Re: flexible radio assignment - Page 2

Moudar · ‎05-22-2023

Hi,

I have a classroom with about 35 devices (Ipads and laptops connecting to 5GHz), when all are connected and students are doing what they have to do, the channel utilization is reaching 80 and 90%. So my idea was to use FRA to share the load on 2 5GHZ radios. AP is 2802 and WLC 5520 running 8.10.181.3

When i manually changed the 2.4 radio to 5GHz everything was fine until the next class that the students had!

I was sitting and watching the AP on the WLC GUI (Access Point View)

The problem I had was that many devices jumped all the time between the two 5GHz radios the students had a very bad experience when that was happening. (The devices were settled, no one was moving around) the AP is placed in the middle of the classroom ceiling.

What is Throughput in the picture above? When all were connected Throughput was about 3 Mb, up and down

Moudar · ‎05-23-2023

I will create a new RF profile with 24Mbps mandatory and check if it will be better.

Why should "Noise" increase when channel utilisation increase a little bit:

Moudar · ‎05-24-2023

24 Mb should be mandatory or disabled? On 5GHz, 2,4GHz or both? Today we run our WLC with 18Mb mandatory on 5GHz and 12Mb mandatory on 2,4GHz.

I think it's worth trying higher data rates in some crowded places with RF profile!

Rich R · ‎05-25-2023

> 24 Mb should be mandatory or disabled? On 5GHz, 2,4GHz or both?
I'm talking about 5GHz. We use 24 Mbps Mandatory and all lower data rates disabled.

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TAC recommended codes for AireOS WLC's and TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's, Best Practices for 9800 WLC's and Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
Field Notice: FN63942 APs and WLCs Fail to Create CAPWAP Connections Due to Certificate Expiration
Field Notice: FN72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Required
Field Notice: FN72524 IOS APs stuck in downloading state after 4 Dec 2022 due to Certificate Expired
- Fixed in 8.10.196.0, latest 9800 releases, 8.5.182.12 (8.5.182.13 for 3504) and 8.5.182.109 (IRCM, 8.5.182.111 for 3504)
Field Notice: FN70479 AP Fails to Join or Joins with 1 Radio due to Country Mismatch, RMA needed
How to avoid boot loop due to corrupted image on Wave 2 and Catalyst 11ax Access Points (CSCvx32806)
Field Notice: FN74035 - Wave2 APs DFS May Not Detect Radar After Channel Availability Check Time
Leo's list of bugs affecting 2800/3800/4800/1560 APs
Default AP console baud rate from 17.12.x is 115200 - introduced by CSCwe88390

Leo Laohoo · ‎05-25-2023

In both 2.4- and 5.0 Ghz, disable all data rates from 11 Mbps and below. Make 18-, 36- and 54 Mbps Mandatory and the rest are Supported.

eglinsky2012 · ‎05-23-2023

Check out this bug, "High channel utilization on 5GHz radio with 40Mhz". It's fixed in 8.10.185.0.

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwb51757

On that note, I forgot to ask, are users experiencing slowness, or did you just notice that high utilization was reading high?

As for throughput, what you showed in the original screenshot is the current measured amount of traffic the radio is passing, not what it's capable of or what the clients would show on a speed test. You mentioned 3Mb up and down. Was that a speed test done from the client device?

Moudar · ‎05-24-2023

This is interesting. maybe it is time to upgrade.

3Mb is what WLC showed under "Throughput" When many clients were connected.