def _load_nexus_cfg_driver(self):
        """Load Nexus Config driver.
        :raises SystemExit of 1 if driver cannot be loaded
        """

        try:
            loaded_class = runtime_utils.load_class_by_alias_or_classname(
                'networking_cisco.ml2.nexus_driver', 'restapi')
            return loaded_class(CONF.ml2_cisco.nexus_switches)
        except ImportError:
            LOG.error("Error loading Nexus Config driver 'restapi'")
            raise SystemExit(1)