Router
Router(config)#int f0/0
Router(config-if)#ip address 172.16.1.1 255.255.255.0
Router(config-if)#no shutdown
Router(config-if)#exit
Router(config)#router rip
Router(config-router)#version 2
Router(config-router)#no auto-summary
Router(config-router)#network 172.16.0.0
Router(config-router)#exit
Router(config)#ip dhcp pool kaikai 下饭pc需要的地址与（网关）
Router(dhcp-config)#network 192.168.1.0 255.255.255.0
Router(dhcp-config)#default-router 192.168.1.1
Router(dhcp-config)#dns-server 8.8.8.8
Router(dhcp-config)#exit
Switch
Switch(config)#ip routing
Switch(config)#int f0/1
witch(config-if)#no switchport
Switch(config-if)#ip address 172.16.1.2 255.255.255.0
Switch(config-if)#no shutdown
Switch(config-if)#exit
Switch(config)#int f0/2
Switch(config-if)#no switchport
Switch(config-if)#ip address 192.168.1.1 255.255.255.0
Switch(config-if)#no shutdown
Switch(config-if)#exit
Switch(config)#router rip
Switch(config-router)#version 2
Switch(config-router)#no auto-summary
Switch(config-router)#network 172.16.0.0
Switch(config-router)#network 192.168.1.0
Switch(config-router)#exit
Switch(config)#int f0/2
Switch(config-if)#ip helper-address 172.16.1.1
Switch(config-if)#exit
Switch(config)#end
测试网通没通：
Switch#ping 172.16.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds:
!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/1 ms
PC拿到地址了，✌