基于SDN的未来互联网负载均衡策略研究

Research on Future Internet Load Balancing Strategy Based on SDN

SDN基于软件定义,是互联网未来发展的方向。本文针对SDN网络运行中存在的网络流量变化波动较大,可能存在控制器负载不均衡的情况,提出一种基于分布式架构的迁移算法。当控制器集群中出现超负载情况时,通过算法计算出控制器子域内是否有合适的过载域内交换机,该交换机可以迁移至欠载控制器下,从而对控制器的集群完成优化,实现控制器集群内部的流量负载均衡。通过实验得出,优化算法可以有效实现交换机的迁出迁入活动,对互联网的可用性和健壮性有现实意义。

SDN is based on software definition and is the future trend of the Internet development.In this paper,a migration algorithm based on distributed architecture is proposed in view of the large fluctuation of network traffic and the possibility of unbalanced controller load in SDN network operation.When an overload occurs in the controller cluster,an algorithm is used to calculate whether there is a suitable switch in the overload domain within the controller subdomain,which can be migrated to the under-loaded controller,thus completing the optimization of the controller cluster and realize the traffic load balancing within the cluster.It is concluded from experiments that the algorithm can effectively realize the switch migration out and migration in activities,which is of practical significance to the availability and robustness of the Internet.