Learning OpenStack Networking - Third Edition

Specifying a port

Alternatively, users can specify a port that's been identified by the port's ID using the port-id key, as shown here:

--nic port-id=<Port ID> 

In this example, Neutron associates the existing port with the instance and sets the port's device_id attribute accordingly. A port can later be detached from an instance and associated with a new instance using this method. Possible options include auto, none, or the ID of an existing port. The default is auto.