I had a situation recently in which a Gig port was connected to another vendor's equipment. The port was statically configured as a .1q trunk.
Oddly, it was reporting being in an administrative mode of 'trunk', but an operational mode of 'static access'.
In order to correct this, I had to perform a shut/no shut on the port, it then showed an operational mode of 'trunk'.
Any idea on why/how this might have happened?