Nice question.
First, you should know which traffic is the management information,and which is the data information.
Second, you described a HA happen time. And at this time you should know anther thing is that you had opened the VM detecting which can be configed at the cluster “edit setting”. Help with the vmtools, your VC and ESX hosts can always detect your VM running.
When you use RDP to connect with your VMs, the data traffic will use the VM port group,at the same time VC and your ESX hosts use the service console to detect you VM’s status.
So, you can see,the management traffic will always use the service console, and the community information with the VM will be always used the VM port group.
BTW:When a host offline, VMs on it are not migrated,but restart on the other hosts or you can say other hosts restart those VMs.
