To troubleshoot physical layer issues within the fabric
Switch# show interface <ethernet 1/1>
.....
RX
0 unicast packets 200563 multicast packets 0 broadcast packets
200563 input packets 27949761 bytes
0 jumbo packets 0 storm suppression bytes
0 runts 0 giants 0 CRC 0 Stomped CRC 0 no buffer
0 input error 0 short frame 0 overrun 0 underrun 0 ignored
Reference