Comment 11 for bug 1837847

Above, in #10, you state: "I think that the "registration" of the client in Neutron (create a Port, assign an IP address, ...) should be done by the Neutron agent (instead of the procedure I described in #6)."

Have you considered doing this with agent extensions: https://docs.openstack.org/neutron/latest/contributor/internals/agent_extensions.html