To configure Virtual Switch (vSwitch) VLAN Tagging (VST) on an ESXi/ESX host: Assign a VLAN to a portgroup(s). The supported VLAN range is 1-4094. Reserved VLAN IDs: VLAN ID 0 (zero) Disables VLAN tagging on port group (EST Mode) VLAN ID 4095 Enables trunking on port group (VGT Mode)