SDN网络中基于拓扑分域的故障恢复方法

Failover method based on topology subarea in SDN network

为解决网络故障恢复期间的反应时间过长的问题,将软件定义网络(software defined networking,SDN)网络架构引入到网络故障恢复的策略设计中,对比现有故障恢复领域研究的优势和不足,提出一种基于SDN的故障恢复方法。通过对整网拓扑结构进行分域,采用无向图环路算法(undirected graph loop algorithm,UGLA)计算当前网络拓扑中的所有环路;根据UGLA,设计链路评估方法,选择最优故障备份转发路径转发数据流量。故障恢复实验数据的分析结果表明,该方法可提高交换机流表匹配效率,减少故障恢复时间,保障业务的带宽需求和服务质量。

To solve the problem of long response time during network fault recovery,SDN(software defined networking)network architecture was introduced into the strategy design of network fault recovery.Comparing the advantages of existing achievements and disadvantages of different methods,a kind of failure recovery method based on SDN was proposed.After divi-ding the whole network topology into different domains,the UGLA(undirected graph loop algorithm)was used to calculate all loops in the current network topology,the optimal fault backup forwarding path was selected to forward the data flow.The analysis results of fault recovery experiment data show that the proposed method can improve the efficiency of switch flow table matching,reduce the time of fault recovery,and guarantee the bandwidth demand and service quality of services.