It shows the VLAN configuration of the switch ports. 
VLAN-tagged packets are accepted if the port is a member of that VLAN; VLAN untagged packets are accepted and forwarded to the port that matches the Port VLAN Id.
Untagged/Access Ports
Packets egressing from Untagged (or Access) ports are untagged, i.e., they don’t have the VLAN tag.
Tagged/Trunk Ports
Tagged ports accept any packet that belongs to an assigned VLAN. The VLAN must exist before the port can be assigned. The Egress packet includes the VLAN tag.
Add VLAN
Go to the NETWORK::SWITCH::VLAN page
Click Add (displays dialog)

Enter VLAN
On Select Tagged Ports, select from the left-side panel, and click Addâ–º to move to the right-side panel. To remove from the right-side panel, select and click â—„Remove.
On Select Untagged Ports, select from the left-side panel, and click Addâ–º to move to the right-side panel. To remove from the right-side panel, select and click â—„Remove.
Click Save
Edit VLAN
Go to the NETWORK::SWITCH::VLAN page
Select the checkbox next to the item to edit
Click Edit (displays dialog)
Make changes, as needed
Click Save
Delete VLAN
Go to the NETWORK::SWITCH::VLAN page
Select checkbox next to item to delete
Click Delete
On the confirmation dialog, click OK