Important notice – Jump directly to more recent Ubiquiti and management VLAN blog post. This post is now somewhat obsolete as you don’t need to perform steps described here because there is an option to set management VLAN using simple configuration mode.
First step
Login to device as an administrator user.
Second step
Select Network tab.
Third step
Change Configuration mode from Simple to Advanced.
Click Change button.
Fourth step
Add desired VLAN to LAN and WLAN interfaces.
Click Change button.
Fifth step
Create new bridge and add earlier defined VLAN interfaces to it.
Click Change button.
Sixth step
Change Management Interface to earlier created bridge and adjust network settings.
Click Change button.
Seventh step
Apply or test changes on the top of the page.