We use 2700 series ap with Cisco 9800 controller. In 5ghz network, we suspect dfs issue on the user side. we looked for on gui but not successful.So we need to find cli commands regarding to ap dfs scanning/radar scanning status summary and related events logging.
It appears that the "show wireless ap dfs" command is not available on your software version. The DFS/Radar feature may not be supported on your version of the Cisco 9800 software. I recommend checking the Cisco documentation for your specific software version to see if this feature is supported and if there are any alternative commands to check DFS/Radar status.
Please rate this and mark as solution/answer, if this resolved your issue All the best, AK
>....unfortunately there is no command like starting with "show wireless ap dfs ......" Checkout these commands instead : show wireless dot11h show ap auto-rf dot11 5ghz show ap name ap1 auto-rf dot11 5gh
M.
-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? ' When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '
Also here's what the syslog messages look like from COS APs (e.g. 1800/2800/3800 or Catalyst APs), it's probably different from the IOS APs like the 2702: kernel: [*02/26/2024 19:55:33.6542] wlan: [0:D:dfs] WLAN_DEBUG_DFS_ALWAYS : csc_wlan_dfs_handle_radar: RADAR confirmed. center freq = 5290, offset = 0, dfs_use_nol = 2 is_chirp = 0 sidx = 0
@khorram1998 please stop injecting your ChatGPT-synthesised answers into this community. You're wasting people's time and filling the threads with mostly generic rubbish and sometimes just plain wrong answers like above! Frankly I don't even know where ChatGPT got those answers from!
Since this thread seems to pop up a lot when I am doing AP troubleshooting I would like to add what helps me:
show ap auto-rf dott11 5gz | inc AP Name | Channel changes due to radar
This will give you and output like: AP Name : ***-AP17 Channel changes due to radar : 26 AP Name : ***-AP16 Channel changes due to radar : 11 AP Name : ***-AP18 Channel changes due to radar : 42
After finding these I was able to build a Special RF Profile with a 80mhz channel width that avoids the DFS range and apply it to the impacted APs.
Also worth reminding everyone that the wider your channel width the greater the chance of false radar detection. If you're getting radar detection when you're sure there is no radar then reduce the channel width. But also remember radar can come from many of the gadgets which get installed around the home/office/workplace - security systems, door motion sensors, lighting motion sensors etc.
