Virtual Switch Tagging
With Virtual Switch Tagging (VST), Ethernet layer-2 frames are tagged at the virtual switch layer. For this implementation to work, the physical NIC carrying the traffic should be connected to a physical switch port, which is configured to trunk the necessary VLANs. The virtual machine or VMkernel port groups created on the vSwitch will then need to be configured with the VLAN IDs of their respective subnets.
This is the most common and favored implementation in most large/medium/small environments, not just because of the flexibility it offers but also because of the fact that most modern day blade system environments have reduced the number of physical NIC ports on the server hardware, owing to the advent of 10 Gbps ...
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