diff --git a/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtap.java b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtap.java
new file mode 100644
index 0000000000..6f74e81edd
--- /dev/null
+++ b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtap.java
@@ -0,0 +1,160 @@
+/*
+ * Copyright 2018-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.
+ */
+package org.onosproject.openstackvtap.api;
+
+import org.onosproject.net.Annotated;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.SparseAnnotations;
+
+import java.util.Set;
+
+/**
+ * Abstraction of an OpenstackVtap.
+ */
+public interface OpenstackVtap extends Annotated {
+
+    /**
+     * Openstack vTap type.
+     */
+    enum Type {
+
+        /**
+         * Indicates mirroring both TX and RX traffic.
+         */
+        VTAP_ALL(0x3),
+
+        /**
+         * Indicates only mirroring RX traffic.
+         */
+        VTAP_RX(0x2),
+
+        /**
+         * Indicates only mirroring TX traffic.
+         */
+        VTAP_TX(0x1),
+
+        /**
+         * Indicates do not mirroring any traffic.
+         */
+        VTAP_NONE(0);
+
+        private final int type;
+
+        Type(int type) {
+            this.type = type;
+        }
+
+        public boolean isValid(Type comp) {
+            return (this.type & comp.type) == comp.type;
+        }
+    }
+
+    /**
+     * OpenstackVtap identifier.
+     *
+     * @return OpenstackVtap id
+     */
+    OpenstackVtapId id();
+
+    /**
+     * Returns OpenstackVtap type.
+     *
+     * @return type
+     */
+    Type type();
+
+    /**
+     * Returns the vTap criterion.
+     *
+     * @return vTap criterion
+     */
+    OpenstackVtapCriterion vTapCriterion();
+
+    /**
+     * Returns a collection of TX device identifiers.
+     *
+     * @return device identifiers
+     */
+    Set<DeviceId> txDeviceIds();
+
+    /**
+     * Returns a collection of RX device identifiers.
+     *
+     * @return device identifiers
+     */
+    Set<DeviceId> rxDeviceIds();
+
+    /**
+     * Builder of new openstack vTap instance.
+     */
+    interface Builder {
+
+        /**
+         * Returns openstack vTap builder with supplied vTap identifier.
+         *
+         * @param id vTap identifier
+         * @return openstack vTap builder
+         */
+        Builder id(OpenstackVtapId id);
+
+        /**
+         * Returns openstack vTap builder with supplied vTap type.
+         *
+         * @param type vTap type
+         * @return openstack vTap builder
+         */
+        Builder type(OpenstackVtap.Type type);
+
+        /**
+         * Returns openstack vTap builder with supplied vTap criterion.
+         *
+         * @param vTapCriterion vTap criterion
+         * @return openstack vTap builder
+         */
+        Builder vTapCriterion(OpenstackVtapCriterion vTapCriterion);
+
+        /**
+         * Returns openstack vTap builder with supplied TX device identifiers.
+         *
+         * @param txDeviceIds TX device identifiers
+         * @return openstack vTap builder
+         */
+        Builder txDeviceIds(Set<DeviceId> txDeviceIds);
+
+        /**
+         * Returns openstack vTap builder with supplied RX device identifiers.
+         *
+         * @param rxDeviceIds RX device identifiers
+         * @return openstack vTap builder
+         */
+        Builder rxDeviceIds(Set<DeviceId> rxDeviceIds);
+
+        /**
+         * Returns openstack vTap builder with supplied annotations.
+         *
+         * @param annotations a set of annotations
+         * @return openstack vTap builder
+         */
+        Builder annotations(SparseAnnotations... annotations);
+
+        /**
+         * Builds an immutable openstack vTap instance.
+         *
+         * @return openstack vTap instance
+         */
+        OpenstackVtap build();
+    }
+}
diff --git a/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapAdminService.java b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapAdminService.java
new file mode 100644
index 0000000000..da9fd2462d
--- /dev/null
+++ b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapAdminService.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2018-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.
+ */
+package org.onosproject.openstackvtap.api;
+
+import org.onlab.packet.VlanId;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+
+/**
+ * Service for administering the inventory of vTap.
+ */
+public interface OpenstackVtapAdminService extends OpenstackVtapService {
+
+    /**
+     * Creates a new vTap based on the specified description.
+     *
+     * @param type                  vTap type
+     * @param vTapCriterion         criterion of a vTap
+     * @return created vTap object or null if error occurred
+     */
+    OpenstackVtap createVtap(OpenstackVtap.Type type, OpenstackVtapCriterion vTapCriterion);
+
+    /**
+     * Updates the existing vTap based on the given vTap instance.
+     *
+     * @param vTapId             vTap identifier
+     * @param vTap               vTap instance to be modified
+     * @return updated vTap object or null if error occurred
+     */
+    OpenstackVtap updateVtap(OpenstackVtapId vTapId, OpenstackVtap vTap);
+
+    /**
+     * Removes the specified vTap with given vTap identifier.
+     *
+     * @param vTapId             vTap identifier
+     * @return removed vTap object or null if error occurred
+     */
+    OpenstackVtap removeVtap(OpenstackVtapId vTapId);
+
+    /**
+     * Sets output port and VLAN tag for vTap.
+     *
+     * @param deviceId           device identifier
+     * @param type               vTap type
+     * @param portNumber         port number
+     * @param vlanId             VLAN tag
+     */
+    void setVtapOutput(DeviceId deviceId, OpenstackVtap.Type type,
+                       PortNumber portNumber, VlanId vlanId);
+
+    /**
+     * Sets output port and VNI for vTap.
+     *
+     * @param deviceId          device identifier
+     * @param type              vTap type
+     * @param portNumber        port number
+     * @param vni               virtual network index (VNI) of VxLAN
+     */
+    void setVtapOutput(DeviceId deviceId, OpenstackVtap.Type type,
+                       PortNumber portNumber, int vni);
+}
diff --git a/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapCriterion.java b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapCriterion.java
new file mode 100644
index 0000000000..eb21b0c4dc
--- /dev/null
+++ b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapCriterion.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2018-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.
+ */
+package org.onosproject.openstackvtap.api;
+
+import org.onlab.packet.IpPrefix;
+import org.onlab.packet.TpPort;
+
+/**
+ * A vTAP criterion used for mirroring traffic.
+ */
+public interface OpenstackVtapCriterion {
+
+    /**
+     * Returns IP Prefix of Source VM.
+     *
+     * @return source IP prefix
+     */
+    IpPrefix srcIpPrefix();
+
+    /**
+     * Returns IP Prefix of Destination VM.
+     *
+     * @return destination IP prefix
+     */
+    IpPrefix dstIpPrefix();
+
+    /**
+     * Returns IP protocol.
+     *
+     * @return IP protocol
+     */
+    byte ipProtocol();
+
+    /**
+     * Returns source transport port.
+     *
+     * @return source transport port number
+     */
+
+    TpPort srcTpPort();
+
+    /**
+     * Returns destination transport port.
+     *
+     * @return destination transport port number
+     */
+    TpPort dstTpPort();
+
+    /**
+     * Builder of new openstack vTap criteria.
+     */
+    interface Builder {
+
+        /**
+         * Builds an immutable openstack vTap criterion instance.
+         *
+         * @return openstack vTap criterion
+         */
+        OpenstackVtapCriterion build();
+
+        /**
+         * Returns openstack vTap criterion builder with supplied srcIpPrefix.
+         *
+         * @param srcIpPrefix Source IP address
+         * @return openstack vTap criterion builder
+         */
+        Builder srcIpPrefix(IpPrefix srcIpPrefix);
+
+        /**
+         * Returns openstack vTap criterion builder with supplied srcIpPrefix.
+         *
+         * @param dstIpPrefix Destination IP Prefix
+         * @return openstack vTap criterion builder
+         */
+        Builder dstIpPrefix(IpPrefix dstIpPrefix);
+
+        /**
+         * Returns openstack vTap criterion builder with supplied ipProtocol.
+         *
+         * @param ipProtocol IP protocol number
+         * @return openstack vTap criterion builder
+         */
+        Builder ipProtocol(byte ipProtocol);
+
+        /**
+         * Returns openstack vTap criterion builder with supplied srcTpPort.
+         *
+         * @param srcTpPort Source transport port number
+         * @return openstack vTap criterion builder
+         */
+        Builder srcTpPort(TpPort srcTpPort);
+
+        /**
+         * Returns openstack vTap criterion builder with supplied dstTpPort.
+         *
+         * @param dstTpPort Destination transport port number
+         * @return openstack vTap criterion builder
+         */
+        Builder dstTpPort(TpPort dstTpPort);
+    }
+}
diff --git a/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapEvent.java b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapEvent.java
new file mode 100644
index 0000000000..70c1e11571
--- /dev/null
+++ b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapEvent.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2018-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.
+ */
+package org.onosproject.openstackvtap.api;
+
+import org.onlab.util.Tools;
+import org.onosproject.event.AbstractEvent;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+/**
+ * Describes vTap event.
+ */
+public class OpenstackVtapEvent extends AbstractEvent<OpenstackVtapEvent.Type, OpenstackVtap> {
+
+    /**
+     * Type of vTap events.
+     */
+    public enum Type {
+
+        /**
+         * Signifies that a new vTap has been added.
+         */
+        VTAP_ADDED,
+
+        /**
+         * Signifies that a vTap has been removed.
+         */
+        VTAP_REMOVED,
+
+        /**
+         * Signifies that a vTap data changed.
+         */
+        VTAP_UPDATED,
+    }
+
+    private OpenstackVtap prevSubject;
+
+    /**
+     * Creates an event of a given type and for the specified vTap and the
+     * current time.
+     *
+     * @param type vTap event type
+     * @param vTap event vTap subject
+     */
+    public OpenstackVtapEvent(Type type, OpenstackVtap vTap) {
+        super(type, vTap);
+    }
+
+    /**
+     * Creates an event of a given type and for the specified vTap and time.
+     *
+     * @param type vTap event type
+     * @param vTap event vTap subject
+     * @param time occurrence time
+     */
+    public OpenstackVtapEvent(Type type, OpenstackVtap vTap, long time) {
+        super(type, vTap, time);
+    }
+
+    /**
+     * Creates an event with previous subject.
+     *
+     * The previous subject is ignored if the type is not moved or updated
+     *
+     * @param type vTap event type
+     * @param vTap event vTap subject
+     * @param prevSubject previous vTap subject
+     */
+    public OpenstackVtapEvent(Type type, OpenstackVtap vTap, OpenstackVtap prevSubject) {
+        super(type, vTap);
+        if (type == Type.VTAP_UPDATED) {
+            this.prevSubject = prevSubject;
+        }
+    }
+
+    /**
+     * Gets the previous subject in this vTap event.
+     *
+     * @return the previous subject, or null if previous subject is not
+     *         specified.
+     */
+    public OpenstackVtap prevSubject() {
+        return this.prevSubject;
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this)
+                .add("time", Tools.defaultOffsetDataTime(time()))
+                .add("type", type())
+                .add("subject", subject())
+                .add("prevSubject", prevSubject())
+                .toString();
+    }
+}
diff --git a/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapId.java b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapId.java
new file mode 100644
index 0000000000..ce8945dfb9
--- /dev/null
+++ b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapId.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2018-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.
+ */
+package org.onosproject.openstackvtap.api;
+
+import java.util.Objects;
+import java.util.UUID;
+
+/**
+ * Immutable representation of an openstack vTap identifier.
+ */
+public final class OpenstackVtapId {
+
+    /**
+     * Represents either no vTap, or an unspecified vTap.
+     */
+    public static final OpenstackVtapId NONE = new OpenstackVtapId(null);
+
+    private final UUID uuid;
+
+    // Public construction is prohibited
+    private OpenstackVtapId(UUID uuid) {
+        this.uuid = uuid;
+    }
+
+    // Default constructor for serialization
+    private OpenstackVtapId() {
+        this.uuid = null;
+    }
+
+    /**
+     * Returns an unique UUID.
+     *
+     * @return UUID
+     */
+    public UUID uuid() {
+        return uuid;
+    }
+
+    /**
+     * Creates a vTap identifier using the supplied UUID.
+     *
+     * @param uuid vTap UUID
+     * @return vTap identifier
+     */
+    public static OpenstackVtapId vTapId(UUID uuid) {
+        return new OpenstackVtapId(uuid);
+    }
+
+    /**
+     * Creates a vTap identifier using the supplied string format of UUID.
+     *
+     * @param uuidString vTap UUID
+     * @return vTap identifier
+     */
+    public static OpenstackVtapId vTapId(String uuidString) {
+        try {
+            return vTapId(UUID.fromString(uuidString));
+        } catch (Exception e) {
+            throw new IllegalArgumentException("Invalid UUID string: " + uuidString);
+        }
+    }
+
+    /**
+     * Creates a OpenstackVtap id using random uuid.
+     *
+     * @return OpenstackVtap identifier
+     */
+    public static OpenstackVtapId vTapId() {
+        return new OpenstackVtapId(UUID.randomUUID());
+    }
+
+    @Override
+    public String toString() {
+        return uuid.toString();
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(uuid);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof OpenstackVtapId) {
+            final OpenstackVtapId other = (OpenstackVtapId) obj;
+            return Objects.equals(this.uuid, other.uuid);
+        }
+        return false;
+    }
+}
diff --git a/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapListener.java b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapListener.java
new file mode 100644
index 0000000000..ebea5edd27
--- /dev/null
+++ b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapListener.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2018-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.
+ */
+package org.onosproject.openstackvtap.api;
+
+import org.onosproject.event.EventListener;
+
+/**
+ * Entity capable of receiving user related events.
+ */
+public interface OpenstackVtapListener extends EventListener<OpenstackVtapEvent> {
+}
diff --git a/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapService.java b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapService.java
index f9d8fee892..5041aafa96 100644
--- a/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapService.java
+++ b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapService.java
@@ -15,13 +15,47 @@
  */
 package org.onosproject.openstackvtap.api;
 
+import org.onosproject.event.ListenerService;
+import org.onosproject.net.DeviceId;
+
+import java.util.Set;
+
 /**
- * Openstack vtap interface.
+ * Service for interacting with the inventory of vTap.
  */
-public interface OpenstackVtapService {
+public interface OpenstackVtapService
+        extends ListenerService<OpenstackVtapEvent, OpenstackVtapListener> {
 
     /**
-     * A dummy method.
+     * Returns the number of vTaps in the store.
+     *
+     * @param type               vTap type
+     * @return vTap count
      */
-    void dummy();
+    int getVtapCount(OpenstackVtap.Type type);
+
+    /**
+     * Returns a collection of selected vTaps in the store.
+     *
+     * @param type               vTap type
+     * @return iterable collection of selected vTaps
+     */
+    Set<OpenstackVtap> getVtaps(OpenstackVtap.Type type);
+
+    /**
+     * Returns the vTap with the specified identifier.
+     *
+     * @param vTapId             vTap identifier
+     * @return vTap or null if not exist
+     */
+    OpenstackVtap getVtap(OpenstackVtapId vTapId);
+
+    /**
+     * Returns a collection of vTaps which are associated with the given device.
+     *
+     * @param type               vTap type
+     * @param deviceId           device identifier
+     * @return a set of vTaps
+     */
+    Set<OpenstackVtap> getVtapsByDeviceId(OpenstackVtap.Type type, DeviceId deviceId);
 }
diff --git a/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapStore.java b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapStore.java
new file mode 100644
index 0000000000..15c945e2b7
--- /dev/null
+++ b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapStore.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2018-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.
+ */
+package org.onosproject.openstackvtap.api;
+
+import org.onosproject.net.DeviceId;
+import org.onosproject.store.Store;
+
+import java.util.Set;
+
+/**
+ * Manages inventory of OpenstackVtap states; not intended for direct use.
+ */
+public interface OpenstackVtapStore
+        extends Store<OpenstackVtapEvent, OpenstackVtapStoreDelegate> {
+
+    /**
+     * Creates a new vTap or updates the existing one based on the specified
+     * description.
+     *
+     * @param vTapId             vTap identifier
+     * @param description        vTap description data
+     * @param replaceFlag        replace device set if true, merge device set otherwise
+     * @return created or updated vTap object or null if error occurred
+     */
+    OpenstackVtap createOrUpdateVtap(OpenstackVtapId vTapId, OpenstackVtap description, boolean replaceFlag);
+
+    /**
+     * Removes the specified vTap from the inventory by the given vTap identifier.
+     *
+     * @param vTapId             vTap identifier
+     * @return removed vTap object or null if error occurred
+     */
+    OpenstackVtap removeVtapById(OpenstackVtapId vTapId);
+
+    /**
+     * Adds the specified device id from the vTap entry.
+     *
+     * @param vTapId             vTap identification
+     * @param type               vTap type
+     * @param deviceId           device identifier to be added
+     * @return true on success, false otherwise
+     */
+    boolean addDeviceToVtap(OpenstackVtapId vTapId, OpenstackVtap.Type type, DeviceId deviceId);
+
+    /**
+     * Removes the specified device id from the vTap entry.
+     *
+     * @param vTapId             vTap identification
+     * @param type               vTap type
+     * @param deviceId           device identifier to be removed
+     * @return true on success, false otherwise
+     */
+    boolean removeDeviceFromVtap(OpenstackVtapId vTapId, OpenstackVtap.Type type, DeviceId deviceId);
+
+    /**
+     * Adds the specified device id from the vTap entry.
+     *
+     * @param vTapId             vTap identification
+     * @param txDeviceIds        TX device identifiers to be updated
+     * @param rxDeviceIds        RX device identifiers to be updated
+     * @param replaceFlag        replace device set if true, merge device set otherwise
+     * @return true on success, false otherwise
+     */
+    boolean updateDeviceForVtap(OpenstackVtapId vTapId, Set<DeviceId> txDeviceIds,
+                                Set<DeviceId> rxDeviceIds, boolean replaceFlag);
+
+    /**
+     * Returns the number of vTaps in the store.
+     *
+     * @param type               vTap type
+     * @return vTap count
+     */
+    int getVtapCount(OpenstackVtap.Type type);
+
+    /**
+     * Returns a collection of selected vTaps in the store.
+     *
+     * @param type               vTap type
+     * @return iterable collection of selected vTaps
+     */
+    Set<OpenstackVtap> getVtaps(OpenstackVtap.Type type);
+
+    /**
+     * Returns the vTap with the specified identifier.
+     *
+     * @param vTapId             vTap identifier
+     * @return vtap or null if not found
+     */
+    OpenstackVtap getVtap(OpenstackVtapId vTapId);
+
+    /**
+     * Returns the set of vTaps whose included on device.
+     *
+     * @param type               vTap type
+     * @param deviceId           device identifier
+     * @return set of vTaps
+     */
+    Set<OpenstackVtap> getVtapsByDeviceId(OpenstackVtap.Type type, DeviceId deviceId);
+}
diff --git a/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapStoreDelegate.java b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapStoreDelegate.java
new file mode 100644
index 0000000000..0a783bd19c
--- /dev/null
+++ b/apps/openstackvtap/api/src/main/java/org/onosproject/openstackvtap/api/OpenstackVtapStoreDelegate.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2018-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.
+ */
+package org.onosproject.openstackvtap.api;
+
+import org.onosproject.store.StoreDelegate;
+
+/**
+ * OpenstackVtap store delegate abstraction.
+ */
+public interface OpenstackVtapStoreDelegate extends StoreDelegate<OpenstackVtapEvent> {
+}
diff --git a/apps/openstackvtap/app/pom.xml b/apps/openstackvtap/app/pom.xml
index 800c3ed622..f8b40b4241 100644
--- a/apps/openstackvtap/app/pom.xml
+++ b/apps/openstackvtap/app/pom.xml
@@ -156,6 +156,12 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-core-serializers</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
         <dependency>
             <groupId>org.onosproject</groupId>
             <artifactId>onos-rest</artifactId>
diff --git a/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/impl/OpenstackVtapManager.java b/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/impl/OpenstackVtapManager.java
index 6a7e681546..a7c4de78b1 100644
--- a/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/impl/OpenstackVtapManager.java
+++ b/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/impl/OpenstackVtapManager.java
@@ -15,14 +15,44 @@
  */
 package org.onosproject.openstackvtap.impl;
 
+import org.onosproject.net.DeviceId;
+import org.onosproject.openstackvtap.api.OpenstackVtap;
+import org.onosproject.openstackvtap.api.OpenstackVtapId;
+import org.onosproject.openstackvtap.api.OpenstackVtapListener;
 import org.onosproject.openstackvtap.api.OpenstackVtapService;
 
+import java.util.Set;
+
 /**
  * Implementation of openstack vtap.
  */
 public class OpenstackVtapManager implements OpenstackVtapService {
 
     @Override
-    public void dummy() {
+    public int getVtapCount(OpenstackVtap.Type type) {
+        return 0;
+    }
+
+    @Override
+    public Set<OpenstackVtap> getVtaps(OpenstackVtap.Type type) {
+        return null;
+    }
+
+    @Override
+    public OpenstackVtap getVtap(OpenstackVtapId vTapId) {
+        return null;
+    }
+
+    @Override
+    public Set<OpenstackVtap> getVtapsByDeviceId(OpenstackVtap.Type type, DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public void addListener(OpenstackVtapListener listener) {
+    }
+
+    @Override
+    public void removeListener(OpenstackVtapListener listener) {
     }
 }