Why Is the RU Channel Usage 0 on the AC or Central AP?

In the AC+central AP+RU networking or central AP+RU networking: Run the display radio { all | ap-group ap-group-name | ap-name ap-name | ap-id ap-id } command to check radio information about RUs. In the command output, CU (indicating the channel usage) is displayed as 0.

RUs do not proactively report the channel usage to the AC or central AP. To query the channel usage of RUs, enable the data buffer function on the AC or central AP.

The ap data-collection enable command enables the data buffer function on the AC or central AP. After this command is executed, a large data buffer occupies the device memory and affects device performance. It is recommended that the undo ap data-collection enable command be executed to disable data buffer after the query.