@hermeson, see the FAQ from TP-Link I have linked to in post #6, you will see the menu of TL-SL3428 and T3700G-28TQ:

@hermeson, sure I got it. This is usually called QinQ, or Tag in Tag or VLAN VPN or (new to me) VLAN over VLAN or double tagged frames. Do you get it that different vendors use different terms? It...

@hermeson, this are just different terms for the same thing. In TP-Link's terminology it is called VLAN VPN b/c it is used mainly by ISPs to create a VPN for a customer by using VLAN over VLAN. See...

bincomIT wrote So we also have not upraded all APs and in the past we never had such issues regarding FW Upgrades with TP-Link stuff. Yes, TP-Link usually does very intense testing of new firmwares...

JSchnee21 wrote As part of this feature request re: firmware / controller validation check, it would be realy nice if Omada / OC-200 could show us the changelog / release notes for the new version of...

@hermeson, AFAIK, TL-SG2210P smart switch does not support VLAN VPN aka Tag in Tag aka QinQ. You need a managed switch which supports QinQ. T2500G and T3700G support QinQ, probably others, too.