[mrtg] Re: MRTG methodology

Roth, Gabrielle gabrielle.roth at xo.com
Thu Sep 27 19:11:04 MEST 2001

Hi Tyler,
Welcome to the mrtg list.

The 'clear counters' question is an interesting one.  Here's my post from a
few months ago on the subject:
Here's the official explanation from Cisco:
http://www.cisco.com/warp/public/477/SNMP/5.html#Q5 (that whole doc is
pretty useful actually)

As for how mrtg does its data calculation...I'm pretty sure Alex explained
this in the FAQ (http://faq.mrtg.org/) but I'm getting a 'server down'
message from the FAQ right now.


"Five out of four people have a problem with math."

>I think my question is this.  What happens if those counters were to be
>cleared? (by a 'clear counters' on a Cisco for example).  Would all my
>graphs have a spike down to zero on them?  How exactly does 
>the averaging
>work?  I know I can put the 'guage' keyword in the options to 
>signify that
>the data is a 'current status' measurement and not a 
>cumulative one, but
>I'd like to better understand how MRTG does it's data calculation.

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