Exactly one regular Neutron port. Has to be provided when the trunk is created. Cannot be changed during the trunk's life.

The parent port is the port you have to add to the instance at launch. Do not try to add the trunk or any of the subports to the instance directly.

Inside the instance the parent port's network will always be presented as the untagged network. It will be available early from the moment of bootup.

Note that some Neutron backends (notably the Open vSwitch based backend) only allow trunk creation before an instance is launched on the parent port. Other backends may allow trunk creation at any time during the life of a port.

Must not be the parent or a subport of any other trunks.