[SW1]int g0/0/1
[SW1-GigabitEthernet0/0/1] port link-type trunk
[SW1-GigabitEthernet0/0/1] port trunk allow-pass vlan 10 20 30
[SW1-GigabitEthernet0/0/1]qu
[SW1]int g0/0/2[SW1-GigabitEthernet0/0/2] port link-type trunk
[SW1-GigabitEthernet0/0/2] port trunk allow-pass vlan 10 20 30
[SW1-GigabitEthernet0/0/2]qu
[SW1]int g0/0/3
[SW1-GigabitEthernet0/0/3] port link-type trunk
[SW1-GigabitEthernet0/0/3] port trunk allow-pass vlan 10 20 30
[SW1-GigabitEthernet0/0/3]