diff --git a/neutron/extensions/routerservicetype.py b/neutron/extensions/routerservicetype.py
index 5e4ffbfb3a8..4749c6d9b6e 100644
--- a/neutron/extensions/routerservicetype.py
+++ b/neutron/extensions/routerservicetype.py
@@ -12,39 +12,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import routerservicetype as apidef
 from neutron_lib.api import extensions
 
-SERVICE_TYPE_ID = 'service_type_id'
-EXTENDED_ATTRIBUTES_2_0 = {
-    'routers': {
-        SERVICE_TYPE_ID: {'allow_post': True, 'allow_put': False,
-                          'validate': {'type:uuid_or_none': None},
-                          'default': None, 'is_visible': True},
-    }
-}
 
-
-class Routerservicetype(extensions.ExtensionDescriptor):
+class Routerservicetype(extensions.APIExtensionDescriptor):
     """Extension class supporting router service type."""
 
-    @classmethod
-    def get_name(cls):
-        return "Router Service Type"
-
-    @classmethod
-    def get_alias(cls):
-        return "router-service-type"
-
-    @classmethod
-    def get_description(cls):
-        return "Provides router service type"
-
-    @classmethod
-    def get_updated(cls):
-        return "2013-01-29T00:00:00-00:00"
-
-    def get_extended_resources(self, version):
-        if version == "2.0":
-            return EXTENDED_ATTRIBUTES_2_0
-        else:
-            return {}
+    api_definition = apidef