如果出現下列的錯誤訊息

core(config-if)#switchport mode trunk
Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode.

請先設定trunk的encapsulation
core(config-if)#switchport trunk encapsulation dot1q
core(config-if)#switchport mode trunk
core(config-if)#end
即可

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