Open Stack

I could not find any API way to tell the difference between openstack
ports created automatically when a new instance got created, and
openstack ports manually created for port reservation purposes.

There's 'preserve_on_delete' attribute in the openstack database for
each vm instance, and if it is set to 'true', then the port was
manually created, if not, then it was automatically created. But
there's no API to retrieve this.

Am I missing something?

Hai