VLAN trunk and tagging between Cisco and ESX(i)

IEEE 802.1Q VLAN tagging  between Cisco Trunk ports and vSwitches

Be sure to use dot1q and not isl encapsulation on trunk interfaces that will be connected to the physical NIC on your host.

By default the switch will allow traffic from all VLANs through the trunk port.
Configure the interface of the switch with these 2 lines:
1.) Switch#(config-if)>  switchport trunk encapsulation dot1q

2.) Switch#(config-if)> switchport mode trunk


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