一种SDN中基于SR的多故障恢复与规避机制

摘要

Considering the multi-fault problem in Software-Defined Network (SDN),a segment routing based multi-fault recovery and re-breakdown avoidance mechanism is proposed.In order to achieve fast recovery of failures,a linkageloop backup system aiming at fast recovery for multi-fault problem is proposed with SR technology in dataplane.To avoid second failure caused by breakdown in some links due to the overload problem in failure recovery,an optimal traffic smoothing algorithm is proposed to balance the traffic among links where the traffic goes beyond the threshold.Experiments result show that compared with the schemes OAM-Based and Fast Failover,the proposed scheme improves the success rate of failure recovery by 6.7％ and 8.5％,and the cost in controller is only 9％ of the traditional OpenFlow scheme.At the same time,the proposed scheme also deals with the overload problem in failure recovery,which protects the network in failure avoidance scope.%针对SDN中的多故障恢复问题,提出了一种基于分段路由的多故障恢复与规避机制.为实现故障的快速恢复,在数据平面通过SR技术预部署一个可对多故障提供快速恢复能力的链路环备份系统;为防止故障恢复时造成部分链路负载过重引发再故障,提出最优化流量平滑算法对负载超过设定阈值的链路实施流量均衡处理.实验结果表明,与已有的SDN多故障恢复机制OAM-Based和Fast Failover相比,所提机制的平均故障恢复成功率分别提高了6.7％和8.5％,且控制器通信开销仅为传统OpenFlow方案的9％,同时,所提机制对故障恢复时导致的链路负载过重问题进行了处理,从故障规避的角度为网络提供保护.