[mrtg] Re: how does mrtg work ?

[Manish Jain]

Hello Lars,

Thanks for the info. However, I was interested in obtaining
the names (OIDs) of the MIB objects that MRTG queries to
produce the graph.

For obtaining the info about the interface, I understand that
mrtg ueries the ifDescr , ifSpeed variables in the Interfaces group.

ifSepeed gives the max speed of the interface.
But the mrtg graph ( several that I have looked at ) show that many a
times , the inbound or outbound traffic in the last 5 min was more than
the max speed of the interface.
How do you explain this ?

I read the faq and the documentation, and couldnt find answer to this
question in them.


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manish jain
university of delaware,newark
(302) 454 1792


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On Wed, 21 Nov 2001, Lars [iso-8859-1] Holmström wrote:

>
> Jain,
>
> I believe all what you asked for is in the documentation, and maybe in the
> frequently asked questions and/or the FAQ ? Please look further at the bottom of
> all mails sent out by this maillistagent.
>
> My understanding is that;
> The descriptional information about an interface is retrieved by cfgmaker and is
> by that mean static.
> The SNMP counters MRTG defaults to is the counters for inbound and outbound bytes,
> which means that if you do not spcifically specify an OID in your Target, this is
> what MRTG will retrieve.
>
> /Lars
>
>
> Manish Jain wrote:
>
> > Hello,
> >
> >
> > I just know that MRTG uses SNMP to query the mib variables from the
> > network devices. I am not clear about exactly what varibales does it query
> > and how does it plot the graph .
> > Also, is the description of the interface just above these graphs queried
> > from the network device or is it a static value in the webpage ?
> >
> >
> > The real problem is what to do with the problem-solvers after the problems are
> > solved.
> > -Gay Talese
> >
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