diff --git a/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/util/IterableIterator.java b/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/util/IterableIterator.java
new file mode 100644
index 0000000..a59b244
--- /dev/null
+++ b/of/ctl/src/main/java/org/onlab/onos/of/controller/impl/util/IterableIterator.java
@@ -0,0 +1,68 @@
+/**
+ *    Copyright 2012 Big Switch Networks, Inc.
+ *    Originally created by David Erickson, Stanford University
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *    not use this file except in compliance with the License. You may obtain
+ *    a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ *    License for the specific language governing permissions and limitations
+ *    under the License.
+ **/
+
+package org.onlab.onos.of.controller.impl.util;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+/**
+ * Iterator over all values in an iterator of iterators.
+ *
+ * @param <T> the type of elements returned by this iterator
+ */
+public class IterableIterator<T> implements Iterator<T> {
+    Iterator<? extends Iterable<T>> subIterator;
+    Iterator<T> current = null;
+
+    public IterableIterator(Iterator<? extends Iterable<T>> subIterator) {
+        super();
+        this.subIterator = subIterator;
+    }
+
+    @Override
+    public boolean hasNext() {
+        if (current == null) {
+            if (subIterator.hasNext()) {
+                current = subIterator.next().iterator();
+            } else {
+                return false;
+            }
+        }
+        while (!current.hasNext() && subIterator.hasNext()) {
+            current = subIterator.next().iterator();
+        }
+
+        return current.hasNext();
+    }
+
+    @Override
+    public T next() {
+        if (hasNext()) {
+            return current.next();
+        }
+        throw new NoSuchElementException();
+    }
+
+    @Override
+    public void remove() {
+        if (hasNext()) {
+            current.remove();
+        }
+        throw new NoSuchElementException();
+    }
+}