[mrtg] Re: link utilisation for compressed links

Lightfoot.Michael Lightfoot.Michael at comcare.gov.au
Thu Nov 14 00:19:00 MET 2002

> -----Original Message-----
> From: Mustafa Kapadia [mailto:Mustafa_Kapadia at mumbai.tcs.co.in] 
> Sent: Thursday, 14 November 2002 1:43 AM
> To: mrtg at list.ee.ethz.ch
> Subject: [mrtg] link utilisation for compressed links
> Greetings,
>     how mrtg takes care of link utilisation for compressed 
> links??  Does mrtg require some compression information in 
> form of an oid in cfg file.
Because compressed links have no quantifiable maximum MRTG cannot really
provide realistic % utilisation.

The best way to deal with it is to set MaxBytes to the uncompressed link
size and AbsMax to some arbitrary figure that you never expect to
exceed.  Your graph will then show how your compression is performing
(link utilisation will be >100%) as well as show the raw thruput.  For a
64K compressed link the MaxBytes would be 8000 and AbsMax something like
16000 (note these are Bytes/sec).

Dealing with Frame Relays is  similar, except you know the theoretical
limit and set AbsMax to that.  For example for a 1544Kb/s FR with a PVC
CIR at 256Kb/s you set MaxBytes to 32000 and AbsMax to 193000 (note
again that these are Bytes/sec.)
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