do you trunk on the sfp ports? how are your trunk ports? No not use sfp port

@Sissilo ok I understand SG3428MP(config-if)#interface range gigabitEthernet 1/0/1-24 SG3428MP(config-if-range)#switchport general allowed vlan 2 untagged SG3428MP(config-if-range)#switchport pvid 2...

@Sissilo So for my switch could I do this? interface gigabitEthernet 1/0/1-24 description "none" switchport general allowed vlan 2 untagged switchport pvid 2 no switchport general allowed vlan 1

@Sissilo Sorry but I need to see all the complete commands.... Is this how I should write? SG3428MP(config)#switchport general allowed vlan 1 1-24 untagged SG3428MP(config)# no switchport general...

@Sissilo Unfortunately, it doesn't work. Error: 'no' is not applicable

@Sissilo Ok now I'll give it a try and let you know