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The Dissertation Defense for the Ph.D. Degree in Computer Science for

    			   GEORGE APOSTOLOPOULOS

    will be held on 	    Friday August 13, 1999
			    A. V. Williams Building, Room 3258 at 9.00
			    a.m.

    Title of Dissertation:  Cost and Performance of Quality of Service
			    Routing

    Abstract: Path selection that is sensitive to network
resource availability,
also known as QoS routing or constrained based routing, has recently
received a lot of attention due to its potential for improving network
performance and supporting emerging network operating environments.
In our work we attempt to investigate the overhead that QoS routing will
incur on the network infrastructure, i.e., increased processing
requirements
at the routers. A good understanding of the overheads of QoS routing will
allow us to evaluate its feasibility in a variety of realistic network
environments. In addition to simulation, the evaluation of the cost of QoS
routing also uses experimental measurements of an actual implementation of
a link state QoS routing protocol.  

In the first part of our work we investigate in detail the cost of QoS
routing for various configurations of the routing protocol.  Then we study
methods for reducing the volume of updates (and consequently the cost of
QoS routing) and their effects on the routing performance.  In the second
part, we show effective techniques for achieving improved routing
performance with low update traffic volumes. Finally, we investigate the
feasibility and benefits of alternative QoS routing architectures, in
particular server based QoS routing


    Examinine Committee:    Dr. Satish K. Tripathi, Chair
		            Dr. Leandros Tassiulas, University Rep 
			    Dr. Ashok Agrawala
			    Dr. Pete Keleher
			    Dr. Leana Golubchik

	     MEMBERS OF THE GRADUATE FACULTY ARE INVITED TO ATTEND.