CRC Errors on a 1841 router

Unanswered Question
Sep 14th, 2008


I see a lot of input CRC(cyclic redundancy check) errors on the serial port(1-Tcard) when I run the "show interface" command. Should I ignore it or try a new interface 1Tcard to eliminate the errors.

I have this problem too.
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harish.ab Sun, 09/14/2008 - 02:14

Hello, you can have a try with show controllers T1 and see if it is giving a lot of clock slips . the try to contact services provider. (clear counters and check this)

sibinmathews Sun, 09/14/2008 - 05:20

Hi Harish

I am not using a T1 card. I am using an HWIC-1T serial card. I had used the clear counter command earlier but still it is giving some errors but only a few. Can I afford to ignore it since no users are complaining and I beleive in crc errors the transmiting router will have to resend the packets.

harish.ab Sun, 09/14/2008 - 06:33

Hello Sibin,

Can you clear counter and give me output of show conttroller of 10 minutes.. I would check whether that is normal..



sdoremus33 Sun, 09/14/2008 - 08:33

Yes I would defintly recommend clearing counters and perform sh controllers to get a baseline of errors on your network


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