Multi-Threshold SDN Controllers Load Balancing Algorithm Based On Controller Load

Abstract

SDN (Software-Defined Networking) centralized control features make it suffer from performance bottlenecks and therefore need to be overcome using a distributed control plane. However, the imbalanced load among multiple controllers will also lead to a decrease in overall system performance. In order to solve the conflict between inefficient nodes and overloaded nodes, a more efficient and flexible load balancing algorithm is needed to ensure the efficient operation of the SDN network. The algorithm firstly accurately selects the controller load description parameters, then uses multiple thresholds to distinguish the controller status, and at the same time more effectively selects the switch to migrate to the idle controller. The algorithm determines the state of the controller more precisely while trying to make each controller work in the normal mode, to avoid the controller in a long period of high load mode. The experimental results show that the algorithm can effectively improve the load balancing degree and throughput recovery speed of SDN control plane.