diff --git a/net/api/src/main/java/org/onlab/onos/net/DefaultPort.java b/net/api/src/main/java/org/onlab/onos/net/DefaultPort.java
new file mode 100644
index 0000000..56a2979
--- /dev/null
+++ b/net/api/src/main/java/org/onlab/onos/net/DefaultPort.java
@@ -0,0 +1,70 @@
+package org.onlab.onos.net;
+
+import java.util.Objects;
+
+import static com.google.common.base.Objects.toStringHelper;
+
+/**
+ * Default port implementation.
+ */
+public class DefaultPort implements Port {
+
+    private final Element element;
+    private final PortNumber number;
+    private final boolean isEnabled;
+
+    /**
+     * Creates a network element attributed to the specified provider.
+     *
+     * @param element   parent network element
+     * @param number    port number
+     * @param isEnabled indicator whether the port is up and active
+     */
+    public DefaultPort(Element element, PortNumber number,
+                       boolean isEnabled) {
+        this.element = element;
+        this.number = number;
+        this.isEnabled = isEnabled;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(number, isEnabled);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof DefaultPort) {
+            final DefaultPort other = (DefaultPort) obj;
+            return Objects.equals(this.element.id(), other.element.id()) &&
+                    Objects.equals(this.number, other.number) &&
+                    Objects.equals(this.isEnabled, other.isEnabled);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this)
+                .add("element", element.id())
+                .add("number", number)
+                .add("isEnabled", isEnabled)
+                .toString();
+    }
+
+    @Override
+    public PortNumber number() {
+        return number;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return isEnabled;
+    }
+
+    @Override
+    public Element element() {
+        return element;
+    }
+
+}
diff --git a/net/api/src/main/java/org/onlab/onos/net/Port.java b/net/api/src/main/java/org/onlab/onos/net/Port.java
index cf9a2ce..e98278b 100644
--- a/net/api/src/main/java/org/onlab/onos/net/Port.java
+++ b/net/api/src/main/java/org/onlab/onos/net/Port.java
@@ -20,11 +20,11 @@
     boolean isEnabled();
 
     /**
-     * Returns the identifier of the network element to which this port belongs.
+     * Returns the parent network element to which this port belongs.
      *
      * @return parent network element
      */
-    Element parent();
+    Element element();
 
     // set of port attributes
 
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;
     }
 
 }