diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/ospfpacket/types/LsAcknowledge.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/ospfpacket/types/LsAcknowledge.java
new file mode 100644
index 0000000..3de74e4
--- /dev/null
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/ospfpacket/types/LsAcknowledge.java
@@ -0,0 +1,202 @@
+/*
+ * Copyright 2016 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.protocol.ospfpacket.types;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.primitives.Bytes;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.ospf.exceptions.OspfErrorType;
+import org.onosproject.ospf.exceptions.OspfParseException;
+import org.onosproject.ospf.protocol.lsa.LsaHeader;
+import org.onosproject.ospf.protocol.lsa.OpaqueLsaHeader;
+import org.onosproject.ospf.protocol.ospfpacket.OspfPacketHeader;
+import org.onosproject.ospf.protocol.util.OspfPacketType;
+import org.onosproject.ospf.protocol.util.OspfParameters;
+import org.onosproject.ospf.protocol.util.OspfUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Representation of an  OSPF Link State Acknowledgment Message.
+ * Link State Acknowledgment Packets are OSPF packet type 5.
+ * To make the flooding of LSAs reliable, flooded LSAs are explicitly
+ * acknowledged. This acknowledgment is accomplished through the
+ * sending and receiving of Link State Acknowledgment packets.
+ * Multiple LSAs can be acknowledged in a single Link State Acknowledgment packet.
+ */
+public class LsAcknowledge extends OspfPacketHeader {
+    /*
+        0                   1                   2                   3
+        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |   Version #   |       5       |         Packet length         |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                          Router ID                            |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                           Area ID                             |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |           Checksum            |             AuType            |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                       Authentication                          |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                       Authentication                          |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                                                               |
+       +-                                                             -+
+       |                                                               |
+       +-                         An LSA Header                       -+
+       |                                                               |
+       +-                                                             -+
+       |                                                               |
+       +-                                                             -+
+       |                                                               |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                              ...                              |
+ */
+    private static final Logger log = LoggerFactory.getLogger(LsAcknowledge.class);
+    private List<LsaHeader> linkStateHeaders = new ArrayList<>();
+
+    /**
+     * Creates an instance of Link State Acknowledgment instance.
+     */
+    public LsAcknowledge() {
+    }
+
+    /**
+     * Creates an instance of Link State Acknowledgment instance.
+     *
+     * @param ospfHeader OSPF header instance.
+     */
+    public LsAcknowledge(OspfPacketHeader ospfHeader) {
+        populateHeader(ospfHeader);
+    }
+
+    /**
+     * Gets ls headers.
+     *
+     * @return ls headers
+     */
+    public List<LsaHeader> getLinkStateHeaders() {
+        return linkStateHeaders;
+    }
+
+    /**
+     * Adds link state header to list.
+     *
+     * @param lsaHeader LSA header
+     */
+    public void addLinkStateHeader(LsaHeader lsaHeader) {
+        if (!linkStateHeaders.contains(lsaHeader)) {
+            linkStateHeaders.add(lsaHeader);
+        }
+    }
+
+    @Override
+    public OspfPacketType ospfMessageType() {
+        return OspfPacketType.LSAACK;
+    }
+
+    @Override
+    public void readFrom(ChannelBuffer channelBuffer) throws OspfParseException {
+        try {
+            //add all the LSA Headers - one header is of 20 bytes
+            while (channelBuffer.readableBytes() >= OspfUtil.LSA_HEADER_LENGTH) {
+                LsaHeader header = OspfUtil.readLsaHeader(channelBuffer);
+                //add the LSAHeader to acknowledge
+                addLinkStateHeader(header);
+            }
+
+        } catch (Exception e) {
+            log.debug("Error::LsAckPacket:: {}", e.getMessage());
+            throw new OspfParseException(OspfErrorType.MESSAGE_HEADER_ERROR, OspfErrorType.BAD_MESSAGE_LENGTH);
+        }
+    }
+
+    @Override
+    public byte[] asBytes() {
+        byte[] lsAckMessage = null;
+
+        byte[] lsAckHeader = getLsAckAsByteArray();
+        byte[] lsAckBody = getLsAckBodyAsByteArray();
+        lsAckMessage = Bytes.concat(lsAckHeader, lsAckBody);
+
+        return lsAckMessage;
+    }
+
+    /**
+     * Gets LSAcknowledge as byte array.
+     *
+     * @return byte array
+     */
+    public byte[] getLsAckAsByteArray() {
+        List<Byte> headerLst = new ArrayList<>();
+        try {
+            headerLst.add((byte) this.ospfVersion());
+            headerLst.add((byte) this.ospfType());
+            headerLst.addAll(Bytes.asList(OspfUtil.convertToTwoBytes(this.ospfPacLength())));
+            headerLst.addAll(Bytes.asList(this.routerId().toOctets()));
+            headerLst.addAll(Bytes.asList(this.areaId().toOctets()));
+            headerLst.addAll(Bytes.asList(OspfUtil.convertToTwoBytes(this.checksum())));
+            headerLst.addAll(Bytes.asList(OspfUtil.convertToTwoBytes(this.authType())));
+            //Authentication is 0 always. Total 8 bytes consist of zero
+            byte[] auth = new byte[OspfUtil.EIGHT_BYTES];
+            headerLst.addAll(Bytes.asList(auth));
+        } catch (Exception e) {
+            log.debug("Error::LsAckPacket:: {}", e.getMessage());
+            return Bytes.toArray(headerLst);
+        }
+
+        return Bytes.toArray(headerLst);
+    }
+
+    /**
+     * Gets LsAck body as byte array.
+     *
+     * @return byte array
+     */
+    public byte[] getLsAckBodyAsByteArray() {
+        List<Byte> bodyLst = new ArrayList<>();
+
+        try {
+            for (LsaHeader lsaHeader : linkStateHeaders) {
+                if (lsaHeader.lsType() == OspfParameters.LINK_LOCAL_OPAQUE_LSA ||
+                        lsaHeader.lsType() == OspfParameters.AREA_LOCAL_OPAQUE_LSA ||
+                        lsaHeader.lsType() == OspfParameters.AS_OPAQUE_LSA) {
+                    OpaqueLsaHeader header = (OpaqueLsaHeader) lsaHeader;
+                    bodyLst.addAll(Bytes.asList(header.getOpaqueLsaHeaderAsByteArray()));
+                } else {
+                    bodyLst.addAll(Bytes.asList(lsaHeader.getLsaHeaderAsByteArray()));
+                }
+            }
+        } catch (Exception e) {
+            log.debug("Error::getLsAckBodyAsByteArray {}", e.getMessage());
+            return Bytes.toArray(bodyLst);
+        }
+
+        return Bytes.toArray(bodyLst);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("linkStateHeaders", linkStateHeaders)
+                .toString();
+    }
+}
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