How to check for collision avoidance statistics?

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  • Updated 3 years ago
Sometimes, we can tell an AP is performing poorly by seeing jitter or packet loss  on a ping test. However, we would like to co-relate this test with some sort of indicator on the AP's side that there are lot of wifi collisions (RTS/CTS). We can see some stuff on the dashboard of "APs with the most spectrum utilization" but I don't know if this is sufficient or useful for precise troubleshooting.

What sort of places on HMOL (or other troubleshooting technique on the client side) can help us confirm that the AP is dealing with a high amount of contention for the channel it is operating on?

Thanks.
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David

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Posted 3 years ago

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Crowdie, Champ

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In HiveManager go to the Dashboard -> Troubleshooting.  The "Top 10 Aerhive Devices by Errors" and "Top 10 APs by Retries" widgets are excellent sources of information.  The stats are taken from the point of view of the access point so transmit errors/retries are from the access point to the client and received errors/retries are from the client to the access point.  The "Top 10 APs by Channel Utilization" and "Top 10 APs by Airtime Utilization" can assist if the results from the previously mentioned widgets are not what you expected.

To detect contention you really need to run an iPerf v3 server to monitor unexpected throughput changes.  These unexpected throughput changes can indicate contention issues.
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David

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ok. I'll look into that Presumably though, when I see RTT of packets greater than 10ms, varying between 200 and 800ms, there AP and its clients are probably "waiting" to transmit too often.

I'm wondering if I can find somewhere statistics for how often the AP has to "wait" for the channel to be clear.