中文摘要：

为了克服多协议标签交换（MPLS）网络故障诊断与定位机制控制报文流量较大,不支持区分业务的生存性策略,不能自动触发的缺点,本文提出一种业务相关的故障自诊断与定位机制.该机制在业务源和目的节点之间建立一条与工作路径不相关的连接,与工作路径形成环路;当业务服务质量（QoS）性能下降时,自动触发业务相关的故障自诊断与定位机制,在环路上传输控制报文.仿真结果表明该机制不仅能够准确定位故障类型与发生位置,提供毫秒级故障自诊断与定位时间,还使用了较少的控制报文.

英文摘要：

In order to overcome the disadvantages that fault diagnosis and localization mechanism hasn＇t supported differentiated survivability strategy, can＇t be triggered by itself, and the control traffic has been vast in MPLS （multi-protocol label switching） networks, a service-related self fault diagnosis and localization mechanism is provided. The provided mechanism sets a path between source node and destination node which is irrelevant to the work path, and the set path and work path form a ring, then the service-related self fault diagnosis and localization mechanism can be triggered automatically and control packages are transformed along the ring when the QoS of service declined. Simulation results show that the pro- vided mechanism can not only ascertain the fault type and location accurately, provides milliseconds level fault diagnosis and localization time. but it also uses less control packages.