[c-nsp] AAL5 CRC Errors on Cisco 7505 with Enhanced ATM

[Gert Doering]

Hi,

On Fri, Dec 17, 2004 at 09:22:51AM +1100, Skeeve Stevens wrote:
> Anyone know what would be causing these CRC Errors..   It is happening
> across a dozen or so PVC's.
> Just a hint on what to check, or to look at.
> 
> The CRC errors are not being seen on the other end. but they are seeing
> packet loss.

CRC errors on ATM PVCs hint at "dropped cells".  Usually this is because
the shaping parameters on the sending router don't match the policing
parameters in the network, and so the carrier drops cells.

It can also happen if the carrier network is saturated and can't transport
all the cells (remember: UBR = best effort, no guarantees).

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de