Flex-DFS without DBS

steiostb1 · ‎07-01-2019

Is it possible to enable Flex-DFS without enabling DBS? I am not interested in the DBS feature, but would like the FLEX-DFS (Cleanair) to detect radar signals.

We have currently enabled FRA on our APs and are experiencing a lot of radio-channel change due to rader signal detected. I might think that FLEX-DFS would exlude fake detections.

Thanks

Rich R · ‎07-02-2019

What APs and what code version are you using?
There is a known problem with the cheaper low-end APs using an inferior chipset which is much more prone to false detection of radar.
Increasing channel width magnifies the problem - 20MHz almost none, 40MHz frequent false detections, 80MHz practically unuseable due to constant false detections. For some AP models Cisco updated the code to reduce the number of false detections but it does not eliminate the problem.Recommended workaround is stick to 20MHz channel width 🙂
This is the fix they put in for us: https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvg62039

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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
Field Notice: FN74383 APs Running 17.12.4/5/6/6a May Run Out of Flash Space Preventing Upgrades
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

steiostb1 · ‎07-03-2019

Thank you for your reply.

We are using 8.3.150 code (which should not be affected by this bug as its fixed in 8.3.141) and 2802 APs. All APs are running on 20MHz bandwidth. This issues only occur on the redundant XOR-5GHz radio.

patoberli · ‎07-03-2019

Very weird, I suspect another bug if you only see the issue on the XOR radio. I suggest you open a TAC.