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An IP (Internet Protocol) over WDM network is expected to be an infrastructure for the next-generation Internet by directly carrying IP packets on the WDM-based network.Among several architectures for IP over WDM networks, one promising way is to overlay a logical topol- ogy consisting of lightpaths over the physical WDM network, so that IP packets are carried using the lightpaths.The conventional design meth- ods of the logical topology have been focusing on maximizing through- put of the traffic.However, when the WDM network is applied to IP, the end-to-end paths provided by the logical topology of the WDM net- work is not suitable to IP routing since IP has its own metrics for route selection.We therefore propose a new heuristic algorithm to design a logical topology by considering the delay between nodes as an objective metric.We use a non-bifurcated flow deviation method to obtain a set of routes that IP packets are expected to traverse.Our proposal is then compared with conventional methods in terms of the average packet

A Design Method of Logical Topology for IP Over WDM Networks with Stable Routing