diff --git a/net/api/src/main/java/org/onlab/onos/net/device/DeviceEvent.java b/net/api/src/main/java/org/onlab/onos/net/device/DeviceEvent.java
index 984f575..10b3b19 100644
--- a/net/api/src/main/java/org/onlab/onos/net/device/DeviceEvent.java
+++ b/net/api/src/main/java/org/onlab/onos/net/device/DeviceEvent.java
@@ -2,12 +2,15 @@
 
 import org.onlab.onos.event.AbstractEvent;
 import org.onlab.onos.net.Device;
+import org.onlab.onos.net.Port;
 
 /**
  * Describes infrastructure device event.
  */
 public class DeviceEvent extends AbstractEvent<DeviceEvent.Type, Device> {
 
+    private final Port port;
+
     /**
      * Type of device events.
      */
@@ -42,7 +45,22 @@
          * Signifies that the current controller instance relationship has
          * changed with respect to a device.
          */
-        DEVICE_MASTERSHIP_CHANGED
+        DEVICE_MASTERSHIP_CHANGED,
+
+        /**
+         * Signifies that a port has been added.
+         */
+        PORT_ADDED,
+
+        /**
+         * Signifies that a port has been updated.
+         */
+        PORT_UPDATED,
+
+        /**
+         * Signifies that a port has been removed.
+         */
+        PORT_REMOVED
     }
 
     /**
@@ -53,7 +71,20 @@
      * @param device event device subject
      */
     public DeviceEvent(Type type, Device device) {
+        this(type, device, null);
+    }
+
+    /**
+     * Creates an event of a given type and for the specified device, port
+     * and the current time.
+     *
+     * @param type   device event type
+     * @param device event device subject
+     * @param port   optional port subject
+     */
+    public DeviceEvent(Type type, Device device, Port port) {
         super(type, device);
+        this.port = port;
     }
 
     /**
@@ -61,10 +92,21 @@
      *
      * @param type   device event type
      * @param device event device subject
+     * @param port   optional port subject
      * @param time   occurrence time
      */
-    public DeviceEvent(Type type, Device device, long time) {
+    public DeviceEvent(Type type, Device device, Port port, long time) {
         super(type, device, time);
+        this.port = port;
+    }
+
+    /**
+     * Returns the port subject.
+     *
+     * @return port subject or null if the event is not port specific.
+     */
+    Port port() {
+        return port;
     }
 
 }