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The problem of light-path provisioning in WDM optical networks has been extensively studied to reduce cost and blocking, but there is still a need of investigating this problem from a power consumption perspective. In this paper, the authors introduce a novel algorithm for IP/MPLS over WDM networks based on a reduced auxiliary graph that limits the solution space and captures the power consumption of light-path provisioning. Results derived via simulation demonstrate that their strategy is energy efficient and that it is able to produce acceptable blocking ratio which are close to values produced by algorithms oriented to the reduction of blocking.
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