diff --git a/apps/pcep-api/src/main/java/org/onosproject/pcep/api/PcepTunnel.java b/apps/pcep-api/src/main/java/org/onosproject/pcep/api/PcepTunnel.java
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+++ b/apps/pcep-api/src/main/java/org/onosproject/pcep/api/PcepTunnel.java
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+/*
+ * 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.pcep.api;
+
+import java.util.List;
+
+/**
+ * Abstraction of a generalized  PCEP Tunnel entity (bandwidth pipe) for
+ * L2 networks or L1/L0 networks, representation of e.g., VLAN, L1 ODUk
+ * connection, WDM OCH, etc..
+ */
+public interface PcepTunnel extends PcepOperator {
+
+    /**
+     * Describe the type of a tunnel.
+     */
+    public static enum Type {
+
+        /**
+         * Signifies that this is a L0 OCH tunnel.
+         */
+        OCH,
+
+        /**
+         * Signifies that this is a L1 OTN tunnel.
+         */
+        OTN,
+
+        /**
+         * Signifies that this is a L2 tunnel.
+         */
+        UNI,
+    }
+
+    /**
+     * The ability of a tunnel.
+     */
+    public static enum Ability {
+        /**
+         * no protected tunnel,if the tunnel is broken ,then the user is out of
+         * service.
+         */
+        NOPROTECTED,
+
+        /**
+         * tunnel with rerouter ability.if a tunnel is broken, the tunnel will
+         * try to find another path to provider service.
+         */
+        SILVER,
+
+        /**
+         * tunnel with 1 + 1 rerouter ability.if a tunnel is broken, there'll be
+         * another tunnel providing service at once.
+         */
+        DIAMOND
+    }
+
+    public static enum PATHTYPE {
+
+        /**
+         * the preferred path.
+         */
+        FIRST,
+
+        /**
+         * the alternate path.
+         */
+        SECOND
+    }
+
+    /**
+     * Get the type of a tunnel.
+     *
+     * @return tunnel type
+     */
+    public Type type();
+
+    /**
+     * Get the name of a tunnel.
+     *
+     * @return tunnel name
+     */
+    public String name();
+
+    /**
+     * Get the device id of destination endpoint of a tunnel.
+     *
+     * @return device id
+     */
+    public PcepDpid srcDeviceID();
+
+    /**
+     * Get the device id of source endpoint of a tunnel.
+     *
+     * @return device id
+     */
+    public PcepDpid dstDeviceId();
+
+    /**
+     * Get source port of a tunnel.
+     *
+     * @return port number
+     */
+    public long srcPort();
+
+    /**
+     * Get destination port of a tunnel.
+     *
+     * @return port number
+     */
+    public long dstPort();
+
+    /**
+     * Get the bandwidth of a tunnel.
+     *
+     * @return bandwidth
+     */
+    public long bandWidth();
+
+    /**
+     * Get the tunnel id.
+     *
+     * @return id of the PCEP tunnel
+     */
+    public long id();
+
+    /**
+     * Get the detail hop list of a tunnel.
+     *
+     * @return hop list
+     */
+    public List<PcepHopNodeDescription> getHopList();
+
+    /**
+     * Get the instance of a pcep tunnel,a instance is used to mark the times of a tunnel created.
+     * instance and id identify a tunnel together.
+     *
+     * @return the instance of a tunnel.
+     */
+    public int getInstance();
+
+    /**
+     * Get the ability of a tunnel.NOPROTECTED,SILVER,or DIAMOND.
+     *
+     * @return ability of the tunenl
+     */
+    public Ability getSla();
+
+    /**
+     * Get the path type of a path if the tunnel's ability is diamond .
+     *
+     * @return the type of a path, the preferred or alternate.
+     */
+    public PATHTYPE getPathType();
+
+    /**
+     * Get the under lay tunnel id of VLAN tunnel.
+     *
+     * @return the tunnel id of a OCH tunnel under lay of a VLAN tunnel.
+     */
+    public long underLayTunnelId();
+
+}