Minimum Cost Load Migration in Distributed Software Defined Networks

Abstract

Software defined networking is a network paradigm which separates the control plane and the data plane. In a large SDN network, multiple controllers are used for handling switches’ requests. Because of the unbalanced requests, sometimes some controllers get overloaded. If switch’s management can be shifted from the overloaded controller to idle controllers, network performance can be improved. But shifting the switches will bring cost to the system. In this paper, the isolation nodes problem is studied. A minimum cost load migration approach and a heuristic migration algorithm are proposed. The proposed load migration approach can avoid the isolation nodes. The simulation results show that the proposed approach enhances the system performance.