融合环回和源路由的MPLS-TP网络高效环保护方法

Efficient ring protection for MPLS-TP networks based on merging wrapping and steering

环回和源路由是多协议标签交换-传输应用(multi-protocol label switching transport profile,MPLS-TP)网络环保护的2种基本方式,融合它们有利于减少丢包和降低数据时延。针对目前融合二者的方法在控制分组传输路径和倒换时延方面存在冗余的问题,提出一种新的环保护方法—高效的环回和源路由网络环保护(efficient wrapping and steering,EWAS),通过精简控制分组传输路径消除路径冗余,降低控制分组传送开销和倒换时延,并使中间节点自动倒换数据传送通路以减少数据分组转发次数。理论分析验证了新方法的有效性,仿真结果显示,与环回、源路由和环回和源路由网络环保护(wrapping and steering,WAS)方法相比,EWAS的控制开销和倒换时延分别降低20.55%和15.18%以上。

Wrapping and Steering are two basic ring protection methods for MPLS-TP（ Multi-Protocol Label Switching Transport Profile） networks. Merging them can help to reduce the loss and delay of data packets. But the existing merging methods contain redundancy in the transmission paths of control packets and the switch delay. To address the problem,a novel ring protection method,EWAS（ Efficient Wrapping and Steering）,is proposed. EWAS decreases the path redundancy by simplifying the path of control packets,thus reducing the control overhead and the switch delay. Moreover,EWAS lets the intermediate nodes automatically switch paths of data packets so as to reduce the times of forwarding data packets.Theoretical analysis verifies the effectiveness of EWAS. Simulation results show that EWAS decreases the control overhead and the switch delay by more than 20. 55% and 15. 18%,respectively,as compared with Wrapping,Steering,and WAS.