@BJRYamba, I had similiar issue with wireless bridge to a Verizon router. The Verizon router has an option to enable/disable the two 5GHz radios independently. Maybe that is an option on the Nest...

@NielsS Is it enough to set the SPF+ ports (#25-28) as Tagged for it to work (on both switches)? And then rewire... Setting ports as Tagged is a vague statement as you can not just tag a port. You...

Kimberley_j87 wrote @D-C solution was a net gear switch. Worked perfectly as soon as I plugged it in. @Kimberley_j87, the other one should have worked that easily too. I'll assume it was defective....

@Kimberley_j87, everything appears to be connected correctly and should work. It's always possible that the switch is not working properly, but in my experience if it powers on, it works. You could...

@GeneraalSpeknek, not sure it this would be a problem, but the network your using is not a reserved public network address and also noticed that the DHCP range starts on the interface IP. Can you try...

@Kimberley_j87 that router's is a beauty. 🙄 This all looks correct. The yellow wire goes from ONT #2 (GE1) to Router #6. Blue wire goes to the lounge (I assume) What's the flat white wire? Does that...