Ethernet backhaul not working with Deco X20s in supported configuration
I have the following config: router connects to main Deco port 1. Main Deco port 2 connects to a TL-SG105 switch. The first satellite Deco port 1 also connects to the SG105 switch. The second satellite Deco has no hardline connection.
The Deco app reports a WiFi backhaul for both satellite Decos. If I bypass the SG105 switch and connect the first satellite Deco directly to the main Deco, the app reports an Ethernet backhaul for the first satellite Deco. If I connect the first satellite Deco to the Main Deco via the SG105 switch again, the backhaul returns to WiFi.
The main Deco is running in router mode. All cables are known good.
I've read several posts about similar issues, but the solutions are always to use the configuration I'm using. Guidance would be appreciated.