[mrtg] Re: dealing with transient interfaces, and adding several transients, how to ?

Leif Neland leifn at neland.dk
Sun Apr 16 22:54:03 MEST 2000

----- Original Message ----- 
From: "Voytek Eymont" <voytek at sbt.net.au>
To: <mrtg at list.ee.ethz.ch>
Sent: Sunday, April 16, 2000 8:33 PM
Subject: [mrtg] dealing with transient interfaces, and adding several transients, how to ?

> I have a system acting as a 'terminal server', it's a PC with multi i/o
> cards and a bunch of analogue modems attached to com ports.
> I would like to mrtg all these PPP sesions, individually, and, all together
> as well.
>  *when* there are calls/PPP sessions estabilished, mrtg can see
> these 'transient' interfaces, and, charts them properly.
> trouble is,, IF an interface is running at, say, 1000 b/s, and, at next
> pass, after 5 minutes, the session is disconnect/gone, then, on subsequent
> passes, mrtg doesn't see that i/f, UNITL another PPP sesion is
> estabilished, then I end up with a horizontal 1000 b/s line in between
> these two sessions.
> is there a way to 'drop' reading to zero when an interface 'dissapeared',
> rather, than 'extrapolate' it at last know reading ....?

See http://ee-staff.ethz.ch/~oetiker/webtools/mrtg/config.html#Options

Log unknown data as zero instead of the default behaviour of repeating the last value seen. Be careful with this, often a flat line in the graph is much more obvious than a line at 0. 


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