Binding type for EPGs
staticBinding: A free DistributedVirtualPort will be selected and assigned to a VM when it is reconfigured to connect to the portgroup.
dynamicBinding: A free distributed virtual port will be selected and assigned to a virtual machine when the virtual machine is powered on.
ephemeral: A DistributedVirtualPort will be created and assigned to a VirtualMachine when the virtual machine is powered on, and will be deleted when the virtual machine is powered off.