diff --git a/xos/synchronizer/steps/sync_vtn_service.py b/xos/synchronizer/steps/sync_vtn_service.py
new file mode 100644
index 0000000..e4d4b4f
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+++ b/xos/synchronizer/steps/sync_vtn_service.py
@@ -0,0 +1,227 @@
+
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+import os
+import requests
+import socket
+import sys
+import base64
+from synchronizers.vtn.vtnnetport import VTNNetwork, VTNPort
+from synchronizers.new_base.syncstep import SyncStep
+from synchronizers.new_base.modelaccessor import *
+from xos.logger import Logger, logging
+from requests.auth import HTTPBasicAuth
+
+logger = Logger(level=logging.INFO)
+
+# XXX should save and load this
+glo_saved_networks = {}
+glo_saved_ports = {}
+
+class SyncVTNService(SyncStep):
+    provides=[Service]
+    observes=Service
+    requested_interval=0
+
+    def __init__(self, **args):
+        SyncStep.__init__(self, **args)
+
+    def get_vtn_onos_app(self, vtn_service):
+        links = vtn_service.subscribed_links.all()
+        for link in links:
+            # We're looking for an ONOS App. It's the only ServiceInstance that VTN can be implemented on.
+            if link.provider_service_instance.leaf_model_name != "ONOSApp":
+                continue
+
+            # TODO: Rather than checking model name, check for the right interface
+            # NOTE: Deferred until new Tosca engine is in place.
+
+            #if not link.provider_service_interface:
+            #    logger.warning("Link %s does not have a provider_service_interface. Skipping" % link)
+            #    continue
+            #
+            #if link.provider_service_interface.interface_type.name != "onos_app_interface":
+            #    logger.warning("Link %s provider_service_interface type is not equal to onos_app_interface" % link)
+            #    continue
+
+            # cast from ServiceInstance to ONOSApp
+            app = link.provider_service_instance.leaf_model
+            return app
+
+        raise Exception("No ServiceInstanceLink from VTN Service to VTN ONOS App")
+
+    def get_vtn_endpoint(self, vtn_service):
+        """ Get connection info for the ONOS that is hosting the VTN ONOS App.
+
+            returns (hostname, port, auth)
+        """
+        app = self.get_vtn_onos_app(vtn_service)
+        # cast from Service to ONOSService
+        onos = app.owner.leaf_model
+        if not (onos.rest_hostname):
+            raise Exception("onos.rest_hostname is not set")
+        if not (onos.rest_port):
+            raise Exception("onos.rest_port is not set")
+        if not (onos.rest_password):
+            raise Exception("onos.rest_password is not set")
+        if not (onos.rest_username):
+            raise Exception("onos.rest_username is not set")
+        auth = HTTPBasicAuth(onos.rest_username, onos.rest_password)
+        return (onos.rest_hostname, onos.rest_port, auth)
+
+    def get_method(self, auth, url, id):
+        url_with_id = "%s/%s" % (url, id)
+        r = requests.get(url_with_id, auth=auth)
+        if (r.status_code==200):
+            method="PUT"
+            url = url_with_id
+            req_func = requests.put
+            exists=True
+        else:
+            method="POST"
+            req_func = requests.post
+            exists=False
+        return (exists, url, method, req_func)
+
+    def sync_service_networks(self, vtn_service):
+        (onos_hostname, onos_port, onos_auth) = self.get_vtn_endpoint(vtn_service)
+
+        valid_ids = []
+        for network in Network.objects.all():
+            network = VTNNetwork(network)
+
+            if not network.id:
+                continue
+
+            if (network.type=="PRIVATE") and (not network.providerNetworks):
+                logger.info("Skipping network %s because it has no relevant state" % network.id)
+                continue
+
+            valid_ids.append(network.id)
+
+            if (glo_saved_networks.get(network.id, None) != network.to_dict()):
+                (exists, url, method, req_func) = self.get_method(onos_auth, "http://%s:%d/onos/cordvtn/serviceNetworks" % (onos_hostname, onos_port), network.id)
+
+                logger.info("%sing VTN API for network %s" % (method, network.id))
+
+                logger.info("URL: %s" % url)
+
+                # clean the providerNetworks list
+                providerNetworks = [{"id": x["id"], "bidirectional": x["bidirectional"]} for x in network.providerNetworks]
+
+                data = {"ServiceNetwork": {"id": network.id,
+                        "type": network.type,
+                        "providerNetworks": providerNetworks} }
+                logger.info("DATA: %s" % str(data))
+
+                r=req_func(url, json=data, auth=onos_auth )
+                if (r.status_code in [200,201]):
+                    glo_saved_networks[network.id] = network.to_dict()
+                else:
+                    logger.error("Received error from vtn service (%d)" % r.status_code)
+
+
+        for network_id in glo_saved_networks.keys():
+            if network_id not in valid_ids:
+                logger.info("DELETEing VTN API for network %s" % network_id)
+
+                url = "http://%s:%d/onos/cordvtn/serviceNetworks/%s" % (onos_hostname, onos_port, network_id)
+                logger.info("URL: %s" % url)
+
+                r = requests.delete(url, auth=onos_auth )
+                if (r.status_code in [200,204]):
+                    del glo_saved_networks[network_id]
+                else:
+                    logger.error("Received error from vtn service (%d)" % r.status_code)
+
+    def sync_service_ports(self, vtn_service):
+        (onos_hostname, onos_port, onos_auth) = self.get_vtn_endpoint(vtn_service)
+
+        valid_ids = []
+        for port in Port.objects.all():
+            port = VTNPort(port)
+
+            if not port.id:
+                continue
+
+            if (not port.vlan_id) and (not port.floating_address_pairs):
+                logger.info("Skipping port %s because it has no relevant state" % port.id)
+                continue
+
+            valid_ids.append(port.id)
+
+            if (glo_saved_ports.get(port.id, None) != port.to_dict()):
+                (exists, url, method, req_func) = self.get_method(onos_auth, "http://%s:%d/onos/cordvtn/servicePorts" % (onos_hostname, onos_port), port.id)
+
+                logger.info("%sing VTN API for port %s" % (method, port.id))
+
+                logger.info("URL: %s" % url)
+
+                data = {"ServicePort": {"id": port.id,
+                        "vlan_id": port.vlan_id,
+                        "floating_address_pairs": port.floating_address_pairs} }
+                logger.info("DATA: %s" % str(data))
+
+                r=req_func(url, json=data, auth=onos_auth )
+                if (r.status_code in [200,201]):
+                    glo_saved_ports[port.id] = port.to_dict()
+                else:
+                    logger.error("Received error from vtn service (%d)" % r.status_code)
+
+        for port_id in glo_saved_ports.keys():
+            if port_id not in valid_ids:
+                logger.info("DELETEing VTN API for port %s" % port_id)
+
+                url = "http://%s:%d/onos/cordvtn/servicePorts/%s" % (onos_hostname, onos_port, port_id)
+                logger.info("URL: %s" % url)
+
+                r = requests.delete(url, auth=onos_auth )
+                if (r.status_code in [200,204]):
+                    del glo_saved_ports[port_id]
+                else:
+                    logger.error("Received error from vtn service (%d)" % r.status_code)
+
+    def call(self, **args):
+        global glo_saved_networks
+        global glo_saved_ports
+
+        vtn_service = VTNService.objects.all()
+        if not vtn_service:
+            raise Exception("No VTN Service")
+
+        vtn_service = vtn_service[0]
+
+        # TODO: We should check get_vtn_onos_app() and make sure that it has been synced, and that any necessary
+        #       attributes (netcfg, etc) is filled out.
+
+        if (vtn_service.resync):
+            # If the VTN app requested a full resync, clear our saved network
+            # so we will resync everything, then reset the 'resync' flag
+            glo_saved_networks = {}
+            glo_saved_ports = {}
+
+            vtn_service.resync = False
+            vtn_service.save()
+
+        if vtn_service.vtnAPIVersion>=2:
+            # version 2 means use new API
+            logger.info("Using New API")
+            self.sync_service_networks(vtn_service)
+            self.sync_service_ports(vtn_service)
+        else:
+            raise Exception("VTN API Version 1 is no longer supported by VTN Synchronizer")
+
+