The AP is operating the master. You can not connect another AP in this state. The symptom is that other APs are displayed on the Master AP management page. But the state is disconneted. Could you tell me why?
This is what I did.
1. Full AP firmware upgrade (R510 18.104.22.168.228)
2. Same settings
Here is the network configuration.
1. Setting management IP trunk
2. Three vlans (two ssid, one management)
Thank you for your help.