Stanford Distributed Systems Seminar

12:45 PM, April 5, 2000
Room 150, McCullough Building

Scalable Multi-Source Multicast Sessions in a Single-Source Multicast Network

Vince Laviano
Stanford University

About the talk:

IP multicast still faces considerable address allocation and scalability challenges a decade after its inception, inhibiting the deployment of large-scale multimedia applications such as Internet TV. Explicitly-Requested Single-Source (EXPRESS) multicast is a recent proposal that addresses many of these issues, but it removes multi-source multicast primitives from the network layer. Many multicast applications are multi-source, even those that logically have a single sender (because of the use of RTCP), and thus are not directly supported by the EXPRESS model.

The premise of this work is that large-scale multi-source multicast sessions can be supported efficiently in a network with only single-source multicast primitives, through the use of application-level relays. These relays subsume the functionality of network-level rendezvous points and, since they exist at the application layer, application-level knowledge can be used to: determine the placement of relays on a per-session basis, determine the specific relay(s) to be used on a per-client basis, and allow relay points to enforce dynamic floor control decisions.

About the speaker:

Vince Laviano is a Ph.D. candidate in computer science at Stanford University. He is a member of the Stanford Distributed Systems Group, led by Prof. David Cheriton. Vince earned B.S. and M.S. degrees in computer science from George Mason University in 1995 and 1997 respectively. His research interests span networks, operating systems, and distributed systems. Recently, he has been focusing on single-source IP multicast routing and application-level support for traditional multi-source multicast in such an environment.