Note the unusual time

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                   B O S T O N   U N I V E R S I T Y
                      Computer Science Department
                          C O L L O Q U I U M
                     Wednesday, December 11, 11:00 AM
                       (Coffee served at 10:45 AM)
                         Seminar Room / MCS 135

             Improving Scalability in Source-Based Multicast

                                Whay C. Lee
                               Motorola Labs

Multicast is an efficient tree-based method for point-to-multipoint
communications.  Each router in a multicast domain is required to
maintain forwarding states for every multicast delivery tree traversing
the router.  In this respect, the complexity of a multicast protocol
increases with the number of multicast delivery trees.   For the sake of
scalability, a multicast delivery tree may be shared by all sources in a
multicast group, and even sources belonging to multiple multicast
groups.  However, such reduction in multicast complexity opens up a
number of performance issues, including path length compromise, traffic
concentration, leaky forwarding, and inadequate handling of dynamic
group membership.   While source-based multicast delivery trees maintain
their appeal in terms of these performance issues, there exists no
method that explicitly minimizes multicast forwarding states in the
routers, except in the case where tunneling is used over non-branching
paths.  In this talk, I will present a method for minimizing multicast
forwarding states in routers belonging to a source-based multicast
domain.  This method maximizes overlapping of the source-rooted
shortest-path trees used for each multicast group and compresses the
content of forwarding caches to remove redundancy.  

Biography:

Whay Lee holds several degrees from MIT, including a Ph.D. degree in
Electrical Engineering and an S.B. degree in Economics.  He is currently
a Distinguished Member of Technical Staff in the Broadband Networks
Research Lab of Motorola Labs.  In the years he has been with Motorola,
he was involved in a wide range of applied research in communication
networks and systems, including quality of service, active queue
management, medium access control, bridging, routing, etc.  He was a key
contributor in the specification of PNNI 1.0 for ATM and the
specification of the MAC layer for IEEE 802.14 CATV protocol.  Today,
Whay leads and manages research activities in various areas of
QoS-enabled broadband wireline/wireless networking infrastructures.  He
holds 13 U.S. patents, and has been a senior member of the IEEE since
1998.  Whay has supervised research of graduate students from Boston
University, Northeastern University, UIUC, and MIT through a variety of
university and industrial partnership programs.

Host: Ibrahim Matta

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