Virtual Switch Tagging (VST):

Virtual Switch Tagging (VST): 

  • 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

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