Hi,
There is no command in Aruba or Provision OS switches to set the port to default settings.
The best way to check the configuration on a particular port and delete it would be "show running-config interface X".
It will give the detail configuration about that port.
Then you can remove desired configuration by enter "no" before any command you dont want.
But these "no" commands needs to be run inside the interface context.
I hope this information is helpful.
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Thanks
Kashif Khan