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在基于多生成树协议的城域以太网快速故障恢复机制中,为了表示单链路故障情况下网络延时的变化,该文提出了单链路故障下平均延时的概念,并且在修改现有单链路故障恢复树构建算法的基础上,提出利用分布式切换减小单链路故障下平均延时。分布式切换的基本思想是,发生故障后,各节点尽可能多地使用平均延时较小的蓝树上的路径和根节点相连,而不是将到根节点的整条路径完全切换到没有延时保证的红树上。仿真结果表明,分布式切换能够明显减小单链路故障下平均延时。
In the metro Ethernet fast failover mechanism based on multi-spanning tree protocol, in order to show the change of network delay under single link failure, this paper proposes the concept of average delay under single-link failure, Based on the single-link fault recovery tree construction algorithm, it is proposed to reduce the average delay under single-link failure by using distributed switching. The basic idea of distributed switching is that, after a failure, each node uses as many paths as possible on the blue-tree with smaller average delay to connect with the root node instead of completely switching the entire path to the root node to no delay Mangrove tree on time. Simulation results show that distributed switching can significantly reduce the average delay under a single link failure.