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The answer has the interfaces grouped into po11, and configured as trunk interfaces

no interface po11
interface range e0/0 - 2
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 11 mode active


However, don't we have to specifically configure int po11 as a trunk as well?

EX
Interface po11
switchport trunk encapsulation dot1q
switchport mode trunk

Switchport trunk allowed vlans x,x,x

?????
On modern devices, when you configure the command "channel-group <number> mode <active|passive>" on interfaces, the configurations under the interfaces are copied to the Port-channel automatically.