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Jung Torres
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Cisco Command : What is the difference between switchport mode trunk from switchport trunk allowed vlan all?

does "switchport mode trunk" command allow all vlan by default or I do I need to issue "switchport trunk allowed vlan all" ?
CiscoSwitches / HubsNetworking

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Jung Torres

8/22/2022 - Mon
Don Johnston

switchport mode trunk makes an interface a trunk port (can carry multiple VLANs).

By default, all VLANs are allowed on a trunk port.  

So no, you do not need to issue a "switchport trunk allowed vlan all".  Unless a prior command was issued to restrict the allowed VLAN's.
Jung Torres

I see,
from show run command, this is what I'm seeing on the interface.
Switchport trunk allowed vlan 1,10
switchport mode trunk

Does this allow only vlan 1 and 10 or does it allow all vlans because of the command "switchport mode trunk"?
Don Johnston

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Jung Torres

Great.  I really appreciate your assistance :)
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James Murphy
Jung Torres

Thank You :)