diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/util/OpenstackNetworkingUtil.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/util/OpenstackNetworkingUtil.java
index 9ece612..0253e4d 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/util/OpenstackNetworkingUtil.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/util/OpenstackNetworkingUtil.java
@@ -21,6 +21,7 @@
 import com.google.common.base.Strings;
 import org.onosproject.cfg.ConfigProperty;
 import org.onosproject.net.DeviceId;
+import org.onosproject.net.device.DeviceService;
 import org.onosproject.openstacknetworking.api.InstancePort;
 import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
 import org.onosproject.openstacknetworking.api.OpenstackRouterAdminService;
@@ -56,12 +57,15 @@
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.TreeMap;
 
 import static com.fasterxml.jackson.databind.SerializationFeature.INDENT_OUTPUT;
+import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.base.Strings.isNullOrEmpty;
+import static org.onosproject.net.AnnotationKeys.PORT_NAME;
 import static org.onosproject.openstacknetworking.api.Constants.PCISLOT;
 import static org.onosproject.openstacknetworking.api.Constants.PCI_VENDOR_INFO;
 import static org.onosproject.openstacknetworking.api.Constants.portNamePrefixMap;
@@ -289,8 +293,6 @@
      * @return interface name
      */
     public static String getIntfNameFromPciAddress(Port port) {
-
-
         if (port.getProfile() == null || port.getProfile().isEmpty()) {
             log.error("Port profile is not found");
             return null;
@@ -337,6 +339,22 @@
     }
 
     /**
+     * Check if the given interface is added to the given device or not.
+     *
+     * @param deviceId device ID
+     * @param intfName interface name
+     * @param deviceService device service
+     * @return true if the given interface is added to the given device or false otherwise
+     */
+    public static boolean hasIntfAleadyInDevice(DeviceId deviceId, String intfName, DeviceService deviceService) {
+        checkNotNull(deviceId);
+        checkNotNull(intfName);
+
+        return deviceService.getPorts(deviceId).stream()
+                .anyMatch(port -> Objects.equals(port.annotations().value(PORT_NAME), intfName));
+    }
+
+    /**
      * Adds router interfaces to openstack admin service.
      * TODO fix the logic to add router interface to router
      *