Hello everyone,
Today I will share with you how to deal with AP do not select channel from "dca-channel".
Issue Description
S12704
Software: V200R010C00SPC300
The customer claimed that after he configured the following commands, the AP will select a channel that is not present in the list,after calibration.(example : channel 40)
regulatory-domain-profile name profile_x
country-code NL
dca-channel 5g channel-set 36,44,52,100,108,116,124,132
Accoring to documentation, the dca-channel channel-set command configures a calibration channel set.
Below we can see that the AP selected channel 40, although channel 40 is not present in the list
[s-wlan-view]dis radio ap-group APs-NLH | include 40
CH/BW:Channel/Bandwidth
CE:Current EIRP (dBm)
ME:Max EIRP (dBm)
CU:Channel utilization
ST:Status
--------------------------------------------------------------------------------
AP ID Name RfID Band Type ST CH/BW CE/ME STA CU
--------------------------------------------------------------------------------
495 9c50-ee34-4160 1 5G an11ac on 40/20M 14/22 0 1%
502 9c50-ee22-6de0 1 5G an11ac on 40/20M 14/22 3 1%
--------------------------------------------------------------------------------
Solution
The reason that the AP’s select other channels instead the channels configured with dca-channel command is the following:
If the AP detect the radar signal at 5GHz channel, the AP will switch to another channel. All the AP vendor follow the backoff mechanism.
Radar Channel Channels 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, and 140 can be used as radar channels. If the channels supported by some countries or regions overlap with the radar signals, avoid using the radar channels.AP will switch to all the channels the country-code supported randomly , not guarantee the non-radar channels, normally the non-radar channels is prior.
Installing the V2R11C10 version will solve this. (the firmware will be released in November)
Thanks!
