@Buck65605 Do you mean you wanna deploy the network like CPE510)))((((CPE510-----EAP225-Outdoor? If so, definitely it is OK.

@GoldDome First of all, it should be noted that the prerequisite for the link backup function to work is to enable Load Balancing, but when link backup is in effect, Load Balancing is not working....

@bfaler Would you be able to provide some more information on what you are seeing or how this is setup (connections, firmware versions etc). Any screenshots would also help. What is the currently...

@neutron_spin Just need to notice that choose the WAN connection type correctly. The physical connection should be ISP modem---ER605 WAN-ER605 LAN----Switch.

@nurix Here is a similar post that should solve your problem： https://community.tp-link.com/en/business/forum/topic/502374

@JunIT07 Unfortunately, if you use the controller manage ER605, controller will wipe everything.