@psychedelicu2 Why do you have another ip than router, do you have multiple dhcp servers in network or do you have a lage network

@Sissilo Yes I use a DAC cable between switch and router. config is the same interface gigabitEthernet 1/0/28 description "Port28" switchport general allowed vlan 2-3,20,30-31,300,555,678,888 tagged...

@Sissilo yes if you want vlan2 untagged on all 24 ports, yes. but I don't quite understand what you're going to do, why change all 24 ports to vlan2, do you trunk on the sfp ports? how are your trunk...

@cvxliao it's very limited what you can configure on the router, it's only pvid that's it.. so all vlans lurk in the background and create trouble for some devices.

@Sissilo this is one of my switch port config, vlan 300 is untagged interface gigabitEthernet 1/0/1 description "cam" switchport general allowed vlan 300 untagged switchport pvid 300 no switchport...

@Sissilo then I don't know, dokumentation say this, I use the switch in controler mode but I think the comand is the same