Hi,  You don’t need an ip address for VLANs to work. VLANs are a layer 2 technology, they can separate networks without the VLAN itself being assigned an IP address. Assigning it one may help with routing, but is not required. The VLANs are active. Frames are tagged depending on which port they came from. Tagging is done at the port level in layer 2. It creates separate broadcast domains for the network. If a broadcast goes out on VLAN 4 in your setup G14,15 and 16 will all get the broadcast. 
I have  a 6248 Dell switch with following vlan's created interface vlan 2name "ISCSI1"exitinterface vlan 3name "ISCSI2"exit interface vlan 4name "CSV"exitinterface vlan 5name "LiveMigration"exit  And have interfaces assigned to the vlan's. interface ethernet 1/g2spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit !interface ethernet 1/g3spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit!interface ethernet 1/g4spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit!interface ethernet 1/g5spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit !interface ethernet 1/g6spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit!interface ethernet 1/g7spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 2exit!interface ethernet 1/g8spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit !interface ethernet 1/g9spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit!interface ethernet 1/g10spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit!interface ethernet 1/g11spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit !interface ethernet 1/g12spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit!interface ethernet 1/g13spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 3exit!interface ethernet 1/g14spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 4exit !interface ethernet 1/g15spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 4exit!interface ethernet 1/g16spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 4exit!interface ethernet 1/g17spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 5exit !interface ethernet 1/g18spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 5exit!interface ethernet 1/g19spanning-tree disablespanning-tree portfastmtu 9216switchport access vlan 5 However there is not ip address assigned to vlan, No network is assigned to any vlan. My question is are these vlan active and then how are they communicating with each other? 
vlan without assigning ip address