Objective: Configure an 802.1q trunk between SW1 and SW2 with VLAN 20 as the native VLAN
SW1:
SW1(config)#int e0/0
SW1(config-if)#switch trun encap dot1
SW1(config-if)#switch trun native vlan 20
SW1(config-if)#switchport mode trunk
SW1(config-if)#no shu
SW2(config)#int e0/0
SW2(config-if)#switch trun encap dot
SW2(config-if)#switch trunk nati vla 20
SW2(config-if)#switch mode trunk
SW2(config-if)#no shu
SW1#sh int e0/0 switch
Name: Et0/0
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Operational Dot1q Ethertype: 0x8100
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 20 (Inactive)
Administrative Native VLAN tagging: enabled
Operational Native VLAN tagging: disabled
...
SW1#sh int trunk
Port Mode Encapsulation Status Native vlan
Et0/0 on 802.1q trunking 20
Port Vlans allowed on trunk
Et0/0 1-4094
Port Vlans allowed and active in management domain
Et0/0 1
Port Vlans in spanning tree forwarding state and not pruned
Et0/0 1
SW2#sh int e0/0 swit
Name: Et0/0
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Operational Dot1q Ethertype: 0x8100
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 20 (Inactive)
Administrative Native VLAN tagging: enabled
Operational Native VLAN tagging: disabled
...
SW2#sh int trun
Port Mode Encapsulation Status Native vlan
Et0/0 on 802.1q trunking 20
Port Vlans allowed on trunk
Et0/0 1-4094
Port Vlans allowed and active in management domain
Et0/0 1
Port Vlans in spanning tree forwarding state and not pruned
Et0/0 1
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