Yes this is possible. You can integrate active directory or ldap to iMaster from administrator account and then you can select that AD group in user authentication policy.

Not really it both switches automatically decides the renumber. But it is good practice and recommended to set the renumber manually because if your stack reboots then renumber can change if it is not manually set.

C9200l is l2 by default and it do not support inter vlan routing

RP means Redundant port and it just monitor the peer redundant device wlc RMI means Redundant Management Interface which monitors Management gateway to trigger the failover So RMI+RP mens it monitors the peer device and also the management gateway In case if any one of these two is down failover is triggered

@@easyconcepts5820 thank you for responding. So RMI+RP is the best option for physical devices

Please check if your phone is getting IP from DHCP and also verify if you are able to reach nac server IP from phone subnet

If the SSID is enabled and in broadcast then it will show up in phone/laptop. May be you see this issue when you are on the edge of wifi signal coverage. Or you can also try by restarting your phone because sometimes phone can be behaving abnormally and require restart.

It was the power supply of my AP had a half life

Which interface you shutdown on wlc-1 ? From which interface you are accessing wlc from lan or through management ?

@@easyconcepts5820 Through LAN Ten1/0/1 - WLC-01 AND Ten2/0/1 - WLC-02 I din't confing the managament interface or connect it into my switch

@@ariaskendry try with shutdown complete wlc 1 and then access the wlc 2 and check failover.

Hello Kendry, I had the same issue trying the failover. If you shut the interface, the WLC2 doesn't backup. But if you shutdown the controler it will backup (i don't know the reason). When i configure a cluster i always have to create a first failover electrically. After that the interface fail backup works... really strange.