CRC errors and/or late collisions can be caused by a duplex mismatch. When one site of a link is configured on full-duplex and the other on half-duplex you will see the CRC errors at the interface which is configured on full-duplex.
This problem occurs also when one site of a link is configured on auto-duplex and the other fixed (full-duplex).
Duplex mismatches caused very big performance problems, so be very sure both sites of a link are configured the same.
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