Enable VM tag vlan on ESXi - Shammer's Philosophy

According to this site, ESXi supports 3 patterns vlan. 1st is Virtual Switch tagging, 2nd is External Switch tagging, 3rd is Virtual Guest tagging.

Virtual Switch tagging

In this environment, ESXi physical NIC sends out packets with vlan tagging. Then, GuestVMs receive a packet without vlan tagging from ESXi physical NIC. So,

GuestVMs don't require vlan tagging configuration on Guest OS layer
External Switch opposite of ESXi should be configure vlan tag

External Switch tagging

With this configuration, all physical interfaces are untagged on ESXi. ESXi physical NIC and GuestVMs receive a untagged packet only from external switch. External Switch should be configured to send untag packets to ESXi.

Virtual Guest tagging

Configuring vSwitch vlan ID as 4095 enables that GuestVMs can receive all tagged vlan packets. 4095 seems to mean as vlan tagging pass through. I have never tried this but I want to try in the future.