针对运行BPG协议的骨干网络面临CXPST攻击风险,采用Petri网的网络建模工具,对骨干网的拓扑结构进行了建模分析,通过设计仿真工具,模拟CXPST的攻击过程,建立CXPST攻击过程的特征抽取与建模,实现对大规模骨干网络的安全风险评估。仿真实验表明,该仿真模型对骨干网风险评估时,其骨干节点失效正确率为84.5%,节点失效延时误差为11.3%。 The backbone network running BPG protocol is faced with the risk of CXPST attack. The network modeling tools of Petri net are used to analyze the topology of the backbone network. The simulation tools are designed to simulate the attack process of CXPST and establish the characteristics of the CXPST attack process Extraction and modeling to achieve security risk assessment of large-scale backbone network. Simulation results show that when the simulation model is applied to the backbone network risk assessment, the failure rate of the backbone node is 84.5% and the node failure delay error is 11.3%.