@TOSC then you have something between the ER605 and the unifi access points that do not support vlan. connect your SG300 switch directly to the ER605, then connect the access points to the SG300....

@TOSC Configure all ports like GE14 and you done..

@TOSC okay here is a screenshot of a Cisco SG300 in one of my networks, you need to add vlan on the ports that ned vlan, in your case most ports should look like what I have marked. first create vlan...

@TOSC no, it doesn't work with vlan, so you probably have to configure and everything is fine. but to be honest, since you have 30 unifi access points. buy yourself a USW-48-PRO-POE

@TOSC give me 10 minutes, I have a cisco switch here that has reset to deafult, I need to test

@TOSC it sounds strange, I have worked with Cisco for many years, but mostly firewalls but the managed switches must be configured with vlan otherwise they will not work with vlan. it is maybe...