diff --git a/src/main/java/net/floodlightcontroller/core/IOF13Switch.java b/src/main/java/net/floodlightcontroller/core/IOF13Switch.java
index 9e1b95a..b8251e5 100644
--- a/src/main/java/net/floodlightcontroller/core/IOF13Switch.java
+++ b/src/main/java/net/floodlightcontroller/core/IOF13Switch.java
@@ -7,6 +7,7 @@
 
 import net.onrc.onos.core.matchaction.MatchActionOperationEntry;
 import net.onrc.onos.core.util.Dpid;
+import net.onrc.onos.core.util.PortNumber;
 
 import com.google.common.primitives.Longs;
 
@@ -107,5 +108,8 @@
      */
     public int getEcmpGroupId(NeighborSet ns);
 
+    public void removePortFromGroups(PortNumber port);
+
+    public void addPortToGroups(PortNumber port);
 
 }