[ixpmanager] Spikes on MRTG graphs

[Barry O'Donovan]

This is exactly as Martin suggests and also how we fix it too.

  - Barry

Martin J. Levy wrote on 28/03/2020 01:29:
> This is (at least with the second graph) a known issue with MRTG 
> systems. If I recall correctly you should be able to edit the raw data 
> file (in-between 300 second polling intervals) and replace the value 
> from its obviously too-high number back down to a reasonable number 
> (I.e. something averaging tge before/after numbers). His type of MRTG 
> hack has to be documented somewhere - but I don’t know where.
> 
> There’s also some max limits that can be set in your config file so that 
> you don’t see this bad a spike in the future.
> 
> Remember - MRTG data file are fixed length, so don’t just delete a line. 
> Oh - and back your file first. Plus - test editing first by using a 
> spare port and it’s data file.
> 
> Martin
> 
>> On Mar 27, 2020, at 6:05 PM, Vladislav Bidikov 
>> <vladislav.bidikov at finki.ukim.mk> wrote:
>>
>> 
>> Hi all you IXP people,
>>
>> We seem to have some strange issue with spikes happening when our 2 
>> switches get the connection back (after a fiber was cut)
>> Although this looks cool like a very good IXP in reality it destroys 
>> our graph levels...
>>
>> http://prntscr.com/ro54fc
>>
>> http://prntscr.com/ro54kh
>>
>>
>> Any idea how to fix this or maybe smooth it...
>>
>> IXP.mk is getting momentum and this is still a issue we see at least 
>> two time this week (we hope there will be no more fiber cuts in the 
>> next few months)
>>
>> On the other hand - any good tutorial on how to setup Sflow with 
>> Quanta QNOS and Linux ?
>>
>>
>> Best regards,
>>
>> -- 
>> V.B
>> FCC
>>
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> 
> 
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-- 

Kind regards,
Barry O'Donovan
INEX Operations

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