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For debugging a Duplex there are mostly 2 ways
-1st way: If your switch has some port counter you would see CRC error on a duplex mismatch port
-2nd way: If you have a tap you can bring it in between the switch port and the device, and then you should see corrupted ethernet CRCs - a mirror port is not enough as a mirror port eliminates the frames with corrupted CRC errors.
But maybe your issue is on the uplink of the switch, where the devices with the problem are located.
For debugging a Duplex there are mostly 2 ways
ways_
-1st way: If your switch has some port counter you would see CRC error on a duplex mismatch port
port -2nd way: If you have a tap you can bring it in between the switch port and the device, and then you should see corrupted ethernet CRCs - a mirror port is not enough as a mirror port eliminates the frames with corrupted CRC errors.
But maybe your issue is on the uplink of the switch, where the devices with the problem are located.