their performance. The server--based approach makes use of specially designated hosts, called repair servers, co--located with routers inside the network. In the receiver-based approach, only the end hosts (sender and receivers) are involved in error recovery. Using analytical models, we first show that the three local recovery approaches yield significantly higher protocol throughput and lower bandwidth usage than an approach that does not use local recovery. Next, we demonstrate that server--based local recovery yields higher protocol throughput and lower bandwidth usage than receiver--based local recovery when the repair servers have processing power slightly higher than that of a receiver and a few hundred kilobytes of buffer per multicast session.