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随着现代网络规模不断扩大和结构日趋复杂,网络管理成为网络系统正常运行的关键,网管系统的基本功能是以图形方式直观地将被管对象显示出来,因而拓扑发现是不可缺少的一部分。拓扑发现确定网络元素之间的互连关系,是配置管理的中心,故障管理的基础。首先分析网络拓扑结构的分层管理,对于网络拓扑发现也应该分级实现:一级拓扑和二级拓扑。一级拓扑主要是发现路由器和子网,以及它们之间的互连关系,二级拓扑发现主要是发现子网内的主机以及子网类型。基于SNMP协议的网络拓扑发现主要是遁过一些算法,分层进行详细说明网络拓扑发现的过程。
With the continuous expansion of modern networks and the increasingly complex structure, network management has become the key to the normal operation of network systems. The basic function of network management systems is to graphically display the managed objects intuitively. Topology discovery is therefore an indispensable part. Topology discovery Determining the interconnection between network elements is the foundation of configuration management and fault management. First of all, analyze the hierarchical management of the network topology, for the network topology discovery should be graded: first-level and second-level topology. The first level of topology is to discover routers and subnets, as well as the interconnection between them. The second level of topology discovery is to discover the hosts and subnet types in the subnet. The network topology discovery based on the SNMP protocol mainly escapes some algorithms and describes in detail the process of network topology discovery.