实验代码：
system-view
vlan 10
vl 20
qu
int gi 1/0/48
port link-type trunk
port trunk permit vlan 10 20
qu
int gi 1/0/1
port link-type trunk
port trunk permit vlan 10 20
路由器代码：
syytem-view
int gi 0/0.10
vlan-type dot1q vid 10
ip add 192.168.10.254 24
qu
int gi 0/0.20
vlan-type dot1q vid 20
ip add 192.168.20.254 24