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On a router-port basis, the authors' previous study found that lightpath bypass strategy can significantly save power consumption over the lightpath non-bypass strategy. However, in real network systems, router ports are organized by network line cards or modules; on each line card there are multiple router ports. In this paper, they evaluate the energy consumption of an IP over WDM network in the context of modularized router ports. They develop Mixed Integer Linear Programming (MILP) model for power consumption minimization under the lightpath bypass strategy.
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