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This paper proposes a new energy management framework for an IP over WDM network. A key constraint of the authors' architecture is to maintain the logical IP topology while saving energy by infrastructure sleeping and virtual router migration. Since the traffic in a network typically has a regular diurnal pattern based on people's activities, some virtual routers can be moved to a smaller set of physical router platforms so that the unused physical platforms can be switched off when the traffic demand is light. As the traffic demand increases the sleeping physical router platforms can be re-awoken and the virtual router functionality returned to the original physical platforms close to where the traffic load is rising.
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