EFFICIENT DYNAMIC ROUTING AND SPECTRUM ASSIGNMENT FOR DISTRIBUTED MULTI-DOMAIN SOFTWARE-DEFINED ELASTIC OPTICAL NETWORKS

Abstract

In this paper, we propose an efficient dynamic routing and spectrum assignment algorithm for dynamic distributed multi-domain software-defined elastic optical networks. In our work, rather than the deployment of an SDN orchestrator on top of all the controllers, we adopt a distributed control approach where domain controllers communicate with each other to establish/release inter-domain lightpath requests. The developed algorithm also employs breadth first search algorithm for routing and spectral fragmentation-aware assignment technique to find the suitable spectrum resources along the selected route. Numerical experiments demonstrate that the proposed control scheme enhances the network performance significantly comparing with the conventional GMPLS/PCE scheme; it offers up to 64.66% blocking probability reduction.