ATC3000系统网络故障分析与研讨

Fault Analysis and Discussion of ATC3000 System Network

民航珠海进近管制中心ATC3000自动化系统网络异常降级。通过故障调查和网络结构研究,结合STP、VLAN、MPLS VPN协议在系统中的应用,调查结果为中南宽带网MPLS L2 VPN未配置VLAN导致深圳ADS-B网络的生成树协议BPDU广播到ATC3000网络。发生根桥震荡,重新收敛生成新的树拓扑,此时因ATC3000交换机过度级联发生了网络环路,造成网络风暴,系统降级。

The network of ATC3000 automation system in Zhuhai Approach Control Center of CAAC was degraded abnormally.Through fault investigation and network structure research,combined with the application of STP,VLAN and MPLS VPN protocol in the system,the investigation results show that MPLS L2 VPN of Central South broadband network is not configured with VLAN,which causes the spanning tree protocol BPDU of ADS-B network in Shenzhen to broadcast to ATC3000 network.The root bridge oscillates and converges to generate a new tree topology.At this time,due to the excessive cascade of ATC3000 switches,network loops occur,resulting in network storm and system degradation.