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Not able to change auto to trunk mode on switch

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.

1 REPLY
Cisco Employee

Re: Not able to change auto to trunk mode on switch

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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