Same problem with my setup. And no solution even with the latest omada update The only solution I have found is disabling LLDP-MED on the default profile and assign it to access port Keep the "all"...

@Vincent-TP After updating my hardware controller oc 300 v1, I got major problem with non corresponding uplink and downlink interfaces, got some ap as uplink. I have more than 500 endpoint connected...

@GRL In the GUI the problem was firmware outdated, and all VLAN are configured properly , after some test and changing the omada server ip seems to work now. Thank you

@OMADA-tunisia

Having more than 30 switch T1600G-28TS working fine with omada ver 5.x. After upgrading to omada 6.0 I can't manage them any more. All network is down. Can you add support for them

@Blgc verify that the fibre is multimode and not single mode fiber