[ixpmanager] League table

[Barry O'Donovan]

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