@David-TP  Thanks on the reply, reason of the ask is that I'm using a D-Link unmanaged switch and I saw that you all say that those switch can be problematic as they don't support 1905.1, i would agree that D-Link does not mention it on their web site just like TP-Link doesn't either. Don't eant to change my switch based on "guesses".

If TP-Link Deco system requires to have switch which supports 1905.1, then why do you not advertise it ont eh switch web page?

it only says (for the TL-SG105):

  @Zigarooo 

I would love an answer to this too, as I'm currently using a D-Link switch with the XE75 and I'm having all sorts of problems with disconnects/reconnects.  (Then again, I'm having issues with that even when I bypass the switch entirely, and even over wifi with one of my devices.  But the switch seems to make the problem considerably worse.)

  @mryan143 

See Q6 of the following TP-Link FAQ: General questions about Ethernet Backhaul feature on your Deco