- All packets passing through the virtual switch would be tagged with VLAN ID which is done by the virtual switch before leaving the ESXi/ESX host.
- The portgroups connected to the virtual switch must have an appropriate VLAN ID specified that is through a VLAN ID range of 1-4094.
- With Virtual Switch Tagging (VST) several VLANs per Physical Network Cards is possible.
- The ESXi/ESX host network adapters must be connected to trunk ports on the physical switch.
- 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)
- Set the switch NIC teaming policy to Route based on originating virtual port ID (this is set by default).
Advantages of VST:
- Several VLANs on a single pNIC possible
- Still easy to setup on the ESX side unless admins are aware of VLANs
Disadvantages of VST:
- ESX admin need to know the setup of the physical switch
- Only one VLAN on a single virtual NIC inside the VM