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Community Member

WS-X6548V-GE-TX FCS and RCV-Errors

I am looking for some guideance on troubleshooting the following problem.

Catalst 6500 with a WS-SUP720-3B running 12.2(18)SXD4 code.

All ports setup as follows.


Interface gig X/Y

switchport mode access

switchport access vlan 1

spanning-tree portfast

no shut


When you connect client A to port 8/3

you start seeing the FCS error counter increase only on port 8/3.

When you remove client A form port 8/3 and move it to port 8/4 and then run the same test you do not see any FCS Errors on ports 8/3 or 8/4.

Then you take client B and place it in port 8/3 and run the same test you do not see any FCS Errors.

Then you remove client B from port 8/3 and place it in port 8/4 and then move client A back to port 8/3 the FCS Errors startup again.

My question is,why don't we see FCS Errors on any device that is attached to port 8/3 ?


Re: WS-X6548V-GE-TX FCS and RCV-Errors

Is 8/4 configured exactly the same ? The port 8/3 is setup as auto so you have to make sure the client you are using is also setup as auto , if it is hardcoded then you will get fcs errors.

Community Member

Re: WS-X6548V-GE-TX FCS and RCV-Errors

Yes, ports 8/1 - 48 are all configured the same.

Yes, All clients are set to auto/auto.

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