拓扑图如上图所示，用命令行配置4台路由器的OSPF路由协议
打开命令行，输入下图所示的命令，保存退出后即配置成功
Router>enable Router#config ter Enter configuration commands, one per line. End with CNTL/Z. Router(config)#router ospf 11 Router(config-router)#network 192.1.1.0 0.0.0.255 area 1 Router(config-router)#network 192.1.2.0 0.0.0.255 area 1 Router(config-router)#network 192.1.4.0 0.0.0.255 area 1 Router(config-router)#network 192.1.6.0 0.0.0.255 area 1 Router(config-router)#exit Router(config)#
同理，配置其他三台路由器
Router>enable Router#config ter Enter configuration commands, one per line. End with CNTL/Z. Router(config)#router ospf 22 OSPF process 22 cannot start. There must be at least one "up" IP interface Router(config-router)#network 192.1.2.0 0.0.0.255 area 1 Router(config-router)#network 192.1.3.0 0.0.0.255 area 1 Router(config-router)#exit Router(config)#
Router>enable Router#config ter Enter configuration commands, one per line. End with CNTL/Z. Router(config)#router ospf 33 OSPF process 33 cannot start. There must be at least one "up" IP interface Router(config-router)#network 192.1.4.0 0.0.0.255 area 1 Router(config-router)#network 192.1.5.0 0.0.0.255 area 1 Router(config-router)#exit Router(config)#
Router>enable Router#config ter Enter configuration commands, one per line. End with CNTL/Z. Router(config)#router ospf 33 OSPF process 33 cannot start. There must be at least one "up" IP interface Router(config-router)#network 192.1.4.0 0.0.0.255 area 1 Router(config-router)#network 192.1.5.0 0.0.0.255 area 1 Router(config-router)#exit Router(config)#
配置好后，在拓扑图上配置四台路由器的接口，然后配置好DNS服务器，填写两台PC的IP，就能用两台PC上服务器的网站
