采用自诊断与互诊断相结合的方法，给出了分布式诊断算法、图论模型、诊断内容及算法中使用的报文种类、故障向量。
This paper adopts the method that unites self diagnosis and interactive diagnosis, and presents the system graph theoretic model, diagnosis contents, some tokens and fault vectors.
提出了基于虚拟专用网的一种新的分布式分层系统级故障诊断算法。
A new distributed hierarchical system level fault diagnosis algorithm is presented for virtual private networks.
结果表明：改进的PMC模型适用，所提出的分布式系统故障诊断算法正确，故障诊断与验证应用程序可靠、实用。
The results show that the adaptive PMC model is applicable, the distributed system level diagnosis algorithm is proper, and the applications of diagnosis and verification are reliable and practicable.
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