theres no command you can type to get the cause of the error.
your internal switch hardware is sending bad data to the switch logic. (crc errors indicate the data is not at the receiver)
this could be caused by the sender or receiver hardware in the switch.
you can begin trboubleshooting by removing all blades, except a single supervisor, powering on the chassis and thoroughly watching POST, checking tests after post and any logs for errors.
if this goes well, insert one of the removed blades. watch the POST and initialization of the blade and check the test and logs after it's operational. at this point, attempt to pass data, as much as possible, to try and attempt to get the symptom.
if no symptom, do the same with the next blade, etc, etc. until all blades have been tested and you either find your culprit or in worst case must keep looking.
(seems like hardware failure that needs to be replaced)
can TAC replace the supervisor?
