What is CRC and how does it works?
CRC errors refer to Layer 1 or 2 issues.
Two things you should check :
1. Both the ends of the interfaces have some speed and duplex settings.
2. Check the physical cabling or copper line.
CRC (Cyclic Redundancy Check) is apolynomial function on the frame which returns a 4B number in Ethernet Frames.
It will catch all single bit errors and a good percentage of double bit errors. It is thus meant to ensure that the frame was not corrupted in transit.
The CRC is an error detectionalgorithms and is designed to maximize the probability of detecting errors using only a small number of redundant bits. The CRC-32 gives strong protection against common bit errors in messages that are thousands of bytes long. If you want to know more about how does it works, I recommend a book called <Computer Networks - A systems approach>. The CRC algorithm is discussed around page 92 through 102.