Within VMware there are 3 methods around VLAN tagging. They are EST, VST and VGT.
Below shows the differences between the 3,
|Type||Physical (VNIC)||Virtual (vSwitch)|
|EST||Access port||Access port|
|VST||Trunk port||Access port|
|VGT||Trunk port||Trunk port|
Within EST (External Switching Tagging) VLAN tags are not handled. The physical switchport is configured as an access-port and no vlan id is configured on the port-group. Traffic is sent to onto the port group without any vlan tagging occurring.
Within VST (Virtual Switch Tagging) the physical switchport is configured as a trunk port. The port-group is then configured with a VLAN ID of 1-4094. Traffic is received on the vnic tagged, the VLAN tag is then removed and the traffic sent onto the corresponding port-group untagged.
Within VGT (Virtual Guest Tagging) only vlan tagged traffic is handled. The physical switchport is configured as a trunk port and the port-group is then configured with a VLAN ID of 4095 (All). Traffic is received on the vnic tagged. The traffic is then sent onto the port-group still tagged.
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