diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/PortPair.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/PortPair.java
new file mode 100644
index 0000000..f6285e6
--- /dev/null
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/PortPair.java
@@ -0,0 +1,139 @@
+/*
+ * 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.vtnrsc;
+
+
+/**
+ * Abstraction of an entity providing Port Pair information.
+ * A port pair represents a service function instance.
+ */
+public interface PortPair {
+
+    /**
+     * Returns the ID of this port Pair.
+     *
+     * @return the port pair id
+     */
+    PortPairId portPairId();
+
+    /**
+     * Returns the tenant id of this port pair.
+     *
+     * @return an tenant id
+     */
+    TenantId tenantId();
+
+    /**
+     * Returns the description of this port pair.
+     *
+     * @return description of port pair
+     */
+    String name();
+
+    /**
+     * Returns the description of this port pair.
+     *
+     * @return description of port pair
+     */
+    String description();
+
+    /**
+     * Returns the ingress port of this port pair.
+     *
+     * @return ingress of port pair
+     */
+    String ingress();
+
+    /**
+     * Returns the egress port of this port pair.
+     *
+     * @return egress of port pair
+     */
+    String egress();
+
+    /**
+     * Returns whether this port pair is an exact match to the port pair given
+     * in the argument.
+     * <p>
+     * Exact match means the Port port pairs match with the given port pair.
+     * It does not consider the port pair id, name and description.
+     * </p>
+     * @param portPair other port pair to match against
+     * @return true if the port pairs are an exact match, otherwise false
+     */
+    boolean exactMatch(PortPair portPair);
+
+    /**
+     * A port pair builder..
+     */
+    interface Builder {
+
+        /**
+         * Assigns the port pair id to this object.
+         *
+         * @param portPairId the port pair id
+         * @return this the builder object
+         */
+        Builder setId(PortPairId portPairId);
+
+        /**
+         * Assigns tenant id to this object.
+         *
+         * @param tenantId tenant id of the port pair
+         * @return this the builder object
+         */
+        Builder setTenantId(TenantId tenantId);
+
+        /**
+         * Assigns the name to this object.
+         *
+         * @param name name of the port pair
+         * @return this the builder object
+         */
+        Builder setName(String name);
+
+        /**
+         * Assigns the description to this object.
+         *
+         * @param description description of the port pair
+         * @return this the builder object
+         */
+        Builder setDescription(String description);
+
+        /**
+         * Assigns the ingress port to this object.
+         *
+         * @param port ingress port of the port pair
+         * @return this the builder object
+         */
+        Builder setIngress(String port);
+
+        /**
+         * Assigns the egress port to this object.
+         *
+         * @param port egress port of the port pair
+         * @return this the builder object
+         */
+        Builder setEgress(String port);
+
+        /**
+         * Builds a port pair object.
+         *
+         * @return a port pair.
+         */
+        PortPair build();
+    }
+}