提出并实现了基于简单网络管理协议( SNMP)的大型异构IP网络拓扑发现方法,该方法包括代理发现、拓扑信息探测和拓扑信息分析三个步骤。对代理发现中的探测报文构造、去除冗余信息、信息分析算法以及非转发设备信息利用等关键问题进行了讨论,针对探测时遇到的路由器间歇性不响应、路由器过长时间不响应和探测目标为子网络号等问题进行了分析并给出了解决方案。实现结果表明,该方法可以高效地获取较为丰富的拓扑信息,与traceroute路径探测结合使用,可以极大地提高拓扑发现结果的完整性-Including agent discovery, topology information detection and topological analysis of information in three steps. The agent was found in the detection message structure, remove redundant information, information analysis algorithm and a forwarding device information utilization and other key issues are discussed, aiming at the detection when the router, router in response to intermittent not long time no response and target detection for the network number and so on are analyzed and the solutions are given. Implementation results show that, the method can effectively obtain more abundant topology information, and traceroute path detection used in combination, can greatly improve the integrity of the topology discovery