关键词: 软件定义网络, 分层式控制器, 负载阈值, 迁移, 负载均衡

Abstract: Abstract: Aiming at the problem that the communication overhead between the controllers is large and the controller throughput is low during the load balancing process of SDN multi-controller, a hierarchical controller load balancing mechanism is proposed. Based on the hierarchical architecture, through the collaboration of the super controller and domain controller to complete the load balancing, and the use of predefined load threshold to reduce the message exchange overhead between the domain controller and the super controller;At the same time, the mechanism can effectively select the most overloaded domain controller and select the switch that conforms to the migration standard among the switches which controlled by the most overload domain controller and migrates it to a controller with a high overall performance to solve the problem of load imbalance between multiple controllers. Experiments show that compared with the COLBAS algorithm and the DALB algorithm, the number of messages in the system is reduced by about 21%, and the throughput of the system is better than COLBAS and DALB. This mechanism effectively reduces the communication overhead and improves the resource utilization of the controller to achieve a better load balancing effect.

Key words: software defined network, hierarchical controller, load threshold, migrate, load balancing