diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/subtypes/OspfExternalDestination.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/subtypes/OspfExternalDestination.java
new file mode 100644
index 0000000..fd4882f
--- /dev/null
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/subtypes/OspfExternalDestination.java
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2014-2016 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.lsa.subtypes;
+
+import com.google.common.base.MoreObjects;
+import org.onlab.packet.Ip4Address;
+
+/**
+ * Defines the OSPF external destination.
+ */
+public class OspfExternalDestination {
+
+    private boolean isType1orType2Metric;
+    private int metric;
+    private Ip4Address forwardingAddress;
+    private int externalRouterTag;
+
+    /**
+     * Gets whether type1 or type 2 metric.
+     *
+     * @return true if Type1 or false if Type2 metric
+     */
+    public boolean isType1orType2Metric() {
+        return isType1orType2Metric;
+    }
+
+    /**
+     * Sets whether type1 or Type2 metric.
+     *
+     * @param isType1orType2Metric is type 1 or type 2 metric
+     */
+    public void setType1orType2Metric(boolean isType1orType2Metric) {
+        this.isType1orType2Metric = isType1orType2Metric;
+    }
+
+    /**
+     * Gets the metric value.
+     *
+     * @return metric value
+     */
+    public int metric() {
+        return metric;
+    }
+
+    /**
+     * Sets the metric value.
+     *
+     * @param metric metric value
+     */
+    public void setMetric(int metric) {
+        this.metric = metric;
+    }
+
+    /**
+     * Gets forwarding address.
+     *
+     * @return forwarding address
+     */
+    public Ip4Address forwardingAddress() {
+        return forwardingAddress;
+    }
+
+    /**
+     * Sets forwarding address.
+     *
+     * @param forwardingAddress forwarding address
+     */
+    public void setForwardingAddress(Ip4Address forwardingAddress) {
+        this.forwardingAddress = forwardingAddress;
+    }
+
+    /**
+     * Gets external router tag.
+     *
+     * @return external router tag
+     */
+    public int externalRouterTag() {
+        return externalRouterTag;
+    }
+
+    /**
+     * Sets external router tag.
+     *
+     * @param externalRouterTag external router tag
+     */
+    public void setExternalRouterTag(int externalRouterTag) {
+        this.externalRouterTag = externalRouterTag;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("isType1orType2Metric", isType1orType2Metric)
+                .add("metric", metric)
+                .add("forwardingAddress", forwardingAddress)
+                .add("externalRouterTag", externalRouterTag)
+                .toString();
+    }
+}
\ No newline at end of file
diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/subtypes/OspfLsaLink.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/subtypes/OspfLsaLink.java
new file mode 100644
index 0000000..5db5648
--- /dev/null
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/subtypes/OspfLsaLink.java
@@ -0,0 +1,132 @@
+/*
+ * 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.lsa.subtypes;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Representation of an OSPF LSA link.
+ */
+public class OspfLsaLink {
+
+    public String linkId;
+    public String linkData;
+    public int linkType;
+    public int metric;
+    public int tos;
+
+    /**
+     * Gets link id.
+     *
+     * @return link id
+     */
+    public String linkId() {
+        return linkId;
+    }
+
+    /**
+     * Sets link id.
+     *
+     * @param linkId link id
+     */
+    public void setLinkId(String linkId) {
+        this.linkId = linkId;
+    }
+
+    /**
+     * Gets link data.
+     *
+     * @return link data
+     */
+    public String linkData() {
+        return linkData;
+    }
+
+    /**
+     * Sets link data.
+     *
+     * @param linkData link data
+     */
+    public void setLinkData(String linkData) {
+        this.linkData = linkData;
+    }
+
+    /**
+     * Gets link type.
+     *
+     * @return link type
+     */
+    public int linkType() {
+        return linkType;
+    }
+
+    /**
+     * Sets link type.
+     *
+     * @param linkType link type
+     */
+    public void setLinkType(int linkType) {
+        this.linkType = linkType;
+    }
+
+    /**
+     * Gets metric value.
+     *
+     * @return metric.
+     */
+    public int metric() {
+        return metric;
+    }
+
+    /**
+     * Sets metric value.
+     *
+     * @param metric metric
+     */
+    public void setMetric(int metric) {
+        this.metric = metric;
+    }
+
+    /**
+     * Gets tos.
+     *
+     * @return tos
+     */
+    public int tos() {
+        return tos;
+    }
+
+    /**
+     * Sets tos.
+     *
+     * @param tos tos
+     */
+    public void setTos(int tos) {
+        this.tos = tos;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("linkID", linkId)
+                .add("linkData", linkData)
+                .add("linkType", linkType)
+                .add("metric", metric)
+                .add("tos", tos)
+                .toString();
+    }
+}
\ No newline at end of file
diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/AsbrSummaryLsa.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/AsbrSummaryLsa.java
new file mode 100644
index 0000000..d5c9047
--- /dev/null
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/AsbrSummaryLsa.java
@@ -0,0 +1,196 @@
+/*
+ * 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.lsa.types;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import com.google.common.primitives.Bytes;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.ospf.controller.OspfLsaType;
+import org.onosproject.ospf.exceptions.OspfErrorType;
+import org.onosproject.ospf.exceptions.OspfParseException;
+import org.onosproject.ospf.protocol.lsa.LsaHeader;
+import org.onosproject.ospf.protocol.util.OspfUtil;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Representation of an ASBR Summary LSA and methods to access them.
+ */
+public class AsbrSummaryLsa extends LsaHeader {
+
+    /*
+        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
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |            LS age             |     Options   |    3 or 4     |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                        Link State ID                          |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                     Advertising Router                        |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                     LS sequence number                        |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |         LS checksum           |             length            |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                         Network Mask                          |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |      0        |                  metric                       |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |     TOS       |                TOS  metric                    |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                              ...                              |
+
+        Summary LSA format
+        REFERENCE : RFC 2328
+     */
+    private Ip4Address networkMask;
+    private int metric;
+
+    /**
+     * Creates an instance of ASBR Summary LSA.
+     *
+     * @param lsaHeader lsa header instance.
+     */
+    public AsbrSummaryLsa(LsaHeader lsaHeader) {
+        populateHeader(lsaHeader);
+    }
+
+    /**
+     * Gets network mask.
+     *
+     * @return networkMask network mask
+     */
+    public Ip4Address networkMask() {
+        return networkMask;
+    }
+
+    /**
+     * Sets network mask.
+     *
+     * @param networkMask network mask
+     */
+    public void setNetworkMask(Ip4Address networkMask) {
+        this.networkMask = networkMask;
+    }
+
+    /**
+     * Gets metric value.
+     *
+     * @return metric value
+     */
+    public int metric() {
+        return metric;
+    }
+
+    /**
+     * Sets metric value.
+     *
+     * @param metric metric value
+     */
+    public void setMetric(int metric) {
+        this.metric = metric;
+    }
+
+    /**
+     * Reads from channel buffer and populate instance.
+     *
+     * @param channelBuffer channelBuffer instance.
+     * @throws OspfParseException might throws exception while parsing buffer
+     */
+    public void readFrom(ChannelBuffer channelBuffer) throws OspfParseException {
+        try {
+            byte[] tempByteArray = new byte[OspfUtil.FOUR_BYTES];
+            channelBuffer.readBytes(tempByteArray, 0, OspfUtil.FOUR_BYTES);
+            this.setNetworkMask(Ip4Address.valueOf(tempByteArray));
+            int unusedByte = channelBuffer.readByte();
+            this.setMetric(channelBuffer.readUnsignedMedium());
+        } catch (Exception e) {
+            log.debug("Error::AsbrSummaryLsa:: {}", e.getMessage());
+            throw new OspfParseException(OspfErrorType.OSPF_MESSAGE_ERROR, OspfErrorType.BAD_MESSAGE);
+        }
+    }
+
+    /**
+     * Gets LSA bytes as array.
+     *
+     * @return LSA message as bytes
+     * @throws OspfParseException might throws exception while parsing packet
+     */
+    public byte[] asBytes() throws OspfParseException {
+        byte[] lsaMessage = null;
+
+        byte[] lsaHeader = getLsaHeaderAsByteArray();
+        byte[] lsaBody = getLsaBodyAsByteArray();
+        lsaMessage = Bytes.concat(lsaHeader, lsaBody);
+
+        return lsaMessage;
+    }
+
+    /**
+     * Get LSA body as byte array.
+     *
+     * @return byte array contains lsa body
+     * @throws OspfParseException might throws exception while parsing packet
+     */
+    public byte[] getLsaBodyAsByteArray() throws OspfParseException {
+        List<Byte> bodyLst = new ArrayList<>();
+
+        try {
+            bodyLst.addAll(Bytes.asList(this.networkMask().toOctets()));
+            bodyLst.addAll(Bytes.asList(OspfUtil.convertToFourBytes(this.metric())));
+        } catch (Exception e) {
+            log.debug("Error::getLsrBodyAsByteArray {}", e.getMessage());
+            throw new OspfParseException(OspfErrorType.OSPF_MESSAGE_ERROR, OspfErrorType.BAD_MESSAGE);
+        }
+
+        return Bytes.toArray(bodyLst);
+    }
+
+    @Override
+    public OspfLsaType getOspfLsaType() {
+        return OspfLsaType.ASBR_SUMMARY;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        AsbrSummaryLsa that = (AsbrSummaryLsa) o;
+        return Objects.equal(networkMask, that.networkMask) &&
+                Objects.equal(metric, that.metric);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(networkMask, metric);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("networkMask", networkMask)
+                .add("metric", metric)
+                .toString();
+    }
+}
\ No newline at end of file
diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/ExternalLsa.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/ExternalLsa.java
new file mode 100644
index 0000000..c6d1642
--- /dev/null
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/ExternalLsa.java
@@ -0,0 +1,234 @@
+/*
+ * 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.lsa.types;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import com.google.common.primitives.Bytes;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.ospf.controller.OspfLsaType;
+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.subtypes.OspfExternalDestination;
+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 External LSA and the fields and methods to access them.
+ */
+public class ExternalLsa extends LsaHeader {
+
+    /*
+        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
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |            LS age             |     Options   |      5        |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |                        Link State ID                          |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |                     Advertising Router                        |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |                     LS sequence number                        |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |         LS checksum           |             length            |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |                         Network Mask                          |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |E|     0       |                  metric                       |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |                      Forwarding address                       |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |                      External Route Tag                       |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |E|    TOS      |                TOS  metric                    |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |                      Forwarding address                       |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |                      External Route Tag                       |
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |                              ...                              |
+
+        External LSA format
+        REFERENCE : RFC 2328
+     */
+    private static final Logger log =
+            LoggerFactory.getLogger(ExternalLsa.class);
+    private Ip4Address networkMask;
+    private List<OspfExternalDestination> externalDestinations = new ArrayList<>();
+
+    /**
+     * Creates an instance of External LSA.
+     *
+     * @param lsaHeader lsa header instance.
+     */
+    public ExternalLsa(LsaHeader lsaHeader) {
+        populateHeader(lsaHeader);
+    }
+
+
+    /**
+     * Gets the network mask.
+     *
+     * @return networkMask
+     */
+    public Ip4Address networkMask() {
+        return networkMask;
+    }
+
+    /**
+     * Sets network mask.
+     *
+     * @param networkMask network mask
+     */
+    public void setNetworkMask(Ip4Address networkMask) {
+        this.networkMask = networkMask;
+    }
+
+    /**
+     * Adds the external destination details to the list.
+     *
+     * @param externalDestination external destination details
+     */
+    public void addExternalDestination(OspfExternalDestination externalDestination) {
+        if (!externalDestinations.contains(externalDestination)) {
+            externalDestinations.add(externalDestination);
+        }
+    }
+
+    /**
+     * Reads from channel buffer and populate instance.
+     *
+     * @param channelBuffer channelBuffer instance
+     * @throws OspfParseException might throws exception while parsing buffer
+     */
+    public void readFrom(ChannelBuffer channelBuffer) throws OspfParseException {
+
+        try {
+            byte[] tempByteArray = new byte[OspfUtil.FOUR_BYTES];
+            channelBuffer.readBytes(tempByteArray, 0, OspfUtil.FOUR_BYTES);
+            this.setNetworkMask(Ip4Address.valueOf(tempByteArray));
+
+            while (channelBuffer.readableBytes() >= OspfUtil.EXTERNAL_DESTINATION_LENGTH) {
+                OspfExternalDestination externalDestination = new OspfExternalDestination();
+
+                //E Bit - use to find type1 or type2
+                int eIsSet = channelBuffer.readByte();
+                if (eIsSet != 0) {
+                    externalDestination.setType1orType2Metric(true);
+                } else {
+                    externalDestination.setType1orType2Metric(false);
+                }
+                externalDestination.setMetric(channelBuffer.readUnsignedMedium());
+                tempByteArray = new byte[OspfUtil.FOUR_BYTES];
+                channelBuffer.readBytes(tempByteArray, 0, OspfUtil.FOUR_BYTES);
+                externalDestination.setForwardingAddress(Ip4Address.valueOf(tempByteArray));
+                externalDestination.setExternalRouterTag(channelBuffer.readInt());
+
+                this.addExternalDestination(externalDestination);
+            }
+        } catch (Exception e) {
+            log.debug("Error::ExternalLSA:: {}", e.getMessage());
+            throw new OspfParseException(OspfErrorType.OSPF_MESSAGE_ERROR, OspfErrorType.BAD_MESSAGE);
+        }
+    }
+
+    /**
+     * Gets LSA as bytes.
+     *
+     * @return LSA as bytes.
+     * @throws OspfParseException might throws exception while parsing packet
+     */
+    public byte[] asBytes() throws OspfParseException {
+        byte[] lsaMessage = null;
+
+        byte[] lsaHeader = getLsaHeaderAsByteArray();
+        byte[] lsaBody = getLsaBodyAsByteArray();
+        lsaMessage = Bytes.concat(lsaHeader, lsaBody);
+
+        return lsaMessage;
+    }
+
+    /**
+     * Gets LSA body as byte array.
+     *
+     * @return byte array contains LSA body
+     * @throws OspfParseException might throws exception while parsing buffer
+     */
+    public byte[] getLsaBodyAsByteArray() throws OspfParseException {
+        List<Byte> bodyLst = new ArrayList<>();
+
+        try {
+            bodyLst.addAll(Bytes.asList(this.networkMask().toOctets()));
+
+            //add each OSPFExternalDestination details
+            for (OspfExternalDestination externalDest : externalDestinations) {
+                if (externalDest.isType1orType2Metric()) {
+                    //add 1 followed by 7 zeros equals to decimal 128
+                    bodyLst.add((byte) 128);
+                } else {
+                    bodyLst.add((byte) 0);
+                }
+
+                bodyLst.addAll(Bytes.asList(OspfUtil.convertToThreeBytes(externalDest.metric())));
+                bodyLst.addAll(Bytes.asList(externalDest.forwardingAddress().toOctets()));
+                bodyLst.addAll(Bytes.asList(OspfUtil.convertToFourBytes(externalDest.externalRouterTag())));
+            }
+        } catch (Exception e) {
+            log.debug("Error::getLsrBodyAsByteArray {}", e.getMessage());
+            return Bytes.toArray(bodyLst);
+        }
+
+        return Bytes.toArray(bodyLst);
+    }
+
+    @Override
+    public OspfLsaType getOspfLsaType() {
+        return OspfLsaType.EXTERNAL_LSA;
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (this == other) {
+            return true;
+        }
+        if (other == null || getClass() != other.getClass()) {
+            return false;
+        }
+        ExternalLsa that = (ExternalLsa) other;
+        return Objects.equal(networkMask, that.networkMask) &&
+                Objects.equal(externalDestinations, that.externalDestinations);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(networkMask, externalDestinations);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("networkMask", networkMask)
+                .add("externalDestinations", externalDestinations)
+                .toString();
+    }
+}
\ No newline at end of file
diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/NetworkLsa.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/NetworkLsa.java
new file mode 100644
index 0000000..07465b2
--- /dev/null
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/NetworkLsa.java
@@ -0,0 +1,195 @@
+/*
+ * 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.lsa.types;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import com.google.common.primitives.Bytes;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.ospf.exceptions.OspfErrorType;
+import org.onosproject.ospf.exceptions.OspfParseException;
+import org.onosproject.ospf.protocol.lsa.LsaHeader;
+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 a Network LSA and fields and methods to access them.
+ */
+public class NetworkLsa extends LsaHeader {
+
+    /*
+        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
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |            LS age             |      Options  |      2        |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                        Link State ID                          |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                     Advertising Router                        |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                     LS sequence number                        |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |         LS checksum           |             length            |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                         Network Mask                          |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                        Attached Router                        |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                              ...                              |
+     */
+    private static final Logger log =
+            LoggerFactory.getLogger(NetworkLsa.class);
+    private Ip4Address networkMask;
+    private List<Ip4Address> attachedRouters = new ArrayList<>();
+
+    /**
+     * Creates an instance of Network LSA.
+     */
+    public NetworkLsa() {
+    }
+
+    /**
+     * Creates an instance of Network LSA.
+     *
+     * @param lsaHeader lsa header instance.
+     */
+    public NetworkLsa(LsaHeader lsaHeader) {
+        populateHeader(lsaHeader);
+    }
+
+    /**
+     * Gets network mask.
+     *
+     * @return network mask
+     */
+    public Ip4Address networkMask() {
+        return networkMask;
+    }
+
+    /**
+     * Sets network mask.
+     *
+     * @param networkMask network mask
+     */
+    public void setNetworkMask(Ip4Address networkMask) {
+        this.networkMask = networkMask;
+    }
+
+    /**
+     * Adds attached router to list.
+     *
+     * @param attachedRouter attached router ip address.
+     */
+    public void addAttachedRouter(Ip4Address attachedRouter) {
+        attachedRouters.add(attachedRouter);
+    }
+
+    /**
+     * Reads from channel buffer and populate instance.
+     *
+     * @param channelBuffer channel buffer instance
+     * @throws OspfParseException might throws exception while parsing buffer
+     */
+    public void readFrom(ChannelBuffer channelBuffer) throws OspfParseException {
+
+        try {
+            byte[] tempByteArray = new byte[OspfUtil.FOUR_BYTES];
+            channelBuffer.readBytes(tempByteArray, 0, OspfUtil.FOUR_BYTES);
+            this.setNetworkMask(Ip4Address.valueOf(tempByteArray));
+            //add all the attached routers
+            while (channelBuffer.readableBytes() > 0) {
+                tempByteArray = new byte[OspfUtil.FOUR_BYTES];
+                channelBuffer.readBytes(tempByteArray, 0, OspfUtil.FOUR_BYTES);
+                this.addAttachedRouter(Ip4Address.valueOf(tempByteArray));
+            }
+        } catch (Exception e) {
+            log.debug("Error::NetworkLSA::readFrom:: {}", e.getMessage());
+            throw new OspfParseException(OspfErrorType.OSPF_MESSAGE_ERROR, OspfErrorType.BAD_MESSAGE);
+        }
+    }
+
+    /**
+     * Gets LSA as bytes.
+     *
+     * @return LSA as byte array
+     * @throws OspfParseException might throws exception while parsing packet
+     */
+    public byte[] asBytes() throws OspfParseException {
+        byte[] lsaMessage = null;
+
+        byte[] lsaHeader = getLsaHeaderAsByteArray();
+        byte[] lsaBody = getLSABodyAsByteArray();
+        lsaMessage = Bytes.concat(lsaHeader, lsaBody);
+
+        return lsaMessage;
+    }
+
+    /**
+     * Gets LSA body as byte array.
+     *
+     * @return LSA body as byte array
+     * @throws OspfParseException might throws exception while parsing packet
+     */
+    public byte[] getLSABodyAsByteArray() throws OspfParseException {
+        List<Byte> bodyLst = new ArrayList<>();
+
+        try {
+            bodyLst.addAll(Bytes.asList(this.networkMask().toOctets()));
+            //add each attachedRouters details
+            for (Ip4Address attachedRouter : attachedRouters) {
+                //attached router
+                bodyLst.addAll(Bytes.asList(attachedRouter.toOctets()));
+            }
+        } catch (Exception e) {
+            log.debug("Error::NetworkLSA::getLsrBodyAsByteArray {}", e.getMessage());
+            throw new OspfParseException(OspfErrorType.OSPF_MESSAGE_ERROR, OspfErrorType.BAD_MESSAGE);
+        }
+
+        return Bytes.toArray(bodyLst);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        NetworkLsa that = (NetworkLsa) o;
+        return Objects.equal(networkMask, that.networkMask) &&
+                Objects.equal(attachedRouters, that.attachedRouters);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(networkMask, attachedRouters);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("networkMask", networkMask)
+                .add("attachedRouters", attachedRouters)
+                .toString();
+    }
+}
\ No newline at end of file
diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/OpaqueLsa11.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/OpaqueLsa11.java
new file mode 100644
index 0000000..d86d8b2
--- /dev/null
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/OpaqueLsa11.java
@@ -0,0 +1,124 @@
+/*
+ * 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.lsa.types;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import com.google.common.primitives.Bytes;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.ospf.controller.OspfLsaType;
+import org.onosproject.ospf.protocol.lsa.OpaqueLsaHeader;
+
+/**
+ * Representation of an Opaque LSA of type AS (11).
+ */
+public class OpaqueLsa11 extends OpaqueLsaHeader {
+    /*
+      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
+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     |            LS age             |     Options   |   9, 10 or 11 |
+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     |  Opaque Type  |               Opaque ID                       |
+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     |                      Advertising Router                       |
+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     |                      LS Sequence Number                       |
+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     |         LS checksum           |           Length              |
+     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     |                                                               |
+     +                                                               +
+     |                      Opaque Information                       |
+     +                                                               +
+     |                              ...                              |
+    */
+    private byte[] opaqueInfo = null;
+
+    /**
+     * Creates an instance of Opaque type 11 LSA.
+     *
+     * @param lsaHeader LSA header instance
+     */
+    public OpaqueLsa11(OpaqueLsaHeader lsaHeader) {
+        populateHeader(lsaHeader);
+    }
+
+    /**
+     * Reads from channel buffer and populate this.
+     *
+     * @param channelBuffer channelBuffer instance.
+     */
+    public void readFrom(ChannelBuffer channelBuffer) {
+        int length = channelBuffer.readableBytes();
+        opaqueInfo = new byte[length];
+        channelBuffer.readBytes(opaqueInfo, 0, length);
+    }
+
+    /**
+     * Returns instance as bytes.
+     *
+     * @return instance as bytes
+     */
+    public byte[] asBytes() {
+        byte[] lsaMessage = null;
+
+        byte[] lsaHeader = getOpaqueLsaHeaderAsByteArray();
+        byte[] lsaBody = getLsaBodyAsByteArray();
+        lsaMessage = Bytes.concat(lsaHeader, lsaBody);
+
+        return lsaMessage;
+    }
+
+    /**
+     * Get the LSA body as byte array.
+     *
+     * @return LSA body as byte array
+     */
+    public byte[] getLsaBodyAsByteArray() {
+        return opaqueInfo;
+    }
+
+    @Override
+    public OspfLsaType getOspfLsaType() {
+        return OspfLsaType.AS_OPAQUE_LSA;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        OpaqueLsa11 that = (OpaqueLsa11) o;
+        return Objects.equal(opaqueInfo, that.opaqueInfo);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(opaqueInfo);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("opaqueInfo", opaqueInfo)
+                .toString();
+    }
+}
\ No newline at end of file
diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/OpaqueLsa9.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/OpaqueLsa9.java
new file mode 100644
index 0000000..0780be0
--- /dev/null
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/OpaqueLsa9.java
@@ -0,0 +1,126 @@
+/*
+ * 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.lsa.types;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import com.google.common.primitives.Bytes;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.ospf.controller.OspfLsaType;
+import org.onosproject.ospf.protocol.lsa.OpaqueLsaHeader;
+
+/**
+ * Representation of an Opaque LSA of type link local (9).
+ */
+public class OpaqueLsa9 extends OpaqueLsaHeader {
+
+    /*
+       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
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |            LS age             |     Options   |   9, 10 or 11 |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |  Opaque Type  |               Opaque ID                       |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |                      Advertising Router                       |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |                      LS Sequence Number                       |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |         LS checksum           |           Length              |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |                                                               |
+      +                                                               +
+      |                      Opaque Information                       |
+      +                                                               +
+      |                              ...                              |
+     */
+    private byte[] opaqueInfo = null;
+
+    /**
+     * Creates an instance of Opaque type 9 LSA.
+     *
+     * @param lsaHeader LSA header instance
+     */
+    public OpaqueLsa9(OpaqueLsaHeader lsaHeader) {
+        populateHeader(lsaHeader);
+    }
+
+    /**
+     * Reads from channel buffer and populate instance.
+     *
+     * @param channelBuffer channelBuffer instance
+     */
+    public void readFrom(ChannelBuffer channelBuffer) {
+        int length = channelBuffer.readableBytes();
+        opaqueInfo = new byte[length];
+        channelBuffer.readBytes(opaqueInfo, 0, length);
+    }
+
+    /**
+     * Returns instance as bytes.
+     *
+     * @return instance as bytes
+     */
+    public byte[] asBytes() {
+        byte[] lsaMessage = null;
+
+        byte[] lsaHeader = getOpaqueLsaHeaderAsByteArray();
+        byte[] lsaBody = getLsaBodyAsByteArray();
+        lsaMessage = Bytes.concat(lsaHeader, lsaBody);
+
+        return lsaMessage;
+    }
+
+    /**
+     * Gets the LSA body.
+     *
+     * @return the LSA body
+     */
+    public byte[] getLsaBodyAsByteArray() {
+        return opaqueInfo;
+
+    }
+
+    @Override
+    public OspfLsaType getOspfLsaType() {
+        return OspfLsaType.LINK_LOCAL_OPAQUE_LSA;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        OpaqueLsa9 that = (OpaqueLsa9) o;
+        return Objects.equal(opaqueInfo, that.opaqueInfo);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(opaqueInfo);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("opaqueInfo", opaqueInfo)
+                .toString();
+    }
+}
\ No newline at end of file
diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/SummaryLsa.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/SummaryLsa.java
new file mode 100644
index 0000000..df16dd9
--- /dev/null
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/SummaryLsa.java
@@ -0,0 +1,195 @@
+/*
+ * 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.lsa.types;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import com.google.common.primitives.Bytes;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.ospf.controller.OspfLsaType;
+import org.onosproject.ospf.exceptions.OspfErrorType;
+import org.onosproject.ospf.exceptions.OspfParseException;
+import org.onosproject.ospf.protocol.lsa.LsaHeader;
+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 a Summary LSA, fields and methods to access them.
+ */
+public class SummaryLsa extends LsaHeader {
+    /*
+        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
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |            LS age             |     Options   |    3 or 4     |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                        Link State ID                          |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                     Advertising Router                        |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                     LS sequence number                        |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |         LS checksum           |             length            |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                         Network Mask                          |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |      0        |                  metric                       |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |     TOS       |                TOS  metric                    |
+       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+       |                              ...                              |
+
+     */
+    private static final Logger log = LoggerFactory.getLogger(SummaryLsa.class);
+    private Ip4Address networkMask;
+    private int metric;
+
+    /**
+     * Creates an instance of Summary LSA.
+     *
+     * @param lsaHeader LSA header instance
+     */
+    public SummaryLsa(LsaHeader lsaHeader) {
+        populateHeader(lsaHeader);
+    }
+
+    /**
+     * Gets network mask.
+     *
+     * @return network mask
+     */
+    public Ip4Address networkMask() {
+        return networkMask;
+    }
+
+    /**
+     * Sets network mask.
+     *
+     * @param networkMask network mask
+     */
+    public void setNetworkMask(Ip4Address networkMask) {
+        this.networkMask = networkMask;
+    }
+
+    /**
+     * Gets metric value.
+     *
+     * @return metric
+     */
+    public int metric() {
+        return metric;
+    }
+
+    /**
+     * Sets metric value.
+     *
+     * @param metric metric value
+     */
+    public void setMetric(int metric) {
+        this.metric = metric;
+    }
+
+    /**
+     * Reads from channel buffer and populate instance.
+     *
+     * @param channelBuffer channelBuffer instance
+     * @throws OspfParseException might throws exception while parsing buffer
+     */
+    public void readFrom(ChannelBuffer channelBuffer) throws OspfParseException {
+
+        try {
+            byte[] tempByteArray = new byte[OspfUtil.FOUR_BYTES];
+            channelBuffer.readBytes(tempByteArray, 0, OspfUtil.FOUR_BYTES);
+            this.setNetworkMask(Ip4Address.valueOf(tempByteArray));
+            int unsedByte = channelBuffer.readByte();
+            this.setMetric(channelBuffer.readUnsignedMedium());
+        } catch (Exception e) {
+            log.debug("Error::SummaryLsa:: {}", e.getMessage());
+            throw new OspfParseException(OspfErrorType.OSPF_MESSAGE_ERROR, OspfErrorType.BAD_MESSAGE);
+        }
+    }
+
+    /**
+     * Returns instance as bytes.
+     *
+     * @return instance as bytes
+     */
+    public byte[] asBytes() {
+        byte[] lsaMessage = null;
+        byte[] lsaHeader = getLsaHeaderAsByteArray();
+        byte[] lsaBody = getLsaBodyAsByteArray();
+        lsaMessage = Bytes.concat(lsaHeader, lsaBody);
+
+        return lsaMessage;
+    }
+
+    /**
+     * Get the LSA body.
+     *
+     * @return LSA body
+     */
+    public byte[] getLsaBodyAsByteArray() {
+        List<Byte> bodyLst = new ArrayList<>();
+
+        try {
+            bodyLst.addAll(Bytes.asList(this.networkMask().toOctets()));
+            bodyLst.add((byte) 0);
+            bodyLst.addAll(Bytes.asList(OspfUtil.convertToThreeBytes(this.metric())));
+        } catch (Exception e) {
+            log.debug("Error::getLsrBodyAsByteArray {}", e.getMessage());
+            return Bytes.toArray(bodyLst);
+        }
+
+        return Bytes.toArray(bodyLst);
+    }
+
+    @Override
+    public OspfLsaType getOspfLsaType() {
+        return OspfLsaType.SUMMARY;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("networkMask", networkMask)
+                .add("metric", metric)
+                .toString();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        SummaryLsa that = (SummaryLsa) o;
+        return Objects.equal(networkMask, that.networkMask) &&
+                Objects.equal(metric, that.metric);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(networkMask, metric);
+    }
+}
\ No newline at end of file
diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/TopLevelTlv.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/TopLevelTlv.java
new file mode 100644
index 0000000..2cf9fdd
--- /dev/null
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/TopLevelTlv.java
@@ -0,0 +1,22 @@
+/*
+ * 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.lsa.types;
+
+/**
+ * Marker interface represents a top level TLV in an Opaque LSA.
+ */
+public interface TopLevelTlv {
+}