To Verifying that Access Points Join the Controller or not there are two ways as below.
Please go through the step by step to find the APs joined state
When replacing a controller, you need to make sure that access points join the new controller.
Using the GUI to Verify that Access Points Join the Controller
Follow these steps to ensure that access points join the new controller.
Step 1 Follow these steps to configure the new controller as a master controller.
a. Click Controller > Advanced > Master Controller Mode to open the Master Controller Configuration page.
b. Check the Master Controller Mode check box.
c. Click Apply to commit your changes.
d. Click Save Configuration to save your changes.
Step 2 (Optional) Flush the ARP and MAC address tables within the network infrastructure. Ask your network administrator for more information about this step.
Step 3 Restart the access points.
Step 4 Once all the access points have joined the new controller, configure the controller not to be a master controller by unchecking the Master Controller Mode check box on the Master Controller Configuration page.
Using the CLI to Verify that Access Points Join the Controller
Follow these steps to ensure that access points join the new controller.
Step 1 To configure the new controller as a master controller, enter this command:
config network master-base enable
Step 2 (Optional) Flush the ARP and MAC address tables within the network infrastructure. Ask your network administrator for more information about this step.
Step 3 Restart the access points.
