Wired backhaul issue
Hi.
Looking for any input on this one. Got a Deco system installed at my parents. 4 Deco units, all X50 POE and all connected into a wired network so on a wired backhaul. Working perfectly for over 2 years now. Yesterday I noticed in the Deco app that one of the X50s had lost its wired backhaul and was showing as using wireless. Thought a reboot would fix it so rebooted the unit. Came back on and picked up the wired backhaul fine. However, I then noted another one of them was reporting as Wi-Fi. I ended up rebooting all of them but now I can only ever get 3 of the 4 to report as being on the wired backhaul, there is always one that shows as wireless. Decided to remove the units and set them back up but same issue. Also swapped out the POE switch in the loft that’s powering them in case that was an issue. Same thing. No matter what I try only 3 will use the wired backhaul. Out of ideas now as this was working fine but just started this issue yesterday. All the units are on the latest firmware. I think 3 of them are V2's and 1 of them is a V1 if that makes any difference. Thanks.
In Router mode, this is how Deco units should be connected:
If this is what you have, you'll need to check connection between Main Deco and switch. What you describe matches the problem when this connection is broken: something is wrong with Ethernet cable or it is disconnected from one end.
When that happens, the following occurs:
One of Satellite Deco (random one) will establish WiFi backhaul to Main Deco and all traffic going through the switch will pass to that Satellite Deco and from it to Main Deco. If you power off Satellite Deco with WiFi backhaul, one of remaining Satellite Deco will restore link to Main Deco by switching to WiFi backhaul.
That situation is also discussed here: https://community.tp-link.com/en/home/forum/topic/626634
