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针对软件定义网络(software defined network,SDN)中复杂的中央控制器、可定制路由和不同资源的共享问题,提出了一种控制器-交换机延迟最小化嵌入(delay minimizing embedding,DME)结合压力平衡嵌入(stress balancing imbedding,SBE)的SDN虚拟映射方法。首先,利用压力平衡嵌入平衡底层组件的负载压力同时保持控制器与交换机之间的延迟位于一定范围内;然后,最小化控制器与交换机之间的延迟,并限制底层组件间的负载;最后,根据负载均衡改进节点和链路负载,对控制器进行网络流量隔离以实现SDN的安全控制。实验结果表明,相比DME和SBE方法,方法在控制器-交换机延迟、网络吞吐量和端到端延迟方面均取得了更好的性能。
Aiming at the complicated central controller in software defined network (SDN), we can customize routing and sharing of different resources. We propose a controller-switch delay minimizing embedding (DME) combined with pressure balancing SDN virtual mapping method of stress balancing imbedding (SBE). First, the pressure balance is used to balance the load pressure of the underlying components while keeping the delay between the controller and the switch within a certain range. Then, the delay between the controller and the switch is minimized and the load between the underlying components is limited. Finally, Improve node and link load based on load balancing to isolate network traffic of controllers for SDN security control. The experimental results show that the proposed method achieves better performance in controller-switch delay, network throughput and end-to-end delay than DME and SBE methods.