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3.2.1. Trunk Ports
Trunk ports tag frames with VLAN information so the receiving switch knows which VLAN the frame belongs to.
Trunk Configuration:
Switch(config)# interface GigabitEthernet0/24
Switch(config-if)# switchport trunk encapsulation dot1q
Switch(config-if)# switchport mode trunk
Switch(config-if)# switchport trunk allowed vlan 10,20,30
Switch(config-if)# switchport trunk native vlan 99