Thanks so much, I now have a point to start checking... alex
On Wed, Feb 23, 2011 at 5:37 PM, Kasper Adel <[email protected]> wrote: > Hi, > > Usually when Cyclic Redundancy Check (CRC) errors are incrementing in the > show interface command output, it indicates that the cyclic redundancy > checksum generated by the originating LAN/WAN device does not match the > checksum calculated from the data received. On a LAN, this usually indicates > noise or transmission problems on the LAN interface or cable. A high number > of CRCs is usually the result of collisions or a station transmitting bad > data. > > So we can safely assume that CRCs are a very critical alarm and it can not > be ignored so I don’t think there should be a threshold in general, the NMS > should monitor interfaces for CRCs and if the number increments then an > immediate check is needed, we are talking on the core links here. So we cant > wait till the counter increments. > > Once we have CRCs, then we have a bad cable, port or router and this needs > immediate attention. > > Regards, > Kim > > > On Wed, Feb 23, 2011 at 3:53 PM, Harold 'Buz' Dale <[email protected]>wrote: > >> First thing I would do would be to check for a duplex mismatch and then >> check the wiring (either by replacing the cable if it's a simple patch or >> using a cable tester over the span.) You might also just physically trace it >> and see if someone decided to hang a fluorescent light off of it or >> something too. >> Luck, >> Buz >> >> -----Original Message----- >> From: [email protected] [mailto: >> [email protected]] On Behalf Of alex nyagah >> Sent: Wednesday, February 23, 2011 6:19 AM >> To: [email protected] >> Subject: [c-nsp] CRC Errors on Ethernet Router >> >> Hi All, >> >> I am noting CRC errors on my Ethernet port on my cisco router, what could >> it >> be causing it.. >> >> -- >> ** >> _______________________________________________ >> cisco-nsp mailing list [email protected] >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ >> >> _______________________________________________ >> cisco-nsp mailing list [email protected] >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ >> > > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
