[mrtg] Re: how does mrtg work ?

[tony bourke]

Hello Manish,

You can find a somewhat simplistic explanation on my MRTG/Load Balancers
site:

http://vegan.net/MRTG/howitworks.php

Hope that helps

Tony


On Wed, 21 Nov 2001, Manish Jain wrote:

>
> Hello,
>
> I am doing some netwrok experiments on some internet paths and I need to
> know what is the link utlization and capacity of a particular link.
> For some time, I have been using
> been using MRTG graphs to get these values. I obtain the capacity of the
> link from the description of the interface at the begining of the webpage
> and the utilization from the graph itself.
>
> Lately, I realize that these MRTG grpahs graphs ( for the 5 min avergae )
> show the maximum inbound/outbound traffic to be more than the
> capacity of the link itself.
> This left me wondering how reliable are these values from MRTG graphs and
> I realized that I needed to know exactly how MRTG plots the graph.
>
>
> 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 ?
>
> I would be great if someone could share their knowledge with me or point
> me to where I could find more info about it ( my last resort would be to
> read the code ;-( ).
>
> Thanks,
>
> --
> manish jain
> university of delaware,newark
> (302) 454 1792
>
>
> The real problem is what to do with the problem-solvers after the problems are
> solved.
> -Gay Talese
>
>
>
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Tony Bourke				tony at vegan.net



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