@cacb Thanks for your input. In that thread another person mentioned an IPTV/VLAN option under advanced. I don't have it but maybe I have to be in Rourter mode to see it? Would be great if some one could confirm that. I would like to know if I can configure my M9+ set to VLAN 101 as my ISP demands to bypass their (bad) router completly.

I am on 1.4.2 after the hassel getting on 1.4.0 I got the update easily through the app.

@TP-Link_Deco Thanks but I don't see it. I am running AP mode right now, does the IPTV/VLAN option only show up under Advanced when I change to Rourter mode? 

@TP-Link_Deco Got it, makes sense. And just to 100% sure: the page you refer to mention M5 not M9+ but that is supported too, right?

@TP-Link_Deco Thanks for the feedback, but that link is somewhat confusing. In the article, VLAN and IPTV are 2 different entries. I have 1.4.2 firmware and the latest Deco App + my Deco M9+ in router mode I see a different situation.

Under More >> Advanced there is a single entry called "IPTV/VLAN", not one entry for VLAN and another for IPTV as shown in the linked article. When I click the IPTV/VLAN option, I am presented with the following

This seems to imply that you cannot configure VLAN and at the same time use wired backhaul between Deco units?

@TP-Link_Deco Thanks for that but I think you could awoid a lot of these questions by prioritizing update of your guides/Q&As upfront. I am pretty sure the "business case" in that is positive for you. Anyway, please conform the following:

M9+ fully supports VLAN (including VLAN 101; I suppose it's a setting) when connecting the three units via ethernet backhaul.

Thanks

I have my Deco M9+ in Router mode now using VLAN ID 101 as my ISP demands. It works fine. Question: does the VLAN Prority (0 to 7 setting) impact the performance? I have it set to 7 now and tried 1 before but I can't figure out if it makes a difference.