diff --git a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/Port.java b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/Port.java
index 753532f..91f36b9 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/Port.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/Port.java
@@ -10,6 +10,7 @@
  *
  */
 public interface Port {
+	public Long getDpid();
 	public Long getNumber();
 	public Long getHardwareAddress();
 	public String getDescription();
diff --git a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/PortImpl.java b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/PortImpl.java
index eb411f0..ca7cd25 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/PortImpl.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/PortImpl.java
@@ -30,6 +30,11 @@
 	}
 
 	@Override
+	public Long getDpid() {
+	    return sw.getDpid();
+	}
+
+	@Override
 	public Long getNumber() {
 		return number;
 	}