ip nat inside
no shutdown
interface fastethernet0/2
ip address 220.156.66.117 255.255.255.248
duplex auto
speed auto
ip nat outside
no shutdown
路由：
ip route 0.0.0.0 0.0.0.0 220.156.66.117
过载：
ip nat inside source list 110 interface FastEthernet0/2 overload access-list 110 permit ip 192.168.0.0 0.0.255.255 any
2、配置Core switch
VTP：
VTP Version: 2
Configuration Revision: 7
Maximum VLANs supported locally : 1005
Number of existing VLANs: 9