Abstract
We propose a linear formulation and an iterative heuristic for the Logical Topology Design (LTD) in optical networks. The formulation maximizes the number of remaining available routes, trying to preserve the open capacity for the accommodation of future unknown demands. The heuristic routes foreseen traffic through the previously set up routes and also the remaining dark lightpaths. The results suggest that it is feasible to preserve enough open capacity to avoid blocking of future requests in networks with scarce resources.
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