摘要： 为分析计算机网络中级联失效对服务性能的影响，在考虑初始负载、节点转发速率和路由策略的基础上，建立一种基于负载容量的级联失效模型。定义吞吐量、负载率和服务时延3个评价参数，对级联失效发生前后网络服务性能的变化进行度量。以BA无标度网络为对象进行仿真实验，结果表明，该模型能客观反映级联失效导致网络服务性能急剧下降的现象，对级联失效的预防和控制具有一定指导意义。
关键词:
级联失效,
计算机网络,
负载容量,
服务性能,
最短路,
时延
Abstract: In order to investigate the impact of the cascading failure on the services performance in computer networks, considering the initial load, node forwarding rate and routing policy, a cascading failure model based on the load-capacity is established. Three evaluation parameters, throughput, load rate and service time delay, are used to measure the changes in the performance services before and after cascading failure. The simulation result in BA scale-free network shows that this model can reflect the phenomenon that cascading failure will decrease service performance. This model has the guiding significance for prevention and control of cascading failures.
Key words:
cascading failure,
computer networks,
load capacity,
service performance,
the shortest path,
time delay
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