Partial APs Cannot open 2.4Ghz on WLC5520

[ShengxiangZhang67519]

We have 37 APs. AP models are all 3802. Only 23 devices can be seen under 802.11b/g/n, as shown in the figure below. You can see 51 devices under 802.11a/n/ac. Some customers told us that their devices that can only use 2.4Ghz cannot connect to wifi. I know that 2.4ghz is not enabled on some APs. How can you turn them on? And those devices that I can't see under 802.11b/g/n have two 5Ghz frequency bands turned on.

[Leo Laohoo]

Is Flexible Radio Assignment (FRA) enabled?

[ShengxiangZhang67519]

I'm not on site now, where is this configuration roughly?

[Leo Laohoo]

Wireless > Advanced > RF Management > Flexible Radio Assignment

[ShengxiangZhang67519]

ok. Thank you.After enabling this function, each AP will automatically enable dual 5Ghz frequency bands or other frequency bands according to the surrounding environment?

[Scott Fella]

Take a look at the link for more in depth explanation of FRA.

https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-3/b_cisco_aironet_series_2800_3800_access_point_deployment_guide/b_cisco_aironet_series_2800_3800_access_point_deployment_guide_chapter_011.pdf