Avaliação de Desempenho de Protocolos para Multicast com Conhecimento de Grupo baseados em Polling

Marinho BarcellosAndré Detsch

Applications that require control over the membership of a receiving multicast group while data is sent, with gradual positive acknowledgement of receipt, demand the use of protocols with TCP-multicast semantics. This paper shows that reliable multicast transport protocols based on polling are adequate to applications that seek the efficient, reliable and prelatively scalable transmission via Internet to members of a group whose membership the sending application needs to be aware of and control. These requirements are not met by receiver-oriented multicast protocols, because these give priority to scalability over reliability; in contrast, polling-based protocols trade-off some scalability for reliability. This work describes five multicast polling-based protocols and compares them through simulation experiments using a network topology with 451 nodes. The results advocate the efficiency of certain polling protocols in preventing implosion, and show that these protocols can achieve low network cost with high throughput for the group sizes considered. Finally, simulation was used to evaluate the impact of window size and available bandwidth in the protocols throughput.

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