A case for Passive Application Layer Multicast

13 years 4 months ago

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Over the last few years, application-layer multicast (ALM) has emerged as a plausible solution for supporting group-oriented applications. However, ALM suﬀers from ineﬃciency due to its reliance on end hosts and potentially signiﬁcant changes at both the server and client applications. In this paper, we propose an approach, PALM (Passive Application Layer Multicast), that removes the need for changes to the server or client applications while allowing for dynamic discovery of supporting network devices and client-side OS modules. The passive nature of the approach comes from the fact that bandwidth savings occur transparently with zero required modiﬁcations to the networking environment, similar to approaches such as web caching. We demonstrate the performance improvements of PALM relative to ALM and compare the beneﬁts versus network-level multicast and separate unicast approaches through both simulation and experimental studies. Key words: Application Layer Multicast, QoS

Xiaolong Li, Aaron Striegel

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