在Python中实现画图工具以解决水平分割问题

（3） 水平分割问题 R1#show ip int s0/0/0 Serial0/0/0 is up, line protocol is up Internet address is 192.168.123.1/24 （此处省略） Security level is default Split horizon is disabled //接口封装了帧中继后，水平分割被自动关闭 ICMP redirects are always sent （此处省略） 在 R1 上重新打开水平分割，在各路由器上检查路由表。 R1(config)#int Serial0/0/0 R1(config-if)#ip split-horizon R1#clear ip route * //清除路由表 R1#show ip route C 192.168.123.0/24 is directly connected, Serial0/0/0 1.0.0.0/24 is subnetted, 1 subnets C 1.1.1.0 is directly connected, Loopback0 R 3.0.0.0/8 [120/1] via 192.168.123.3, 00:00:01, Serial0/0/0 R 4.0.0.0/8 [120/1] via 192.168.123.4, 00:00:01, Serial0/0/0 //R1 可以获得 R3 和 R4 的环回口路由 R3#clear ip route * R3#show ip route C 192.168.123.0/24 is directly connected, Serial0/0/1 R 1.0.0.0/8 [120/1] via 192.168.123.1, 00:00:00, Serial0/0/1 3.0.0.0/24 is subnetted, 1 subnets C 3.3.3.0 is directly connected, Loopback0