Ciena Corporation
Systems and methods for constrained path computation in networks with connectivity and resource availability rules

Abstract:

Systems and methods for constrained path computation in networks with connectivity and resource availability rules build the necessary constraints directly into the routing graph so that all paths found are by construction satisfying of all the constraints. This is in contrast to the conventional approach of finding multiple paths and then applying the constraints. The present disclosure efficiently addresses the necessary constraints in the routing graph. Path Computation Engine (PCE) performance in terms of time to return acceptable paths to the user generically degrades as network scale (typically expressed through length and number of paths) increases. The present disclosure keeps the input graph small even though the graphs have expanded functionality to address constraints.