基于时延优化的SDN层次式多控制器部署

Software Defined Networking(SDN) decouples the control plane from the data plane and provide logically centralized control through controller. The controller placement directly impacts performance of control plane which responsible for handing the network events. In this paper, an algorithm is proposed to minimize the average switch request latency in hierarchical multi-controller placement. The proposed algorithm introduces the clustering method to partition the network and uses genetic-based algorithm to find the best controller placement. Simulation results show that the proposed algorithm can remarkably reduce the average switch request latency compared with other traditional methods.