My "main router" is a TP Link DL-WRT1043ND with LEDE. VLAN support works fine there. I do not want to use wireless with this device but I want to use the Unfi device above to provide wireless.
Hi, did you figured out some solution? I have the same issue now. I have flashed my Unfi AP AC LR with last openwrt (OpenWrt 18.06.1 r7258-5eb055306f / LuCI openwrt-18.06 branch (git-18.228.31946-f64b152) ) and missing switch settings for VLAN settings.
My main router is apu2 with opnsense and trunking VLAN to my first AP (TP-Link 1043D, works fine here).
How can I setup my VLAN in Unfi AP AC LR?
Unfortunately I cannot provide a detailed howto now.
If I remember correctly the trick is: When adding a new "Interface" under "Network" -> "Interfaces" you need to chose "custom interface" in the drop-down menue of "Cover the following interface" and type "eth0.5" for instance (VLAN 5 is my guest network).
Then under "Network" -> "Wireless":
Afterwards you can link a wireless network to the new interface.
This does more or less (in)directly link a wireless notwork to a VLAN.