diff --git a/xos-services/vtn-service/templates/_tosca.tpl b/xos-services/vtn-service/templates/_tosca.tpl
index 49f0ba8..32f765d 100644
--- a/xos-services/vtn-service/templates/_tosca.tpl
+++ b/xos-services/vtn-service/templates/_tosca.tpl
@@ -18,7 +18,10 @@
 tosca_definitions_version: tosca_simple_yaml_1_0
 
 imports:
-   - custom_types/vtnservice.yaml
+  - custom_types/servicedependency.yaml
+  - custom_types/serviceinstance.yaml
+  - custom_types/serviceinstanceattribute.yaml
+  - custom_types/vtnservice.yaml
 
 description: Configures the VTN ONOS service
 
@@ -43,4 +46,23 @@
           vtnAPIVersion: 2
           controllerPort: onos-cord-openflow:6653
           resync: false
+
+    vtn_service_instance:
+      type: tosca.nodes.ServiceInstance
+      properties:
+          name: VTN config
+      requirements:
+        - owner:
+            node: service#vtn
+            relationship: tosca.relationships.BelongsToOne
+
+    vtn_config:
+        type: tosca.nodes.ServiceInstanceAttribute
+        properties:
+            name: autogenerate
+            value: vtn-network-cfg
+        requirements:
+          - service_instance:
+              node: vtn_service_instance
+              relationship: tosca.relationships.BelongsToOne
 {{- end -}}