中文摘要：

随着互联网应用的日趋广泛，网络的正常运行变得越来越重要，网络路由监测成为网络管理的重要组成部分。网络路由监测最常用的方法就是分析内部网关协议报文。Is-IS（Intermediate system to Intermediate system）协议是目前ISP广泛应用在大型网络中的内部网关协议之一。在对目前比较成熟的面向IS—IS网络的路由监测系统充分研究的基础上，设计并实现了一款针对Is—IS网络的NetMonitor系统。此系统较现有系统占用网络资源少，部署简单，能提供可视化的网络拓扑以便客观发现并分析网络中的异常。介绍系统整体架构与模块划分，详细阐述路由异常发现方法，提出网络采集设备的部署方案。通过使用仿真网络环境对系统测试，实验结果证实该系统满足网络监测对可靠性和实时性的要求，为网络运营管理提供决策依据。

英文摘要：

With the growing wider application range of Internet, the normal operation of network becomes increasingly important, to monitor network routings becomes an important part of network management. The most common methods of monitoring the network routings are to analyse the interior gateway protocol packets. IS-IS protocol is currently one of the interior gateway protocols which the ISP widely uses in large-scale network. Based on the full study of relatively mature/S-IS network-oriented routing monitoring system, we design and implement a NetMonitor system for IS-IS network. This system takes up less network resources than the existing system, is simple in deployment, and can provide visualised network topology in order to objectively identify and analyse network anomalies. This paper describes the overall system architecture and module division, elaborates the finding method of routing anomalies, and presents deployment scheme of network acquisition devices. By using a simulated network environment to test the system, the experimental results confirm that the system meets the requirements of network monitoring on reliability and real-time property, and provides the basis of decision-making for network operations management.