[mrtg] Re: Wrong log entries when using high AbsMax-option?

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Wed Sep 19 13:40:43 MEST 2001

Christoph Wagner wrote:

> I have a router which has a frame-relay-connection and the bandwidth ist set
> to the CIR-value and CIR=MAXBYTES. As a higher value can occur I activated a
> AbsMAX[_]: 128000000 on all my interfaces (=1Gbit/s).

No, 128000000 is not 1000 Mbit/s, it is 1024 Mbit/s.

> Now I got wrong entries showing up to 80Mbit/s on a line with interface
> clock 1Mbit/s. Can anybody explain me how this can happen and what to do?

You told MRTG that the maximum can be 1024 Mbps.  You wonder why
you get values of upto 80 Mbps.  You know the interface speed is
1 Mbps.

I just wonder why you didn't set AbsMax to 1 Mbps (125000) and MaxBytes
to the CIR.

Counter roll-overs may be the cause of the spikes.  Other possibilities
include buggy software (MRTG or the SNMP agent on the device).

 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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