RX Error counters are incremented by frames received by the NIC that are corrupted in some way:
- Possible duplex mismatch on both interfaces of the link.
- Faulty NIC, cable, physical media issue.
- CRC failures.
In addition, NIC speed / duplex mis-match with the connecting port on the switch/router might be the cause.
Note: RX Drops in excess of 0.1% - 0.5% (it is recommended to err on the smaller value) of total transmitted packets are indicative of an issue. Anything below these % values can just be random errors / trivial effect on performance.