OSPF protocol manual merge from 1.6, due to cherry pick merge conflict

Change-Id: I93653e745468722ce95533537a79e897b4292f5d
diff --git a/protocols/ospf/api/src/main/java/org/onosproject/ospf/controller/OspfPacketType.java b/protocols/ospf/api/src/main/java/org/onosproject/ospf/controller/OspfPacketType.java
new file mode 100644
index 0000000..cce21ae
--- /dev/null
+++ b/protocols/ospf/api/src/main/java/org/onosproject/ospf/controller/OspfPacketType.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2016-present 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.ospf.controller;
+
+/**
+ * Representation of different OSPF packet types.
+ */
+public enum OspfPacketType {
+
+    /**
+     * OSPF hello packet.
+     */
+    HELLO(1),
+    /**
+     * OSPF device description packet.
+     */
+    DD(2),
+    /**
+     * OSPF link state request packet.
+     */
+    LSREQUEST(3),
+    /**
+     * OSPF link state update packet.
+     */
+    LSUPDATE(4),
+    /**
+     * OSPF link state acknowledge packet.
+     */
+    LSAACK(5);
+
+    private int value;
+
+    /**
+     * Creates instance of OSPF packet types.
+     *
+     * @param value OSPF packet types
+     */
+    OspfPacketType(int value) {
+        this.value = value;
+    }
+
+    /**
+     * Gets the value.
+     *
+     * @return value
+     */
+    public int value() {
+        return value;
+    }
+}
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