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no switchport mode dynamic desirable

mode access to mode trunk

I got a Cisco 2950 swicth where a port is configured "access vlan 54". I want to make vlan 54 native on this and put a vlan 150 over it.

I then have to enter something like:

 interface FastEthernet0/4  description vers switch admin1 fa0/17  switchport trunk encapsulation dot1q  switchport trunk native vlan 54  switchport trunk allowed vlan 54,150  no cdp enable 
Unfortunately, when runnnig the configuration, I get:
 interface FastEthernet0/4  description vers switch admin1 fa0/17  switchport trunk encapsulation dot1q  switchport trunk native vlan 54  switchport trunk allowed vlan 54,150  switchport mode dynamic desirable  no cdp enable 
Whatever I tried, I always got the "switchport mode dynamic desirable"...

no, then mode trunk

The solution was to negate the dynamic and directly force trunk. I entered the configuration in this order:

 interface FastEthernet0/4  no  switchport mode dynamic desirable  switchport mode trunk  switchport trunk encapsulation dot1q  switchport trunk native vlan 54  switchport trunk allowed vlan 54,150  no cdp enable 
I'm done!

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