抗毁SDN光网络资源优化调度研究

Research on optimal scheduling of SDN optical network resources

以往所使用的双边策略优化方法,对抗毁SDN光网络资源进行调度时链路保护容量过高,不能进行微时隙网络数据分配,容易出现丢帧、重传问题,资源调度阻塞率高、保护效率低。因此,提出抗毁SDN光网络资源优化调度方法,其选取网状拓扑构架,以其专用保护和共享保护两种方式为基础,设计出部分共享路径保护方案。在该保护方案下采用抗毁SDN光网络的链路保护方法,构建光网络链路线性规划模型,基于该模型采用Cplex软件使光网络链路保护容量最小化、工作流量最大化,并通过链路失效检测软件实现链路失效检测。在链路保护容量最小化以及正常链路情况下,将资源调度按层次划分形成资源调度树后,进行微时隙数重组的网络资源优化调度。实验结果表明:所提资源优化调度方法的资源调度阻塞率低,保护效率高,可提高光网络的吞吐量。

The bilateral strategy optimization method used in the past is very high in link protection capacity when scheduling against SDN optical network resources, and can not distribute data in micro slot network. It is prone to lose frame and retransmit. The resource scheduling has high blocking rate and low protection efficiency. Therefore, a resource optimization scheduling method of SDN optical network is proposed , which selects the mesh topology structure. Based on the two ways of dedicated protection and sharing protection, a partial shared path protection scheme is designed. Link protection method for survivable SDN optical network is used in the protection scheme, construction of optical network link linear programming model, this model uses the Cplex software to make optical network link protection capacity minimization, work flow based on the maximum, and through the link failure detection software link failure detection. Under the condition of link protection capacity minimization and normal link, resource scheduling is hierarchically divided into resource scheduling tree, and then network resource optimization scheduling with micro slot number reorganization is carried out. The experimental results show that the resource scheduling method has low congestion rate and high protection efficiency, and can improve the throughput of optical network.