I'm in the early stages of testing some vlan changes in vsphere 5.5. We have trunk capable physical switches managed by another team. I have 2 test hosts in a cluster with one nic connected to these switches, and I have vswitches on each host with one untagged port group and another port group tagged with vlan ID 30. The physical switch port has vlan 30 on it.
When I change the vm network properties from the untagged network label to the label tagged with vlan 30, the vm loses the connection. When I move back to untagged, the vm is online again. Is that because the physical switch port currently only has one vlan ID?