SOLVED: Deco X20 is unstable with Ethernet backhaul
I have the following configuration:
Ethernet
- Router
- Main Deco
- SG105
- Main Deco
- Satellite Deco 1
- Desktop
WiFi
- Satellite Deco 2
- All other devices
The satellite Deco 1 would never get past a blinking red light. From the app, I would see the satellite Deco 1 would join the network, then drop, then join, ad nauseum. The desktop was still able to access the network without issues.
In writing this up as a question, I realized that I also had the SG105 plugged into the router. As soon as I disconnected the SG105 from the router, the satellite Deco 1 came up fine and stayed on the network. Hopefully this post can save someone else a couple hours of frustration.