should I worry about error retry rates

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  • Question
  • Updated 2 years ago

Do I have to worry about following error and retry rates ? they look quite high to me :-S



Photo of mr bee

mr bee

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Posted 2 years ago

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Photo of Carsten Buchenau

Carsten Buchenau, Champ

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Short answer: YES


Longer answer:

As a rule of thumb, retry rates should not go over 10% (definitely not over 20%), and errors rates should be below 5% (not over 10%). These are very soft values based on my experiences, and it heavily depends on your deployment and environment.

Factors are:
  • Interference: Most likely the main issue, see below
  • Coverage: are all areas covered properly as to their usage?
  • Density: Are you providing enough radios for the amount of connections?
Also check the airtime utilization, should ideally not go over 50% in average (e.g. measured over 7 days), and not over 75% when you check the stats at peak time for 1 hour.

Interferences - Check:
  • Your channel assignment, 2.4 and 5 GHz. Consider a manual channel planning for 2.4. Consider using only 20MHz wide channels on 5. Consider disabling DFS in case you have the Radar problem.
  • Power level: Similar. Consider smaller cells, equal power level if you have an even deployment of APs. With a good AP coverage, you should never need to set 2.4GHz radios over 15dB. Often something around 10 is ideal -> it will affect channel utilization and retry rates immediately
  • SSID, connection rates: Disable low b/g/a rates (at least all below 12 dB), set 12 and 24 as Basic
There is much more... these are the basics. Search the forum for more :-)

Start with Channel and Power adjustments and see what affect this has on your retry and error rates. Then the SSID connection rate settings. Then search the forum for radio profile optimization in high-density environments (if this applies to you), and tune more.

Good luck :-)