[mrtg] Re: Data collected is out of reality

[David Gutiérrez Rueda]

Hello :

    Thanks Jakob. The problem appears in any device with ATM interfaces (Cisco, Fore, ...).
I've reproduced the error (1e+16) resetting the port counters of a switch. I think the problem
could be related to the counter roll-over conversions (32 vs. 64 bits) of rrdtool update (¿?).
Any idea?

Thanks
Best regards
David

Jakob Ilves wrote:

> Hello David!
>
> David Gutiirrez Rueda wrote:
> >
> > Hello,
> >
> > I've updated MRTG to 2.8.12 + RRD and I'm having problems
> > with the data MRTG is collecting. Altough MRTG is working fine
> > with almost every network device (we monitor a lot of switches and routers), some graphs
> > generated by 14all.cgi show a big line very far from the bandwitdh of the interface.
> > rrdtool fetch shows ~ 2e+16 bytes for that peaks. I'm still using (in other machine) MRTG
> > 2.2 and the data is correct in that moment. Any suggestion?
>
> Is there any pattern in what kinds of interfaces this occur on?  Are
> they of a specific type or on a specific host or cathegory of hosts?
>
> Perhaps there is a bug in the handling of counter roll over (the latter
> is when a counter reach it's maximum value and then starts over at it's
> lowest possible value) and some software mistakes the huge (negative)
> delta to be the actual number of bytes being transmitted.
>
> HTH
>
> Best regards
>
> /IlvJa
>
> --
>                (Jakob Ilves) <jakob.ilves at oracle.com>
>             {Oracle Global IT, Network Management Group}
> [Office as well as mobile phone: +46/8/477 3666 | Fax: +46/8/477 3572]
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David Gutiérrez Rueda
Grupo de Redes - SdI

Universidad Carlos III de Madrid
Campus de Leganés
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