软件定义网络的可靠性评估与优化机制

Software-Defined Network (SDN) has become a trend in next generation network with development of network. In SDN, under the tight controlling of controllers, switches lost the ability to tell good from bad of commands from controllers. It will lead to botnet or other risks when controllers are unsecure. And to the controllers, if they unconditionally receive any switches into their control fields, the hazardous switches that creep in the controllers' control fields will injure these controllers and the switches in the same control fields. We propose an optimization algorithm based on the hierarchical SDN. In this structure switches can choose their controllers, and controllers can also choose the secure switches. Our algorithm is designed to help make two-way choice between controllers and switches based on their security. Finally this algorithm can make the system get the secure linking model.In this paper, we propose a algorithm to make the system more reliable. A dynamic algorithm is proposed to arrange the system according to the real time data. And we can use cooperatively this algorithm in the variable links SDN to keep the system safe and reliable.