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How to do this - and if it is even possible - depends on the SNMP support of the device. You'll need to check the documentation for your make and model of device, and find out which OID in the MIB the CRC error count is reported in (if any).
There is a standard ifErrors per-interface counter but this counts all errors (this may be sufficient for you though?) If thisis OK, use a Target of 'ifInErrors.x&ifOutErrors.x:community@device' for some interface number x, and you can use any of the other ways to specify an interface (by IP, name, type etc) instead of the .x if you prefer.
In any case youll need to create your own MRTG configuration file instead of using the standard MRTG Bundle script.
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Steve Shipway
UNIX Systems, ITSS, University of Auckland, NZ
Woe unto them that rise up early in the morning... -- Isaiah 5:11
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