diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java
new file mode 100644
index 0000000..fe07b9d
--- /dev/null
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackSwitchingHostProvider.java
@@ -0,0 +1,294 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.
+ */
+package org.onosproject.openstacknetworking.impl;
+
+import com.google.common.base.Strings;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
+import org.onlab.util.Tools;
+import org.onosproject.core.CoreService;
+import org.onosproject.mastership.MastershipService;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.Device;
+import org.onosproject.net.Host;
+import org.onosproject.net.HostId;
+import org.onosproject.net.HostLocation;
+import org.onosproject.net.Port;
+import org.onosproject.net.device.DeviceEvent;
+import org.onosproject.net.device.DeviceListener;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.host.DefaultHostDescription;
+import org.onosproject.net.host.HostDescription;
+import org.onosproject.net.host.HostProvider;
+import org.onosproject.net.host.HostProviderRegistry;
+import org.onosproject.net.host.HostProviderService;
+import org.onosproject.net.host.HostService;
+import org.onosproject.net.provider.AbstractProvider;
+import org.onosproject.net.provider.ProviderId;
+import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
+import org.onosproject.openstacknode.OpenstackNode;
+import org.onosproject.openstacknode.OpenstackNodeEvent;
+import org.onosproject.openstacknode.OpenstackNodeListener;
+import org.onosproject.openstacknode.OpenstackNodeService;
+import org.openstack4j.model.network.Network;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.stream.Collectors;
+
+import static org.onlab.util.Tools.groupedThreads;
+import static org.onosproject.net.AnnotationKeys.PORT_NAME;
+import static org.onosproject.openstacknetworking.api.Constants.*;
+import static org.onosproject.openstacknetworking.impl.HostBasedInstancePort.ANNOTATION_CREATE_TIME;
+import static org.onosproject.openstacknetworking.impl.HostBasedInstancePort.ANNOTATION_NETWORK_ID;
+import static org.onosproject.openstacknetworking.impl.HostBasedInstancePort.ANNOTATION_PORT_ID;
+
+@Service
+@Component(immediate = true)
+public final class OpenstackSwitchingHostProvider extends AbstractProvider implements HostProvider {
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    private static final String PORT_NAME_PREFIX_VM = "tap";
+    private static final String ERR_ADD_HOST = "Failed to add host: ";
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DeviceService deviceService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected HostProviderRegistry hostProviderRegistry;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected HostService hostService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected MastershipService mastershipService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected OpenstackNetworkService osNetworkService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected OpenstackNodeService osNodeService;
+
+    private final ExecutorService deviceEventExecutor =
+            Executors.newSingleThreadExecutor(groupedThreads("openstacknetworking", "device-event"));
+    private final ExecutorService configEventExecutor =
+            Executors.newSingleThreadExecutor(groupedThreads("openstacknetworking", "config-event"));
+    private final InternalDeviceListener internalDeviceListener = new InternalDeviceListener();
+    private final InternalOpenstackNodeListener internalNodeListener = new InternalOpenstackNodeListener();
+
+    private HostProviderService hostProvider;
+
+    /**
+     * Creates OpenStack switching host provider.
+     */
+    public OpenstackSwitchingHostProvider() {
+        super(new ProviderId("host", OPENSTACK_NETWORKING_APP_ID));
+    }
+
+    @Activate
+    protected void activate() {
+        coreService.registerApplication(OPENSTACK_NETWORKING_APP_ID);
+        deviceService.addListener(internalDeviceListener);
+        osNodeService.addListener(internalNodeListener);
+        hostProvider = hostProviderRegistry.register(this);
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        hostProviderRegistry.unregister(this);
+        osNodeService.removeListener(internalNodeListener);
+        deviceService.removeListener(internalDeviceListener);
+
+        deviceEventExecutor.shutdown();
+        configEventExecutor.shutdown();
+
+        log.info("Stopped");
+    }
+
+    @Override
+    public void triggerProbe(Host host) {
+        // no probe is required
+    }
+
+    private void processPortAdded(Port port) {
+        // TODO check the node state is COMPLETE
+        org.openstack4j.model.network.Port osPort = osNetworkService.port(port);
+        if (osPort == null) {
+            log.warn(ERR_ADD_HOST + "OpenStack port for {} not found", port);
+            return;
+        }
+
+        Network osNet = osNetworkService.network(osPort.getNetworkId());
+        if (osNet == null) {
+            log.warn(ERR_ADD_HOST + "OpenStack network {} not found",
+                    osPort.getNetworkId());
+            return;
+        }
+
+        if (osPort.getFixedIps().isEmpty()) {
+            log.warn(ERR_ADD_HOST + "no fixed IP for port {}", osPort.getId());
+            return;
+        }
+
+        MacAddress macAddr = MacAddress.valueOf(osPort.getMacAddress());
+        Set<IpAddress> fixedIps = osPort.getFixedIps().stream()
+                .map(ip -> IpAddress.valueOf(ip.getIpAddress()))
+                .collect(Collectors.toSet());
+        ConnectPoint connectPoint = new ConnectPoint(port.element().id(), port.number());
+
+        DefaultAnnotations.Builder annotations = DefaultAnnotations.builder()
+                .set(ANNOTATION_NETWORK_ID, osPort.getNetworkId())
+                .set(ANNOTATION_PORT_ID, osPort.getId())
+                .set(ANNOTATION_CREATE_TIME, String.valueOf(System.currentTimeMillis()));
+
+        HostDescription hostDesc = new DefaultHostDescription(
+                macAddr,
+                VlanId.NONE,
+                new HostLocation(connectPoint, System.currentTimeMillis()),
+                fixedIps,
+                annotations.build());
+
+        HostId hostId = HostId.hostId(macAddr);
+        hostProvider.hostDetected(hostId, hostDesc, false);
+    }
+
+    private void processPortRemoved(Port port) {
+        ConnectPoint connectPoint = new ConnectPoint(port.element().id(), port.number());
+        hostService.getConnectedHosts(connectPoint).forEach(host -> {
+                    hostProvider.hostVanished(host.id());
+                });
+    }
+
+    private class InternalDeviceListener implements DeviceListener {
+
+        @Override
+        public boolean isRelevant(DeviceEvent event) {
+            Device device = event.subject();
+            if (!mastershipService.isLocalMaster(device.id())) {
+                // do not allow to proceed without mastership
+                return false;
+            }
+            Port port = event.port();
+            if (port == null) {
+                return false;
+            }
+            String portName = port.annotations().value(PORT_NAME);
+            if (Strings.isNullOrEmpty(portName) ||
+                    !portName.startsWith(PORT_NAME_PREFIX_VM)) {
+                // handles Nova created port event only
+                return false;
+            }
+            return true;
+        }
+
+        @Override
+        public void event(DeviceEvent event) {
+            switch (event.type()) {
+                case PORT_UPDATED:
+                    if (!event.port().isEnabled()) {
+                        deviceEventExecutor.execute(() -> {
+                            log.debug("Instance port {} is removed from {}",
+                                     event.port().annotations().value(PORT_NAME),
+                                     event.subject().id());
+                            processPortRemoved(event.port());
+                        });
+                    } else if (event.port().isEnabled()) {
+                        deviceEventExecutor.execute(() -> {
+                            log.debug("Instance Port {} is detected from {}",
+                                     event.port().annotations().value(PORT_NAME),
+                                     event.subject().id());
+                            processPortAdded(event.port());
+                        });
+                    }
+                    break;
+                case PORT_ADDED:
+                    deviceEventExecutor.execute(() -> {
+                        log.debug("Instance port {} is detected from {}",
+                                 event.port().annotations().value(PORT_NAME),
+                                 event.subject().id());
+                        processPortAdded(event.port());
+                    });
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+
+    private class InternalOpenstackNodeListener implements OpenstackNodeListener {
+
+        @Override
+        public void event(OpenstackNodeEvent event) {
+            OpenstackNode osNode = event.subject();
+            // TODO check leadership of the node and make only the leader process
+
+            switch (event.type()) {
+                case COMPLETE:
+                    deviceEventExecutor.execute(() -> {
+                        log.info("COMPLETE node {} is detected", osNode.hostname());
+                        processCompleteNode(event.subject());
+                    });
+                    break;
+                case INCOMPLETE:
+                    log.warn("{} is changed to INCOMPLETE state", osNode);
+                    break;
+                case INIT:
+                case DEVICE_CREATED:
+                default:
+                    break;
+            }
+        }
+
+        private void processCompleteNode(OpenstackNode osNode) {
+            deviceService.getPorts(osNode.intBridge()).stream()
+                    .filter(port -> port.annotations().value(PORT_NAME)
+                            .startsWith(PORT_NAME_PREFIX_VM) &&
+                            port.isEnabled())
+                    .forEach(port -> {
+                        log.debug("Instance port {} is detected from {}",
+                                  port.annotations().value(PORT_NAME),
+                                  osNode.hostname());
+                        processPortAdded(port);
+                    });
+
+            Tools.stream(hostService.getHosts())
+                    .filter(host -> deviceService.getPort(
+                            host.location().deviceId(),
+                            host.location().port()) == null)
+                    .forEach(host -> {
+                        log.info("Remove stale host {}", host.id());
+                        hostProvider.hostVanished(host.id());
+                });
+        }
+    }
+}