Not able to change auto to trunk mode on switch

Unanswered Question
May 24th, 2006

SW-B-TOP(config-if)#switchport mode trunk

When trying to execute the above command am getting the following error.

Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode.

I have this problem too.
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Prashanth Krishnappa Wed, 05/24/2006 - 18:57

You will need to set the encapsulation type first if you want to force the interface to trunk. Assuming you want dot1q trunking, try the following

switchport trunk encapsulation dot1q

switchport mode trunk

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