[ixpmanager] Wrong values MRTG Max

Fri Sep 20 10:07:09 IST 2024

Hi Michel - I suspect yours are embedded because your using the RRD 
backend and rrd_graph creates the stats. The the mrtg logfile backend, 
IXP Manager has to calculate the stats.

  - Barry

> Michel Lanners via ixpmanager <mailto:ixpmanager at inex.ie>
> 20 September 2024 at 09:44
> Hello Barry,
>
>> On 20 Sep 2024, at 10:29, Barry O'Donovan (INEX) 
>> <barry.odonovan at inex.ie> wrote:
>
>> Michel Lanners via ixpmanager wrote on 20/09/2024 08:20:
>>> Something is fishy with the displayed data.
>>>  * your “current” value is exactly the same in all graphs, although
>>>    they were generated at different points in time - for me that’s
>>>    never the case, and for me these values are part of the generated
>>>    graph PNG, i.e. represent the reality at the time the graph was
>>>    produced - which is not in line with your timestamps in the graphs.
>>
>> While you're correct that the graph images are generated at different 
>> times, the table of values is generated in real-time by IXP Manager 
>> and when presented on the same page as the screenshot given, with the 
>> single read of the mrtg log/rrd data.
>>
>> I.e. all good here.
>>
>> I know some mrtg frontend's embed the values in the graph image but 
>> that's not happening here.
>
> Hmm, interesting, in our IXP Manager the table values are embedded:
>
> PastedGraphic-1.png
>
> But as I said, I have not played with graph generation, and it was not 
> me who set this up initially, so no idea how we ended up with these 
> graphs. Anyways, let’s not hijack this thread.
>
> Cheers
>
> Michel
>
> *Michel LANNERS*
> CIO at LU-CIX Management G.I.E.
> --
> <https://www.luxchat.lu/>
> Mail: michel.lanners at lu-cix.lu <mailto:michel.lanners at lu-cix.lu>
> Luxchat: @3eb2pdflrq57:01.lu-cix.luxchat.lu
> Phone: (+352) 28 99 29 92-81
> *LU-CIX Management G.I.E.*
> 202, Z.A.E. Wolser F
> L-3290 Bettembourg
> lu-cix.lu <https://www.lu-cix.lu>
> luxchat.lu <https://www.luxchat.lu>
> luxembourg-internet-days.com <https://luxembourg-internet-days.com>
> lunog.lu <https://www.lunog.lu>
>
>
>
>
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> Barry O'Donovan (INEX) <mailto:barry.odonovan at inex.ie>
> 20 September 2024 at 09:29
>
> Hi Michel,
>
>
>
> While you're correct that the graph images are generated at different 
> times, the table of values is generated in real-time by IXP Manager 
> and when presented on the same page as the screenshot given, with the 
> single read of the mrtg log/rrd data.
>
> I.e. all good here.
>
> I know some mrtg frontend's embed the values in the graph image but 
> that's not happening here.
>
>  - Barry
>
> Michel Lanners via ixpmanager <mailto:ixpmanager at inex.ie>
> 20 September 2024 at 08:20
> Hello Mauricio,
>
> I have no knowledge of how IXP Manager generates the MRTG graphs; 
> haven’t played with this (yet). But I’ve used MRTG extensively in the 
> past.
>
> Something is fishy with the displayed data.
>
>   * your “current” value is exactly the same in all graphs, although
>     they were generated at different points in time - for me that’s
>     never the case, and for me these values are part of the generated
>     graph PNG, i.e. represent the reality at the time the graph was
>     produced - which is not in line with your timestamps in the graphs.
>   * your “month” graph shows different data than your “week” graph.
>
>
> Giving that last comment a further thought, your “day” and “week” 
> graphs are missing the “max” values. You only show the average values, 
> whereas your month and year graphs do show maximums. These are your 
> pink and dark green lines on the graph - the light green and blue 
> lines are your averages, typically over 5 min if you haven’t changed 
> anything.
>
> Hence, the “max” values could very well be correct, and they match 
> what is displayed in the month/year graphs, but this information is 
> not visible in the day and week graphs.
>
> Which leaves still the “current” values somehow odd as being exactly 
> identical on all graphs… have you played with the commands/parameters 
> to generate the graphs?
>
> Cheers
>
> Michel
>
> *Michel LANNERS*
> CIO at LU-CIX Management G.I.E.
> --
> <https://www.luxchat.lu/>
> Mail: michel.lanners at lu-cix.lu <mailto:michel.lanners at lu-cix.lu>
> Luxchat: @3eb2pdflrq57:01.lu-cix.luxchat.lu
> Phone: (+352) 28 99 29 92-81
> *LU-CIX Management G.I.E.*
> 202, Z.A.E. Wolser F
> L-3290 Bettembourg
> lu-cix.lu <https://www.lu-cix.lu>
> luxchat.lu <https://www.luxchat.lu>
> luxembourg-internet-days.com <https://luxembourg-internet-days.com>
> lunog.lu <https://www.lunog.lu>
>
>
>
>
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> Mauricio Oviedo via ixpmanager <mailto:ixpmanager at inex.ie>
> 20 September 2024 at 01:49
>
> Hi Folks,
>
> I’m running into a weird problem with aggregates graphs of the IXP. 
> This happens specifically for the Max of the graph.
>
> Problem: The Max numbers show for example 100Gbit, but the graph 
> itself shows half of it.
>
> Any ideas of why it is happening?
>
> IXP Manager running in Ubuntu 22.04, v6.3.0.
>
> Best,
>
> Mauricio
>
>
>
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-- 

Kind regards,
Barry O'Donovan
INEX Operations

https://www.inex.ie/support/
+353 1 531 3339

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