实验拓扑图：
IOU1的配置
Configure terminal
Interface Ethernet 0/0
Duplex full
Ip address 10.0.10.1 255.255.255.0
No shutdown
Exit
Interface loopback 0
Ip address 192.168.10.1 255.255.255.0
No shutdown
Exit
Interface loopback 1
Ip address 172.16.10.1 255.255.255.0
No shutdown
Exit
Router rip
Network 172.16.10.0
Network 192.168.10.0
Network 10.0.10.0
Exit
IOU2的配置
Configure terminal
Interface Ethernet 0/0
Duplex full
Ip address 10.0.10.2 255.255.255.0
No shutdown
Exit
Interface Ethernet 0/1
Duplex full
Ip address 10.0.12.1 255.255.255.0
No shutdown
Exit
Interface loopback 0
Ip address 192.168.20.1 255.255.255.0
No shutdown
Exit
Interface loopback 1
Ip address 172.16.20.1 255.255.255.0
No shutdown
Exit
Router rip
Network 10.0.10.0
Network 10.0.12.0
Network 192.168.20.0
Network 172.16.20.0
Exit
IOU3的配置
Configure terminal
Interface Ethernet 0/0
Duplex full
Ip address 10.0.12.2 255.255.255.0
No shutdown
Exit
Interface loopback 0
Ip address 192.168.30.1 255.255.255.0
No shutdown
Exit
Interface loopback 1
Ip address 172.16.30.1 255.255.255.0
No shutdown
Exit
Router rip
Network 192.168.30.0
Network 172.16.30.0
Network 10.0.12.0
Exit
查看show配置：
使用show ip protocols查看路由协议信息
使用show IP route查看路由表
在每台IOU上关闭路由汇总功能，并提升RIP版本
Router rip
Version 2
No auto-summary
Exit
再次使用show IP route查看路由表
使用show ip protocols查看路由协议信息
