[mrtg] Mrtg error - trying to determine the real cause.

[Dan]

Mersberger, Robert wrote:
> I posted this the other day but have had any feedback.  Can anyone help?
>  
> 
> ------------------------------------------------------------------------
> *From:* mrtg-bounces at lists.oetiker.ch 
> [mailto:mrtg-bounces at lists.oetiker.ch] *On Behalf Of *Mersberger, Robert
> *Sent:* Tuesday, August 21, 2007 12:32 PM
> *To:* mrtg at lists.oetiker.ch
> *Subject:* [mrtg] Mrtg error - trying to determine the real cause.
> 
> See the attached information
> <<Mrtg error on blswr8e6b.rtf>>
> I get this error frequently on this device only and it always seems to 
> be on the same interface.  Can anyone help be out with an explanation of 
> why this is happening and if there is anything that can be done to 
> correct this or stop it from happening.

Hmm.

I had a look at this when you posted but couldn't really work out why it 
was failing

You get a similar output you get when the device is either unreachable 
or not responding to SNMP queries - the 'Eval' errors are just a symptom 
of the failure but I'm not sure it's this.

Questions...

1. Can you post the CFG file portion for this interface?
2. Is the interface Gigabit or above, if so are you using SNMPv2 via the 
:::::2 option to prevent counter wrap?
3. If you are using rateup rather than RRD, what are the values in the 
log file for that interface around about the time it fails?
4. Are you monitoring several devices of this type with no issue on 
similar interfaces?
5. If you increase the retry/timeout/backoff value for the target with 
the options( [:[prt][:[tmout][:[retr][:[backoff][:vers]]]]]) does this 
make a difference?
6. What is the CPU of the box doing when the failure occurs - I have 
seen both my work and home boxes completely fail to process the UDP 
reply when CPU peaks.

Dan.