Code:
CORE-SW#sh int trunk
Port Mode Encapsulation Status Native vlan
Fa1/15 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa1/15 1-4094
Port Vlans allowed and active in management domain
Fa1/15 1,10,20
Port Vlans in spanning tree forwarding state and not pruned
Fa1/15 1,10,20
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