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I view the codes.

In the method nova.compute.manager.ComputeManager.detach_interface(),the method nova.network.quantumv2.api.API.deallocate_port_for_instance() is called where the port is deleted.

def deallocate_port_for_instance(self, context, instance, port_id, conductor_api=None): try: quantumv2.get_client(context).delete_port(port_id) except Exception as ex: LOG.exception(_("Failed to delete quantum port %(port_id)s ") % locals())

This may be the problem.