KB ID0001167
Problem
If you try and change a ports status, to make it a trunk port, you may see this error;
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Petes-Switch(config-if)#switchport mode trunk
Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode.
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Trunk Settings
I don’t know if this is a throwback to when we had ISL trunking and 802.1q, but you need to specify the encapsulation before you can specify a trunk.
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Petes-Switch(config-if)#switchport mode trunk Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode. Petes-Switch(config-if)#switchport trunk encapsulation dot1q Petes-Switch(config-if)#switchport mode trunk Petes-Switch(config-if)#
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Related Articles, References, Credits, or External Links
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