I am not using WIFI on the openwrt router, all radios are turned off. No SSIDs on the openwrt router. Only the TP-link mesh has the WIFI enabled. All clients connect via WIFI to the TP-link APs. All clients use DHCP of the openwrt router. The primary TP-link mesh AP is connected by an ethernet cable to a single openwrt router LAN port.
I'm trying to understand how a VLAN works, with only an ethernet cable between the TP-link primary AP to a LAN port on the openwrt router. How does openwrt know which clients to flag/tag with different VLAN IDs?