?Router0配置代码如下：
##配置端口IP地址
Router(config)#int fastEthernet 0/0
Router(config-if)#ip address 192.168.10.254 255.255.255.0
Router(config-if)#no shutdown?
Router(config-if)#int fastEthernet 0/1
Router(config-if)#ip address 192.168.20.1 255.255.255.252
Router(config-if)#no shutdown?
##配置静态路由：目标网络号 子网掩码 下一跳
Router(config)#ip route 192.168.30.0 255.255.255.252 fastEthernet 0/1
Router(config)#ip route 192.168.40.0 255.255.255.252 fastEthernet 0/1
若下一跳使用端口，则端口为路由器自身前往目标网段的出接口
?Router1配置代码如下：
##同Router0
Router(config)#int fastEthernet 0/0
Router(config-if)#ip address 192.168.20.2 255.255.255.252
Router(config-if)#no shutdown?
Router(config-if)#int fastEthernet 0/1
Router(config-if)#ip address 192.168.30.2 255.255.255.252
Router(config-if)#no shutdown?
Router(config)#ip route 192.168.10.0 255.255.255.0 fastEthernet 0/0
Router(config)#ip route 192.168.40.0 255.255.255.0 fastEthernet 0/1
Router2配置代码如下：
##同Router0
Router(config)#int fastEthernet 0/0
Router(config-if)#ip address 192.168.30.1 255.255.255.252
Router(config-if)#no shutdown?
Router(config-if)#int fastEthernet 0/1
Router(config-if)#ip address 192.168.40.254 255.255.255.0
Router(config-if)#no shutdown?
Router(config)#ip route 192.168.10.0 255.255.255.0 fastEthernet 0/0
Router(config)#ip route 192.168.20.0 255.255.255.252 fastEthernet 0/0
PC0 ping PC1
