Dear @batibotsky,

My question is How or If I shutdown the system, (will be replacing the switch)will it loose the current connected clients via voucher and configurations once i power up the system again or is there a technique on how to replace a hardware without disturbing the system.

If the EAPs are shut down, the current connected clients will lose the connection via voucher for a while since the EAPs are off and stop broadcasting the wireless signals.

Configurations on the Controller will not be lost unless you reset it, so the voucher will come back to work once the EAPs are powered up again and connected back to the controller.

Dear @batibotsky,

Thank you for the reply. I appreciate it very much. I was hesitant for awhile disturbing the system because I read somewhere that some users experienced their authentication (voucher) became non existent and anyone can access after a shut down of the omada controller and the eap was left running, when the system went online anyone can access the network with previous authentication or non. But I guess it was a bug that was fixed with the updates in firmware and software.

Welcome~Glad to know if I can help here. In normal case, if the Omada Controller is shut down but the EAP is still running, voucher authentication will no longer be provided until the Omada Controller comes back to work again, so newly connected clients can’t pass the authentication while authenticated clients keep the previous authentication status and can go to the Internet.

Related FAQ for your reference, https://www.tp-link.com/support/faq/1041/

For your case, I think your EAP will lose power for a while if the switch is used to supply power, so it is a different thing from above.