tosca sample for external vtn
diff --git a/xos/tosca/samples/vtn-external.yaml b/xos/tosca/samples/vtn-external.yaml
new file mode 100644
index 0000000..ee41ac8
--- /dev/null
+++ b/xos/tosca/samples/vtn-external.yaml
@@ -0,0 +1,31 @@
+tosca_definitions_version: tosca_simple_yaml_1_0
+
+description: Setup CORD-related services -- vOLT, vCPE, vBNG.
+
+imports:
+   - custom_types/xos.yaml
+
+topology_template:
+  node_templates:
+    service_ONOS_VTN:
+      type: tosca.nodes.ONOSService
+      requirements:
+      properties:
+          kind: onos
+          view_url: /admin/onos/onosservice/$id$/
+          no_container: true
+          rest_hostname: ctl.smbaker-xos-neu.xos-pg0.clemson.cloudlab.us
+
+    VTN_ONOS_app:
+      type: tosca.nodes.ONOSVTNApp
+      requirements:
+          - onos_tenant:
+              node: service_ONOS_VTN
+              relationship: tosca.relationships.TenantOfService
+      properties:
+          dependencies: org.onosproject.drivers, org.onosproject.drivers.ovsdb, org.onosproject.lldpprovider, org.onosproject.openflow-base, org.onosproject.ovsdb-base, org.onosproject.dhcp, org.onosproject.openstackswitching, org.onosproject.cordvtn
+          rest_onos/v1/network/configuration/: { get_artifact: [ SELF, vtn_network_cfg_json, LOCAL_FILE ] }
+      artifacts:
+          vtn_network_cfg_json: /root/setup/vtn-network-cfg.json
+
+