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Switch(config)#interface fa0/port_number
Switch(config-if)#switchport mode trunk
Switch(config-if)#switchport trunk encapsulation {dot1q | isl | negotiate}
Switch(config-if)#switchport mode dynamic {desirable | auto}
Switch(config-if)#dot1q native vlan vlan-id

Vypnuti trunku:

Switch(config-if)#no switchport mode trunk

nebo:

Switch(config-if)#switchport mode access

Router-on-a-stick:

Router(config)#interface fa0/0.10
Router(config-subif)#encapsulation dot1q 10
Router(config-subif)#ip address 192.168.10.1 255.255.255.0