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In two-layer networks there are various ways to improve virtual and physical topology and capacity allocations in terms of cost. One way is introducing bypass links, to reduce the amount of switching in the upper layer. Our approach for finding the bypass links and the corresponding bypass nodes is based on a mixed integer programming approach. Our starting point is a network without bypass functionality...
We propose a linear formulation for traffic routing in optical networks after the virtual topology design (VTD). The formulation maximizes the amount of traffic the network is able to accept, through minimizing the residual capacity in established lightpaths. The results suggest that it is feasible to preserve enough open capacity to avoid disruption of connections and blocking of future traffic demands...
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