交换机配置：
vlan batch 10 20 (创建vlan)
interface Ethernet0/0/1
port link-type trunk
port trunk allow-pass vlan 10 20
interface Ethernet0/0/2
port link-type access
port default vlan 10
interface Ethernet0/0/3
port link-type access
port default vlan 20
路由器配置：
interface Ethernet0/0/0.1
dot1q termination vid 10
ip address 192.168.10.254 24
arp boadcast enable
interface Ethernet0/0/0.2
dot1q termination vid 20
ip address 192.168.20.254 24
arp boadcast enable
