软件定义网络分布式控制信道构建协议

Distributed Protocol of Control Channel Construction in Software Defined Networks

软件定义网络中控制层和数据层的分离可以实现对物理上分散的控制器进行逻辑上的集中管理,从而具有良好的扩展性能.为实现软件定义网络的高效管理,提出一种分布式控制信道构建协议.协议中各控制器执行自身的管理任务.控制器发起网络拓扑发现过程,根据发现的局部网络拓扑创建以控制器为根,具有最小延迟的树形控制拓扑,进而形成控制层.由于协议采用异步工作方式,所以无需进行网络全局初始化,也无需全局网络信息.经过协议分析和实验验证,提出的协议能够应用于大规模软件定义网络,并具有较好的时间和扩展性.

The separation of control layer and data layer in software defined networking provides a wide space for the promotion of scalability.In order to manage the network state of SDN,a distributed resource discovery protocol was proposed.The protocol distributes the network management task for network controllers.Each controller sponsors the procedure of network topology discovery.And according to discovered topology,data nodes join the management of controllers by searching delay shortest path.Thus,minimum latency trees rooted by controllers were constructed.The protocol is working at asynchronous mode since it not need global initialization process and global networking information.Analysis and simulation resultdemonstrate that the protocol achieves preferabletime and overheadperformance,therefore,it can be utilized in SDN.