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DATE: Thursday, August 23, 2001 TIME: Noon - 1 pm PLACE: Wean Hall 8220 SPEAKER:
TITLE: Enabling Conferencing Applications
on the Internet using an Overlay ABSTRACT: In response to the serious scalability and deployment concerns with IP Multicast, we and other researchers have advocated an alternate architecture for supporting group communication applications over the Internet where all multicast functionality is pushed to the edge. We refer to such an architecture as End System Multicast. While End System Multicast has several potential advantages, a key concern is the performance penalty associated with such a design. While preliminary simulation results conducted in static environments are promising, they have yet to consider the challenging performance requirements of real world applications in a dynamic and heterogeneous Internet environment. In this talk, we explore how Internet environments and application requirements
can influence End System Multicast design. We explore these issues in
the context of audio and video conferencing: an important class of applications
with stringent performance requirements. We conduct an extensive evaluation
study of schemes for constructing overlay networks on a wide-area test-bed
of about twenty hosts distributed around the Internet. Our results demonstrate
that it is important to adapt to both latency and bandwidth while constructing
overlays optimized for conferencing applications. Further, when relatively
simple techniques are incorporated into current self-organizing protocols
to enable dynamic adaptation to latency and bandwidth, the performance
benefits are significant. Our results indicate that End System Multicast
is a BIO: Yang-hua Chu is a 4th year Ph.D. student in Computer Science at Carnegie Mellon University. His current research is on overlay network and multicast service for Internet applications. For
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