diff --git a/apps/pim/src/main/java/org/onosproject/pim/impl/PIMInterfaceService.java b/apps/pim/src/main/java/org/onosproject/pim/impl/PIMInterfaceService.java
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index 0000000..528c51d
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+++ b/apps/pim/src/main/java/org/onosproject/pim/impl/PIMInterfaceService.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.onosproject.pim.impl;
+
+import org.onosproject.incubator.net.intf.Interface;
+import org.onosproject.net.ConnectPoint;
+
+/**
+ * Define the PIMInterfaceService.  PIM will use ONOS Interfaces to
+ * define PIM Interfaces.  The PIM Application signed up as a Netconfig
+ * listener.
+ *
+ * TODO: Do we need a PIMInterfaceListenerService?  Who sould listen to Interfaces changes?
+ */
+public interface PIMInterfaceService {
+
+    /**
+     * Update the corresponding PIMInterface.  If the PIMInterface
+     * does not exist it will be created.
+     *
+     * @param intf ONOS Interface.
+     */
+    public void updateInterface(Interface intf);
+
+    /**
+     * Delete the PIMInterface that corresponds to the given ConnectPoint.
+     *
+     * @param cp The connect point associated with this interface.
+     */
+    public void deleteInterface(ConnectPoint cp);
+
+    /**
+     * Return the PIMInterface associated with the given ConnectPoint.
+     *
+     * @param cp The ConnectPoint we want to get the PIMInterface for.
+     * @return the PIMInterface if it exists, NULL if it does not exist.
+     */
+    public PIMInterface getPIMInterface(ConnectPoint cp);
+}