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An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode

Situation: when attempting to configure trunk mode in Cisco switch, you may receive this message: Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode

Resolution: You will need to configure encapsulation dot1q first as show screenshot. Note: it is recommended to setup switchport nonegotiate.

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