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In this paper, we study the influence of technology, traffic properties andprice trends on optimized design of a reference IP-over-WDM network with richunderlying fiber topology. In each network node, we investigate the optimaldegree of traffic switching in an optical (lambda) domain versus an electrical(packet) domain, also known as measure of node transparency. This measure isstudied in connection to changes in traffic volume, demand affinity, opticalcircuit speeds and equipment cost. By applying variable design constraints, weassess the relative roles of the two distinct equipment groups, IP routers andoptical cross-connects, with respect to resulting changes in cost-sensitivenetwork architectures.

Optimal Degree of Optical Circuit Switching in IP-over-WDM Networks