中文摘要：

随着SDN在大型网络以及广域网中的需求,如何合理、高效地部署SDN控制器,从而以较低的部署成本,获得较好的网络性能,是当前研究的热点.针对控制器数量、部署位置问题以及交换机与控制器之间的映射关系的问题,首先给出一种分布式的控制器部署方式并设定了网络相关参数,以流建立请求代价为优化目标,提出了一种基于贪心算法的控制器部署策略方案.最后通过仿真实验将所提出方案与ACL方案进行对比,证明了所提方案在性能方面有一定的提升.

英文摘要：

With the demand for large-scale network and wide area networks on SDN, how to deploy SDN controllers properly and efficiently to lower deployment costs and get better network performance, is the current research focus. For the issues on number of controllers, the deployment location, and the mapping relations between switch and controller, the paper gives a distributed con- troller deployment model and sets network-related parameters firstly, in order to optimize the flow setup request, a controller de- ployment strategy program based on greedy algorithm has been proposed. Finally, comparing with the existing research programs though the simulation experiments, it shows that the proposed scheme promoting some performance.