[ixpmanager] Procedure to change/delete port without loosing historical graphs

[Barry O'Donovan (INEX)]

Hi Mauricio,

mrtg graphs are linked to the "virtual" elements of a member's port in 
IXP Manager which means they are decoupled from any specific piece of 
hardware. What I mean by that is:

- for a port, it's the physicalinterface.id and not a specific switch 
port - the physicalinterface object has a 1:1 relationship with 
switchports which can be changed.

- for a lag, it's the virtualinterface.id and not a specific bond / 
PortChannel on a switch. virtualinterfaces have a 1:n relationship with 
physicalinterfaces.

See https://docs.ixpmanager.org/usage/interfaces/ for a diagram and more 
info.

If you are upgrading a member which requires a switch port change, the 
procedure would be to edit the physical interface object in IXP Manager. 
I know you sometimes need to create a new interface in IXP manager for 
this so you can handle things like quarantine or other pre-migration 
checks. The inclination might be to delete the old interface and move 
the new one to production. What you should in fact do is delete the new 
temporary once and edit the old one.

If you do it like this, you'll preserve the historical data and LAG 
ports will "just continue" as they were graphing.

If you run into some edge case where this isn't possible, you'll need to 
manually work with the mrtg log/rrd files to copy data points over. On 
every graph there's a 'Backend Info' button on the top right when you're 
an admin which includes the 'Data File Path' which tells you what source 
file is used for that specific graph.

Hope that helps! Maybe let me know if it does or if it needs further 
clarification and we can add it to the docs.

  - Barry


> Mauricio Oviedo via ixpmanager <mailto:ixpmanager at inex.ie>
> 29 April 2023 at 00:06
>
> Hi,
>
> What would be the recommended procedure to “free” a port that was 
> previously used by a member (migrated i.e. from 10G port to 40G port), 
> without loosing the historical MRTG graphs?
>
> On the other hand, when trying to delete the port from the old member, 
> the following error is appearing:
>
> 500
>
> Server Error :: Undefined array key "HTTP_REFERER"
>
> IXP Manager V6.3.0
>
> Please advise, thanks,
>
> 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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