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New Member

FCS Errors

Can someone give me a good explanation of what an FCS error is (utilizing a Catalyst 5500 Switch), and what might be causing an excessive number on a fast Ethernet port.

Your help is greatly appreciated.

2 REPLIES
Cisco Employee

Re: FCS Errors

On the 100full duplex link, this is the indication of the speed/duplex mismatch, please make sure that the speed and duplex is hardcoded to 100/full on both switch and server site..

Here is the good url for the ref.

http://www.cisco.com/warp/customer/473/53.shtml

http://www.cisco.com/warp/customer/473/3.html

New Member

Re: FCS Errors

Thank you for the Info. This is what I had expected. I was not able to check the system.

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