Design of Logical Topology for IP over WDM Networks: Network Performance vs. Resource Utilization

We consider the problem of designing logical topologies for IP over WDM networks. One important feature of WDM networks is the reconfigurability when traffic demands change over time. However, if the network resource is not used efficiently, the reconfiguration can cause network disruption because new wavelength channels can be added only after deleting some working channels. Therefore, saving resource is an important issue while designing the logical topology. In this paper, we present a new approach to design logical topologies so that the network resource is used the most efficiently while the network performance is still guaranteed. The problem is formulated as a mixed-integer linear programming (MILP).