[ixpmanager] League table

[Mario Klobucar]

Hi Barry

Thanks for explaining.
When we are comparing data from LibreNMS and (IXP manager x 33,3/24) we are
getting similar results.

If you can improve reporting in future that would be great.

Thanks
mario

-----Original Message-----
From: Barry O'Donovan <barry.odonovan at inex.ie> 
Sent: 23 March 2020 10:47
To: INEX IXP Manager Users Mailing List <ixpmanager at inex.ie>; Mario Klobucar
<Mario.Klobucar at srce.hr>
Subject: Re: [ixpmanager] League table

Hi Mario,

Mario Klobucar wrote on 23/03/2020 08:38:
> I am trying to calculate how much data is crossing exchange (or port).
> 
> When I look at one member port I am getting different results for one day.
> 
> a)When I take daily avg for that port and then calculate 24*3000/8 I 
> am geting 47.89 TB
> 
> b)When I look at league table I am getting 84.62 TB
> 
> c)When I look at LibreNms and avg there I am getting 55.62.TB
> 
> There is a huge difference in calcuating from awg and league table data.
> 
> Can someone explain me why is there difference, and more important 
> which metod should I use for calculating data that is passing exchange.


If you look at an IXP Manager graph, you'll notice a 'day' graph is not
24 hours but rather 33.3 hours and a week is actually 8.33 days. Where did
this come from? We started over 15 years ago with MRTG and have mostly
followed its methodology (see mrtg's src/rateup.c).

This is fine within IXP Manager because the league table (and the new
utilisation tool) compares like with like.

I can't speak to what LibreNMS does.

If I wanted to calculate (estimate) how much data is crossing exchange I'd
probably grab the ixp/ixp001-bits.log file in MRTG and take a 24 hours
period (say midnight to midnight).

I'll have a think about if we can/should better represent a day as 24 hours
in the league table (or even create a different tool / report for that
information).

  - Barry