Solved: Re: ATM CRC errors

sean · ‎10-19-2004

Could CRC errors on an ATM interface be from a rate-limit that is set too low (compared to the amount of normal traffic that crosses the link) causing the interface to occasionally drop cells containing the EoM 1?

stephenhewitson · ‎10-20-2004

Yes that could cause errors. I came across this problem a little while back where a customers router was set for a PCR of 20.48Mbps and our ATM switch was set to 20.00Mbps. The customer was seeing CRC errors on the routers interface.

I believe this is because the switch will only be dropping part of the packet due to the 53 byte cell and then the FCS will not match.

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stephenhewitson · ‎10-20-2004

Yes that could cause errors. I came across this problem a little while back where a customers router was set for a PCR of 20.48Mbps and our ATM switch was set to 20.00Mbps. The customer was seeing CRC errors on the routers interface.

I believe this is because the switch will only be dropping part of the packet due to the 53 byte cell and then the FCS will not match.