ISIS protocol manual merge from 1.6 due to cherry pick merge conflict

Change-Id: I6c3abf6a83ddaeba76293dc7864fcec88e9b4e7e
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/Controller.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/Controller.java
index 7cd7785..406d09c 100644
--- a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/Controller.java
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/Controller.java
@@ -30,6 +30,9 @@
 import org.onosproject.isis.controller.IsisNetworkType;
 import org.onosproject.isis.controller.IsisProcess;
 import org.onosproject.isis.controller.IsisRouterType;
+import org.onosproject.isis.controller.topology.IsisAgent;
+import org.onosproject.isis.controller.topology.IsisLink;
+import org.onosproject.isis.controller.topology.IsisRouter;
 import org.onosproject.isis.io.util.IsisConstants;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -43,6 +46,7 @@
 import java.util.List;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.TimeUnit;
 
 import static org.onlab.util.Tools.groupedThreads;
@@ -64,15 +68,29 @@
     private ScheduledExecutorService connectExecutor = null;
     private int connectRetryCounter = 0;
     private int connectRetryTime;
+    private ScheduledFuture future = null;
+    private IsisAgent agent;
 
     /**
      * Deactivates ISIS controller.
      */
     public void isisDeactivate() {
+        disconnectExecutor();
+        processes = null;
         peerExecFactory.shutdown();
     }
 
     /**
+     * Sets ISIS agent.
+     *
+     * @param agent ISIS agent instance
+     */
+    public void setAgent(IsisAgent agent) {
+        this.agent = agent;
+    }
+
+
+    /**
      * Updates the processes configuration.
      *
      * @param jsonNode json node instance
@@ -134,17 +152,17 @@
         peerBootstrap.setOption("keepAlive", true);
         peerBootstrap.setOption("receiveBufferSize", Controller.BUFFER_SIZE);
         peerBootstrap.setOption("receiveBufferSizePredictorFactory",
-                                new FixedReceiveBufferSizePredictorFactory(
-                                        Controller.BUFFER_SIZE));
+                new FixedReceiveBufferSizePredictorFactory(
+                        Controller.BUFFER_SIZE));
         peerBootstrap.setOption("receiveBufferSizePredictor",
-                                new AdaptiveReceiveBufferSizePredictor(64, 1024, 65536));
+                new AdaptiveReceiveBufferSizePredictor(64, 1024, 65536));
         peerBootstrap.setOption("child.keepAlive", true);
         peerBootstrap.setOption("child.tcpNoDelay", true);
         peerBootstrap.setOption("child.sendBufferSize", Controller.BUFFER_SIZE);
         peerBootstrap.setOption("child.receiveBufferSize", Controller.BUFFER_SIZE);
         peerBootstrap.setOption("child.receiveBufferSizePredictorFactory",
-                                new FixedReceiveBufferSizePredictorFactory(
-                                        Controller.BUFFER_SIZE));
+                new FixedReceiveBufferSizePredictorFactory(
+                        Controller.BUFFER_SIZE));
         peerBootstrap.setOption("child.reuseAddress", true);
 
         isisChannelHandler = new IsisChannelHandler(this, processes);
@@ -236,8 +254,8 @@
                     continue;
                 }
                 isisInterface.setIntermediateSystemName(jsonNode1
-                                                                .path(IsisConstants.INTERMEDIATESYSTEMNAME)
-                                                                .asText());
+                        .path(IsisConstants.INTERMEDIATESYSTEMNAME)
+                        .asText());
                 String systemId = jsonNode1.path(IsisConstants.SYSTEMID).asText();
                 if (isValidSystemId(systemId)) {
                     isisInterface.setSystemId(systemId);
@@ -462,7 +480,8 @@
      */
     public void disconnectExecutor() {
         if (connectExecutor != null) {
-            connectExecutor.shutdown();
+            future.cancel(true);
+            connectExecutor.shutdownNow();
             connectExecutor = null;
         }
     }
@@ -480,10 +499,55 @@
      * @param retryDelay retry delay
      */
     private void scheduleConnectionRetry(long retryDelay) {
-        if (this.connectExecutor == null) {
-            this.connectExecutor = Executors.newSingleThreadScheduledExecutor();
+        if (connectExecutor == null) {
+            connectExecutor = Executors.newSingleThreadScheduledExecutor();
         }
-        this.connectExecutor.schedule(new ConnectionRetry(), retryDelay, TimeUnit.MINUTES);
+        future = connectExecutor.schedule(new ConnectionRetry(), retryDelay, TimeUnit.MINUTES);
+    }
+
+    /**
+     * Adds device details.
+     *
+     * @param isisRouter ISIS router instance
+     */
+    public void addDeviceDetails(IsisRouter isisRouter) {
+        agent.addConnectedRouter(isisRouter);
+    }
+
+    /**
+     * Removes device details.
+     *
+     * @param isisRouter Isis router instance
+     */
+    public void removeDeviceDetails(IsisRouter isisRouter) {
+        agent.removeConnectedRouter(isisRouter);
+    }
+
+    /**
+     * Adds link details.
+     *
+     * @param isisLink ISIS link instance
+     */
+    public void addLinkDetails(IsisLink isisLink) {
+        agent.addLink(isisLink);
+    }
+
+    /**
+     * Removes link details.
+     *
+     * @param isisLink ISIS link instance
+     */
+    public void removeLinkDetails(IsisLink isisLink) {
+        agent.deleteLink(isisLink);
+    }
+
+    /**
+     * Returns the isisAgent instance.
+     *
+     * @return agent
+     */
+    public IsisAgent agent() {
+        return this.agent;
     }
 
     /**
@@ -503,7 +567,7 @@
                         if (!future.isSuccess()) {
                             connectRetryCounter++;
                             log.error("Connection failed, ConnectRetryCounter {} remote host {}", connectRetryCounter,
-                                      IsisConstants.SHOST);
+                                    IsisConstants.SHOST);
                             /*
                              * Reconnect to peer on failure is exponential till 4 mins, later on retry after every 4
                              * mins.
@@ -517,7 +581,7 @@
                             isisChannelHandler.sentConfigPacket(configPacket);
                             connectRetryCounter++;
                             log.info("Connected to remote host {}, Connect Counter {}", IsisConstants.SHOST,
-                                     connectRetryCounter);
+                                    connectRetryCounter);
                             disconnectExecutor();
 
                             return;
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisController.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisController.java
index 0929db4..aa0b00f 100644
--- a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisController.java
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisController.java
@@ -16,6 +16,7 @@
 package org.onosproject.isis.controller.impl;
 
 import com.fasterxml.jackson.databind.JsonNode;
+import com.google.common.collect.Sets;
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
@@ -24,12 +25,18 @@
 import org.apache.felix.scr.annotations.Service;
 import org.onosproject.isis.controller.IsisController;
 import org.onosproject.isis.controller.IsisProcess;
+import org.onosproject.isis.controller.topology.IsisAgent;
+import org.onosproject.isis.controller.topology.IsisLink;
+import org.onosproject.isis.controller.topology.IsisLinkListener;
+import org.onosproject.isis.controller.topology.IsisRouter;
 import org.onosproject.isis.controller.topology.IsisRouterListener;
 import org.onosproject.net.driver.DriverService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 
 /**
  * Represents ISIS controller implementation.
@@ -42,10 +49,14 @@
     private final Controller controller = new Controller();
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected DriverService driverService;
+    protected Set<IsisRouterListener> isisRouterListener = new HashSet<>();
+    protected Set<IsisLinkListener> isisLinkListener = Sets.newHashSet();
+    protected IsisAgent agent = new InternalDeviceConfig();
 
     @Activate
     public void activate() {
         log.debug("ISISControllerImpl activate");
+        controller.setAgent(agent);
     }
 
     @Deactivate
@@ -55,6 +66,38 @@
     }
 
     @Override
+    public void addRouterListener(IsisRouterListener listener) {
+        if (!isisRouterListener.contains(listener)) {
+            this.isisRouterListener.add(listener);
+        }
+    }
+
+    @Override
+    public void removeRouterListener(IsisRouterListener listener) {
+        this.isisRouterListener.remove(listener);
+    }
+
+    @Override
+    public void addLinkListener(IsisLinkListener listener) {
+        isisLinkListener.add(listener);
+    }
+
+    @Override
+    public void removeLinkListener(IsisLinkListener listener) {
+        isisLinkListener.remove(listener);
+    }
+
+    @Override
+    public Set<IsisRouterListener> listener() {
+        return isisRouterListener;
+    }
+
+    @Override
+    public Set<IsisLinkListener> linkListener() {
+        return isisLinkListener;
+    }
+
+    @Override
     public List<IsisProcess> allConfiguredProcesses() {
         List<IsisProcess> processes = controller.getAllConfiguredProcesses();
         return processes;
@@ -70,13 +113,37 @@
         }
     }
 
-    @Override
-    public void addRouterListener(IsisRouterListener isisRouterListener) {
-        log.debug("IsisControllerImpl::addRouterListener...");
-    }
+    /**
+     * Notifier for internal ISIS device and link changes.
+     */
+    private class InternalDeviceConfig implements IsisAgent {
+        @Override
+        public boolean addConnectedRouter(IsisRouter isisRouter) {
+            for (IsisRouterListener l : listener()) {
+                l.routerAdded(isisRouter);
+            }
+            return true;
+        }
 
-    @Override
-    public void removeRouterListener(IsisRouterListener isisRouterListener) {
-        log.debug("IsisControllerImpl::removeRouterListener...");
+        @Override
+        public void removeConnectedRouter(IsisRouter isisRouter) {
+            for (IsisRouterListener l : listener()) {
+                l.routerRemoved(isisRouter);
+            }
+        }
+
+        @Override
+        public void addLink(IsisLink isisLink) {
+            for (IsisLinkListener l : linkListener()) {
+                l.addLink(isisLink);
+            }
+        }
+
+        @Override
+        public void deleteLink(IsisLink isisLink) {
+            for (IsisLinkListener l : linkListener()) {
+                l.deleteLink(isisLink);
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisNeighbor.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisNeighbor.java
old mode 100644
new mode 100755
index 3e05a37..0839eb5
--- a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisNeighbor.java
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisNeighbor.java
@@ -356,6 +356,8 @@
         stopInactivityTimeCheck();
         stopHoldingTimeCheck();
         isisInterface.removeNeighbor(this);
+
+        isisInterface.isisLsdb().removeTopology(this, isisInterface);
     }
 
     /**
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/IsisChannelHandler.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/IsisChannelHandler.java
index 73a5626..38e98d1 100644
--- a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/IsisChannelHandler.java
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/IsisChannelHandler.java
@@ -68,6 +68,16 @@
     public IsisChannelHandler(Controller controller, List<IsisProcess> processes) {
         this.controller = controller;
         this.processes = processes;
+        ((DefaultIsisLsdb) isisLsdb).setController(this.controller);
+        ((DefaultIsisLsdb) isisLsdb).setIsisInterface(isisInterfaceList());
+    }
+
+    private List<IsisInterface> isisInterfaceList() {
+        List<IsisInterface> isisInterfaceList = new ArrayList<>();
+        for (Integer key : isisInterfaceMap.keySet()) {
+            isisInterfaceList.add(isisInterfaceMap.get(key));
+        }
+        return isisInterfaceList;
     }
 
     /**
@@ -178,30 +188,25 @@
 
     @Override
     public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
-        log.info("[exceptionCaught]: " + e.toString());
         if (e.getCause() instanceof ReadTimeoutException) {
-            log.error("Disconnecting device {} due to read timeout", e.getChannel().getRemoteAddress());
+            log.debug("Disconnecting device {} due to read timeout", e.getChannel().getRemoteAddress());
             return;
         } else if (e.getCause() instanceof ClosedChannelException) {
             log.debug("Channel for ISIS {} already closed", e.getChannel().getRemoteAddress());
         } else if (e.getCause() instanceof IOException) {
-            log.error("Disconnecting ISIS {} due to IO Error: {}", e.getChannel().getRemoteAddress(),
+            log.debug("Disconnecting ISIS {} due to IO Error: {}", e.getChannel().getRemoteAddress(),
                       e.getCause().getMessage());
-            if (log.isDebugEnabled()) {
-                log.debug("StackTrace for previous Exception: {}", e.getCause());
-            }
         } else if (e.getCause() instanceof IsisParseException) {
             IsisParseException errMsg = (IsisParseException) e.getCause();
             byte errorCode = errMsg.errorCode();
             byte errorSubCode = errMsg.errorSubCode();
-            log.error("Error while parsing message from ISIS {}, ErrorCode {}",
+            log.debug("Error while parsing message from ISIS {}, ErrorCode {}",
                       e.getChannel().getRemoteAddress(), errorCode);
         } else if (e.getCause() instanceof RejectedExecutionException) {
-            log.warn("Could not process message: queue full");
+            log.debug("Could not process message: queue full");
         } else {
-            log.error("Error while processing message from ISIS {}, {}",
+            log.debug("Error while processing message from ISIS {}, {}",
                       e.getChannel().getRemoteAddress(), e.getCause().getMessage());
-            e.getCause().printStackTrace();
         }
     }
 
@@ -274,7 +279,7 @@
      * @param configPacket interface configuration
      */
     public void sentConfigPacket(byte[] configPacket) {
-        if (channel != null) {
+        if (channel != null && channel.isConnected() && channel.isOpen()) {
             channel.write(configPacket);
             log.debug("IsisChannelHandler sentConfigPacket packet sent..!!!");
         } else {
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/LspEventConsumer.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/LspEventConsumer.java
new file mode 100755
index 0000000..8730814
--- /dev/null
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/LspEventConsumer.java
@@ -0,0 +1,354 @@
+/*
+* 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.isis.controller.impl;
+
+import org.onlab.packet.Ip4Address;
+import org.onlab.util.Bandwidth;
+import org.onosproject.isis.controller.IsisNetworkType;
+import org.onosproject.isis.controller.LspWrapper;
+import org.onosproject.isis.controller.impl.topology.DefaultIsisLink;
+import org.onosproject.isis.controller.impl.topology.DefaultIsisLinkInformation;
+import org.onosproject.isis.controller.impl.topology.DefaultIsisLinkTed;
+import org.onosproject.isis.controller.impl.topology.DefaultIsisRouter;
+import org.onosproject.isis.controller.impl.topology.TopologyForDeviceAndLinkImpl;
+import org.onosproject.isis.controller.topology.IsisLink;
+import org.onosproject.isis.controller.topology.IsisLinkTed;
+import org.onosproject.isis.controller.topology.IsisRouter;
+import org.onosproject.isis.controller.topology.LinkInformation;
+import org.onosproject.isis.io.isispacket.pdu.LsPdu;
+import org.onosproject.isis.io.isispacket.tlv.IsExtendedReachability;
+import org.onosproject.isis.io.isispacket.tlv.IsisTlv;
+import org.onosproject.isis.io.isispacket.tlv.NeighborForExtendedIs;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.AdministrativeGroup;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.InterfaceIpAddress;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.MaximumBandwidth;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.MaximumReservableBandwidth;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.NeighborIpAddress;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.TrafficEngineeringMetric;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.TrafficEngineeringSubTlv;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.UnreservedBandwidth;
+import org.onosproject.isis.io.util.IsisConstants;
+import org.onosproject.isis.io.util.IsisUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.BlockingQueue;
+
+/**
+ * Representation of LSP event consumer.
+ */
+public class LspEventConsumer implements Runnable {
+    private static final Logger log = LoggerFactory.getLogger(LspEventConsumer.class);
+    private BlockingQueue queue = null;
+    private Controller controller = null;
+    private TopologyForDeviceAndLinkImpl deviceAndLink = new TopologyForDeviceAndLinkImpl();
+    private Map<String, IsisRouter> isisRouterDetails = new LinkedHashMap<>();
+
+    /**
+     * Creates an instance of this.
+     *
+     * @param queue      blocking queue instance
+     * @param controller controller instance
+     */
+    public LspEventConsumer(BlockingQueue queue, Controller controller) {
+        this.queue = queue;
+        this.controller = controller;
+    }
+
+    @Override
+    public void run() {
+        try {
+            while (true) {
+                if (!queue.isEmpty()) {
+                    LspWrapper wrapper = (LspWrapper) queue.take();
+                    LsPdu lsPdu = (LsPdu) wrapper.lsPdu();
+                    if (wrapper.lspProcessing().equals(IsisConstants.LSPREMOVED)) {
+                        callTopologyToRemoveInfo(lsPdu);
+                    } else if (wrapper.lspProcessing().equals(IsisConstants.LSPADDED)) {
+                        callTopologyToSendInfo(lsPdu, wrapper.isisInterface().networkType(),
+                                               wrapper.isisInterface().systemId() + ".00");
+                    }
+                }
+            }
+        } catch (Exception e) {
+            log.debug("Error::LspsForProvider::{}", e.getMessage());
+        }
+    }
+
+    /**
+     * Sends topology information to core.
+     *
+     * @param lsPdu           ls pdu instance
+     * @param isisNetworkType ISIS network type
+     * @param ownSystemId own system ID
+     */
+    private void callTopologyToSendInfo(LsPdu lsPdu, IsisNetworkType isisNetworkType,
+                                        String ownSystemId) {
+        if ((lsPdu.lspId().equals(ownSystemId + "-00"))) {
+            return;
+        }
+        sendDeviceInfo(createDeviceInfo(lsPdu));
+
+        for (IsisTlv isisTlv : lsPdu.tlvs()) {
+            if (isisTlv instanceof IsExtendedReachability) {
+                IsExtendedReachability isExtendedReachability = (IsExtendedReachability) isisTlv;
+                List<NeighborForExtendedIs> neighbours = isExtendedReachability.neighbours();
+                for (NeighborForExtendedIs teTlv : neighbours) {
+                    String neighbor = teTlv.neighborId();
+                    IsisRouter isisRouter = isisRouterDetails.get(neighbor);
+                    if (isisRouter != null) {
+                        IsisRouter sourceRouter = isisRouterDetails.get(IsisUtil.removeTailingZeros(lsPdu.lspId()));
+                        IsisRouter destinationRouter = isisRouter;
+                        if (sourceRouter.isDis()) {
+                            LinkInformation linkInformation = createLinkInfo(sourceRouter.systemId(),
+                                                                             destinationRouter.systemId(),
+                                                                             sourceRouter.interfaceId(),
+                                                                             destinationRouter.interfaceId(), lsPdu);
+                            controller.addLinkDetails(createIsisLink(linkInformation, lsPdu));
+                        } else if (destinationRouter.isDis()) {
+                            LinkInformation linkInformation1 = createLinkInfo(destinationRouter.systemId(),
+                                                                              sourceRouter.systemId(),
+                                                                              destinationRouter.interfaceId(),
+                                                                              sourceRouter.interfaceId(), lsPdu);
+                            controller.addLinkDetails(createIsisLink(linkInformation1, lsPdu));
+                        } else {
+                            LinkInformation linkInformation = createLinkInfo(sourceRouter.systemId(),
+                                                                             destinationRouter.systemId(),
+                                                                             sourceRouter.interfaceId(),
+                                                                             destinationRouter.interfaceId(), lsPdu);
+                            controller.addLinkDetails(createIsisLink(linkInformation, lsPdu));
+                            LinkInformation linkInformation1 = createLinkInfo(destinationRouter.systemId(),
+                                                                              sourceRouter.systemId(),
+                                                                              destinationRouter.interfaceId(),
+                                                                              sourceRouter.interfaceId(), lsPdu);
+                            controller.addLinkDetails(createIsisLink(linkInformation1, lsPdu));
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Removes topology information from core.
+     *
+     * @param lsPdu ls pdu instance
+     */
+    private void callTopologyToRemoveInfo(LsPdu lsPdu) {
+        String routerId = IsisUtil.removeTailingZeros(lsPdu.lspId());
+        IsisRouter isisRouter = isisRouterDetails.get(routerId);
+        removeDeviceInfo(isisRouter);
+        removeLinkInfo(lsPdu);
+    }
+
+    /**
+     * Sends the device information to topology provider.
+     *
+     * @param isisRouter ISIS router instance
+     */
+    private void sendDeviceInfo(IsisRouter isisRouter) {
+        if (isisRouter.systemId() != null) {
+            controller.addDeviceDetails(isisRouter);
+        }
+    }
+
+    /**
+     * Creates Device instance.
+     *
+     * @param lsPdu ISIS LSPDU instance
+     * @return isisRouter isisRouter instance
+     */
+    public IsisRouter createDeviceInfo(LsPdu lsPdu) {
+        IsisRouter isisRouter = createIsisRouter(lsPdu);
+        if (isisRouter.systemId() != null) {
+            isisRouterDetails.put(isisRouter.systemId(), isisRouter);
+        }
+        return isisRouter;
+    }
+
+    /**
+     * Creates ISIS router instance.
+     *
+     * @param lsPdu lsp instance
+     * @return isisRouter instance
+     */
+    private IsisRouter createIsisRouter(LsPdu lsPdu) {
+        IsisRouter isisRouter = new DefaultIsisRouter();
+        if (IsisUtil.checkIsDis(lsPdu.lspId())) {
+            isisRouter.setDis(true);
+        } else {
+            isisRouter.setDis(false);
+        }
+        isisRouter.setSystemId(IsisUtil.removeTailingZeros(lsPdu.lspId()));
+        for (IsisTlv isisTlv : lsPdu.tlvs()) {
+            if (isisTlv instanceof IsExtendedReachability) {
+                IsExtendedReachability isExtendedReachability = (IsExtendedReachability) isisTlv;
+                List<NeighborForExtendedIs> neighbours = isExtendedReachability.neighbours();
+                for (NeighborForExtendedIs teTlv : neighbours) {
+                    List<TrafficEngineeringSubTlv> teSubTlvs = teTlv.teSubTlv();
+                    for (TrafficEngineeringSubTlv teSubTlv : teSubTlvs) {
+                        if (teSubTlv instanceof InterfaceIpAddress) {
+                            InterfaceIpAddress localIpAddress = (InterfaceIpAddress) teSubTlv;
+                            isisRouter.setInterfaceId(localIpAddress.localInterfaceIPAddress());
+                        } else if (teSubTlv instanceof NeighborIpAddress) {
+                            NeighborIpAddress neighborIpAddress = (NeighborIpAddress) teSubTlv;
+                            isisRouter.setNeighborRouterId(neighborIpAddress.neighborIPAddress());
+                        }
+
+                    }
+                }
+            }
+        }
+        if (isisRouter.interfaceId() == null) {
+            isisRouter.setInterfaceId(IsisConstants.DEFAULTIP);
+        }
+        if (isisRouter.neighborRouterId() == null) {
+            isisRouter.setNeighborRouterId(IsisConstants.DEFAULTIP);
+        }
+        return isisRouter;
+    }
+
+    /**
+     * Creates link information.
+     *
+     * @param localSystemId  local system ID
+     * @param remoteSystemId remote system ID
+     * @return link information
+     * @param interfaceIp interface address
+     * @param neighborIp neighbor address
+     * @param lsPdu link state PDU instance
+     * @return link information instance
+     */
+    public LinkInformation createLinkInfo(String localSystemId, String remoteSystemId,
+                                          Ip4Address interfaceIp, Ip4Address neighborIp,
+                                          LsPdu lsPdu) {
+
+        String linkId = "link:" + localSystemId + "-" + remoteSystemId;
+        LinkInformation linkInformation = new DefaultIsisLinkInformation();
+        linkInformation.setInterfaceIp(interfaceIp);
+        linkInformation.setNeighborIp(neighborIp);
+        linkInformation.setLinkId(linkId);
+        linkInformation.setAlreadyCreated(false);
+        linkInformation.setLinkDestinationId(remoteSystemId);
+        linkInformation.setLinkSourceId(localSystemId);
+
+        return linkInformation;
+    }
+
+    /**
+     * Removes the device information from topology provider.
+     *
+     * @param isisRouter ISIS router instance
+     */
+    private void removeDeviceInfo(IsisRouter isisRouter) {
+        if (isisRouter.systemId() != null) {
+            controller.removeDeviceDetails(isisRouter);
+        }
+        isisRouterDetails.remove(isisRouter.systemId());
+    }
+
+
+    /**
+     * Removes the link information from topology provider.
+     *
+     * @param lsPdu ls pdu instance
+     */
+    private void removeLinkInfo(LsPdu lsPdu) {
+        Map<String, LinkInformation> linkInformationList = deviceAndLink.removeLinkInfo(lsPdu.lspId());
+        for (String key : linkInformationList.keySet()) {
+            LinkInformation linkInformation = linkInformationList.get(key);
+            controller.removeLinkDetails(createIsisLink(linkInformation, lsPdu));
+        }
+    }
+
+    /**
+     * Creates ISIS link instance.
+     *
+     * @param linkInformation link information instance
+     * @return isisLink instance
+     */
+    private IsisLink createIsisLink(LinkInformation linkInformation, LsPdu lsPdu) {
+        IsisLink isisLink = new DefaultIsisLink();
+        isisLink.setLocalSystemId(linkInformation.linkSourceId());
+        isisLink.setRemoteSystemId(linkInformation.linkDestinationId());
+        isisLink.setInterfaceIp(linkInformation.interfaceIp());
+        isisLink.setNeighborIp(linkInformation.neighborIp());
+        isisLink.setLinkTed(createIsisLinkTedInfo(lsPdu));
+        return isisLink;
+    }
+
+    /**
+     * Creates the ISIS link TED information.
+     *
+     * @param lsPdu link state PDU
+     * @return isisLinkTed
+     */
+    public IsisLinkTed createIsisLinkTedInfo(LsPdu lsPdu) {
+        IsisLinkTed isisLinkTed = new DefaultIsisLinkTed();
+        for (IsisTlv isisTlv : lsPdu.tlvs()) {
+            if (isisTlv instanceof IsExtendedReachability) {
+                IsExtendedReachability isExtendedReachability = (IsExtendedReachability) isisTlv;
+                List<NeighborForExtendedIs> neighbours = isExtendedReachability.neighbours();
+                for (NeighborForExtendedIs teTlv : neighbours) {
+                    List<TrafficEngineeringSubTlv> teSubTlvs = teTlv.teSubTlv();
+                    for (TrafficEngineeringSubTlv teSubTlv : teSubTlvs) {
+                        if (teSubTlv instanceof AdministrativeGroup) {
+                            AdministrativeGroup ag = (AdministrativeGroup) teSubTlv;
+                            isisLinkTed.setAdministrativeGroup(ag.administrativeGroup());
+                        }
+                        if (teSubTlv instanceof InterfaceIpAddress) {
+                            InterfaceIpAddress localIpAddress = (InterfaceIpAddress) teSubTlv;
+                            isisLinkTed.setIpv4InterfaceAddress(localIpAddress.localInterfaceIPAddress());
+                        }
+                        if (teSubTlv instanceof NeighborIpAddress) {
+                            NeighborIpAddress neighborIpAddress = (NeighborIpAddress) teSubTlv;
+                            isisLinkTed.setIpv4NeighborAddress(neighborIpAddress.neighborIPAddress());
+                        }
+                        if (teSubTlv instanceof TrafficEngineeringMetric) {
+                            TrafficEngineeringMetric teM = (TrafficEngineeringMetric) teSubTlv;
+                            isisLinkTed.setTeDefaultMetric(teM.getTrafficEngineeringMetricValue());
+                        }
+                        if (teSubTlv instanceof MaximumBandwidth) {
+                            MaximumBandwidth maxLinkBandwidth = (MaximumBandwidth) teSubTlv;
+                            isisLinkTed.setMaximumLinkBandwidth(
+                                    Bandwidth.bps(maxLinkBandwidth.getMaximumBandwidthValue()));
+                        }
+                        if (teSubTlv instanceof MaximumReservableBandwidth) {
+                            MaximumReservableBandwidth maxReservableBw = (MaximumReservableBandwidth) teSubTlv;
+                            isisLinkTed.setMaximumReservableLinkBandwidth(
+                                    Bandwidth.bps(maxReservableBw.getMaximumBandwidthValue()));
+                        }
+                        if (teSubTlv instanceof UnreservedBandwidth) {
+                            UnreservedBandwidth unReservedBandwidth = (UnreservedBandwidth) teSubTlv;
+                            List<Bandwidth> bandwidthList = new ArrayList<>();
+                            List<Float> unReservedBandwidthList = unReservedBandwidth.unReservedBandwidthValue();
+                            for (Float unReservedBandwidthFloatValue : unReservedBandwidthList) {
+                                Bandwidth bandwidth = Bandwidth.bps(unReservedBandwidthFloatValue);
+                                bandwidthList.add(bandwidth);
+                            }
+                            isisLinkTed.setUnreservedBandwidth(bandwidthList);
+                        }
+                    }
+                }
+            }
+        }
+        return isisLinkTed;
+    }
+}
\ No newline at end of file
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/DefaultIsisLsdb.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/DefaultIsisLsdb.java
old mode 100644
new mode 100755
index 3c66bf8..2062ccc
--- a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/DefaultIsisLsdb.java
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/DefaultIsisLsdb.java
@@ -21,17 +21,24 @@
 import org.onosproject.isis.controller.IsisLsdbAge;
 import org.onosproject.isis.controller.IsisLspBin;
 import org.onosproject.isis.controller.IsisMessage;
+import org.onosproject.isis.controller.IsisNeighbor;
 import org.onosproject.isis.controller.IsisPduType;
+import org.onosproject.isis.controller.IsisRouterType;
 import org.onosproject.isis.controller.LspWrapper;
+import org.onosproject.isis.controller.impl.Controller;
+import org.onosproject.isis.controller.impl.LspEventConsumer;
 import org.onosproject.isis.io.isispacket.pdu.LsPdu;
 import org.onosproject.isis.io.util.IsisConstants;
 import org.onosproject.isis.io.util.IsisUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CopyOnWriteArrayList;
 
@@ -43,10 +50,14 @@
     private Map<String, LspWrapper> isisL1Db = new ConcurrentHashMap<>();
     private Map<String, LspWrapper> isisL2Db = new ConcurrentHashMap<>();
     private IsisLsdbAge lsdbAge = null;
+    private Controller controller = null;
+    private List<IsisInterface> isisInterfaceList = new ArrayList<>();
 
 
     private int l1LspSeqNo = IsisConstants.STARTLSSEQUENCENUM;
     private int l2LspSeqNo = IsisConstants.STARTLSSEQUENCENUM;
+    private LspEventConsumer queueConsumer = null;
+    private BlockingQueue<LspWrapper> lspForProviderQueue = new ArrayBlockingQueue<>(1024);
 
     /**
      * Creates an instance of ISIS LSDB.
@@ -56,10 +67,30 @@
     }
 
     /**
+     * Sets the controller instance.
+     *
+     * @param controller controller instance
+     */
+    public void setController(Controller controller) {
+        this.controller = controller;
+    }
+
+    /**
+     * Sets the list of IsisInterface instance.
+     *
+     * @param isisInterfaceList isisInterface instance
+     */
+    public void setIsisInterface(List<IsisInterface> isisInterfaceList) {
+        this.isisInterfaceList = isisInterfaceList;
+    }
+
+    /**
      * Initializes the link state database.
      */
     public void initializeDb() {
         lsdbAge.startDbAging();
+        queueConsumer = new LspEventConsumer(lspForProviderQueue, controller);
+        new Thread(queueConsumer).start();
     }
 
     /**
@@ -96,7 +127,6 @@
         return lspKey.toString();
     }
 
-
     /**
      * Returns the neighbor L1 database information.
      *
@@ -215,7 +245,7 @@
             byte[] lspBytes = lspdu.asBytes();
             lspdu.setPduLength(lspBytes.length);
             lspBytes = IsisUtil.addChecksum(lspBytes, IsisConstants.CHECKSUMPOSITION,
-                                            IsisConstants.CHECKSUMPOSITION + 1);
+                    IsisConstants.CHECKSUMPOSITION + 1);
             byte[] checkSum = {lspBytes[IsisConstants.CHECKSUMPOSITION], lspBytes[IsisConstants.CHECKSUMPOSITION + 1]};
             lspdu.setCheckSum(ChannelBuffers.copiedBuffer(checkSum).readUnsignedShort());
         }
@@ -236,6 +266,14 @@
         addLsp(lspWrapper, lspdu.lspId());
 
         log.debug("Added LSp In LSDB: {}", lspWrapper);
+        try {
+            if (!lspWrapper.isSelfOriginated()) {
+                lspWrapper.setLspProcessing(IsisConstants.LSPADDED);
+                lspForProviderQueue.put(lspWrapper);
+            }
+        } catch (Exception e) {
+            log.debug("Added LSp In Blocking queue: {}", lspWrapper);
+        }
         return true;
     }
 
@@ -273,9 +311,10 @@
             lspBin.addIsisLsp(key, lspWrapper);
             lsdbAge.addLspBin(binNumber, lspBin);
             log.debug("Added Type {} LSP to LSDB and LSABin[{}], Remaining life time of LSA {}",
-                      lspWrapper.lsPdu().isisPduType(),
-                      binNumber, lspWrapper.remainingLifetime());
+                    lspWrapper.lsPdu().isisPduType(),
+                    binNumber, lspWrapper.remainingLifetime());
         }
+
         return false;
     }
 
@@ -337,6 +376,7 @@
     public void deleteLsp(IsisMessage lspMessage) {
         LsPdu lsp = (LsPdu) lspMessage;
         String lspKey = lsp.lspId();
+        LspWrapper lspWrapper = findLsp(lspMessage.isisPduType(), lspKey);
         switch (lsp.isisPduType()) {
             case L1LSPDU:
                 isisL1Db.remove(lspKey);
@@ -348,5 +388,47 @@
                 log.debug("Unknown LSP type to remove..!!!");
                 break;
         }
+
+        try {
+            lspWrapper.setLspProcessing(IsisConstants.LSPREMOVED);
+            lspForProviderQueue.put(lspWrapper);
+        } catch (Exception e) {
+            log.debug("Added LSp In Blocking queue: {}", lspWrapper);
+        }
+    }
+
+    /**
+     * Removes topology information when neighbor down.
+     *
+     * @param neighbor      ISIS neighbor instance
+     * @param isisInterface ISIS interface instance
+     */
+    public void removeTopology(IsisNeighbor neighbor, IsisInterface isisInterface) {
+        String lspKey = neighbor.neighborSystemId() + ".00-00";
+        LspWrapper lspWrapper = null;
+        switch (IsisRouterType.get(isisInterface.reservedPacketCircuitType())) {
+            case L1:
+                lspWrapper = findLsp(IsisPduType.L1LSPDU, lspKey);
+                break;
+            case L2:
+                lspWrapper = findLsp(IsisPduType.L2LSPDU, lspKey);
+                break;
+            case L1L2:
+                lspWrapper = findLsp(IsisPduType.L1LSPDU, lspKey);
+                if (lspWrapper == null) {
+                    lspWrapper = findLsp(IsisPduType.L2LSPDU, lspKey);
+                }
+                break;
+            default:
+                log.debug("Unknown type");
+        }
+        try {
+            if (lspWrapper != null) {
+                lspWrapper.setLspProcessing(IsisConstants.LSPREMOVED);
+                lspForProviderQueue.put(lspWrapper);
+            }
+        } catch (Exception e) {
+            log.debug("Added LSp In Blocking queue: {}", lspWrapper);
+        }
     }
 }
\ No newline at end of file
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/DefaultIsisLsdbAge.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/DefaultIsisLsdbAge.java
index 9ceb97c..790d3ae 100644
--- a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/DefaultIsisLsdbAge.java
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/DefaultIsisLsdbAge.java
@@ -231,7 +231,6 @@
         }
     }
 
-
     /**
      * Runnable task which runs every second and calls aging process.
      */
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/IsisLspQueueConsumer.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/IsisLspQueueConsumer.java
index b5eca27..c2626d4 100644
--- a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/IsisLspQueueConsumer.java
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/lsdb/IsisLspQueueConsumer.java
@@ -58,12 +58,12 @@
                     switch (lspProcessing) {
                         case IsisConstants.REFRESHLSP:
                             log.debug("LSPQueueConsumer: Message - " + IsisConstants.REFRESHLSP +
-                                              " consumed.");
+                                    " consumed.");
                             processRefreshLsp(wrapper);
                             break;
                         case IsisConstants.MAXAGELSP:
                             log.debug("LSPQueueConsumer: Message - " + IsisConstants.MAXAGELSP +
-                                              " consumed.");
+                                    " consumed.");
                             processMaxAgeLsa(wrapper);
                             break;
                         default:
@@ -72,7 +72,6 @@
                     }
                 }
             }
-
         } catch (Exception e) {
             log.debug("Error::LSPQueueConsumer::{}", e.getMessage());
         }
@@ -94,19 +93,18 @@
                 lsPdu.setRemainingLifeTime(IsisConstants.LSPMAXAGE);
                 byte[] lspBytes = lsPdu.asBytes();
                 lspBytes = IsisUtil.addLengthAndMarkItInReserved(lspBytes, IsisConstants.LENGTHPOSITION,
-                                                                 IsisConstants.LENGTHPOSITION + 1,
-                                                                 IsisConstants.RESERVEDPOSITION);
+                        IsisConstants.LENGTHPOSITION + 1,
+                        IsisConstants.RESERVEDPOSITION);
                 lspBytes = IsisUtil.addChecksum(lspBytes, IsisConstants.CHECKSUMPOSITION,
-                                                IsisConstants.CHECKSUMPOSITION + 1);
+                        IsisConstants.CHECKSUMPOSITION + 1);
                 //write to the channel
                 channel.write(IsisUtil.framePacket(lspBytes, isisInterface.interfaceIndex()));
                 // Updating the database with resetting remaining life time to default.
                 IsisLsdb isisDb = isisInterface.isisLsdb();
                 isisDb.addLsp(lsPdu, true, isisInterface);
                 log.debug("LSPQueueConsumer: processRefreshLsp - Flooded SelfOriginated LSP {}",
-                          wrapper.lsPdu());
+                        wrapper.lsPdu());
             }
-
         }
     }
 
@@ -124,7 +122,7 @@
             IsisLsdb isisDb = isisInterface.isisLsdb();
             isisDb.deleteLsp(lsPdu);
             log.debug("LSPQueueConsumer: processMaxAgeLsp - Removed-Max Age LSP {}",
-                      wrapper.lsPdu());
+                    wrapper.lsPdu());
         }
     }
 }
\ No newline at end of file
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisLink.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisLink.java
new file mode 100644
index 0000000..2df4276
--- /dev/null
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisLink.java
@@ -0,0 +1,118 @@
+/*
+ * 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.isis.controller.impl.topology;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.isis.controller.topology.IsisLink;
+import org.onosproject.isis.controller.topology.IsisLinkTed;
+
+/**
+ * Representation of an ISIS Link.
+ */
+public class DefaultIsisLink implements IsisLink {
+
+    private String remoteSystemId;
+    private String localSystemId;
+    private Ip4Address interfaceIp;
+    private Ip4Address neighborIp;
+    private IsisLinkTed linkTed;
+
+    @Override
+    public String remoteSystemId() {
+        return this.remoteSystemId;
+    }
+
+    @Override
+    public String localSystemId() {
+        return this.localSystemId;
+    }
+
+    @Override
+    public Ip4Address interfaceIp() {
+        return this.interfaceIp;
+    }
+
+    @Override
+    public Ip4Address neighborIp() {
+        return this.neighborIp;
+    }
+
+    @Override
+    public IsisLinkTed linkTed() {
+        return this.linkTed;
+    }
+
+    @Override
+    public void setRemoteSystemId(String remoteSystemId) {
+        this.remoteSystemId = remoteSystemId;
+    }
+
+    @Override
+    public void setLocalSystemId(String localSystemId) {
+        this.localSystemId = localSystemId;
+    }
+
+    @Override
+    public void setInterfaceIp(Ip4Address interfaceIp) {
+        this.interfaceIp = interfaceIp;
+    }
+
+    @Override
+    public void setNeighborIp(Ip4Address neighborIp) {
+        this.neighborIp = neighborIp;
+    }
+
+    @Override
+    public void setLinkTed(IsisLinkTed linkTed) {
+        this.linkTed = linkTed;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("remoteSystemId", remoteSystemId)
+                .add("localSystemId", localSystemId)
+                .add("interfaceIp", interfaceIp)
+                .add("neighborIp", neighborIp)
+                .add("linkTed", linkTed)
+                .toString();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultIsisLink that = (DefaultIsisLink) o;
+        return Objects.equal(remoteSystemId, that.remoteSystemId) &&
+                Objects.equal(localSystemId, that.localSystemId) &&
+                Objects.equal(interfaceIp, that.interfaceIp) &&
+                Objects.equal(neighborIp, that.neighborIp) &&
+                Objects.equal(linkTed, that.linkTed);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(remoteSystemId, localSystemId, interfaceIp, neighborIp, linkTed);
+    }
+}
\ No newline at end of file
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisLinkInformation.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisLinkInformation.java
new file mode 100644
index 0000000..574f440
--- /dev/null
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisLinkInformation.java
@@ -0,0 +1,166 @@
+/*
+ * 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.isis.controller.impl.topology;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.isis.controller.topology.LinkInformation;
+
+/**
+ * Representation of an ISIS link information..
+ */
+public class DefaultIsisLinkInformation implements LinkInformation {
+
+    String linkId;
+    String linkSourceId;
+    String linkDestinationId;
+    Ip4Address interfaceIp;
+    Ip4Address neighborIp;
+    boolean alreadyCreated;
+
+    /**
+     * Gets link id.
+     *
+     * @return link id
+     */
+    public String linkId() {
+        return linkId;
+    }
+
+    /**
+     * Sets link id.DefaultIsisDeviceInformation.
+     *
+     * @param linkId link id
+     */
+    public void setLinkId(String linkId) {
+        this.linkId = linkId;
+    }
+
+    /**
+     * Gets is already created or not.
+     *
+     * @return true if already created else false
+     */
+    public boolean isAlreadyCreated() {
+        return alreadyCreated;
+    }
+
+    /**
+     * Sets is already created or not.
+     *
+     * @param alreadyCreated true or false
+     */
+    public void setAlreadyCreated(boolean alreadyCreated) {
+        this.alreadyCreated = alreadyCreated;
+    }
+
+    /**
+     * Gets link destination id.
+     *
+     * @return link destination id
+     */
+    public String linkDestinationId() {
+        return linkDestinationId;
+    }
+
+    /**
+     * Sets link destination id.
+     *
+     * @param linkDestinationId link destination id
+     */
+    public void setLinkDestinationId(String linkDestinationId) {
+        this.linkDestinationId = linkDestinationId;
+    }
+
+    /**
+     * Gets link source id.
+     *
+     * @return link source id
+     */
+    public String linkSourceId() {
+        return linkSourceId;
+    }
+
+    /**
+     * Sets link source id.
+     *
+     * @param linkSourceId link source id
+     */
+    public void setLinkSourceId(String linkSourceId) {
+        this.linkSourceId = linkSourceId;
+    }
+
+    /**
+     * Gets interface IP address.
+     *
+     * @return interface IP address
+     */
+    public Ip4Address interfaceIp() {
+        return interfaceIp;
+    }
+
+    /**
+     * Sets interface IP address.
+     *
+     * @param interfaceIp interface IP address
+     */
+    public void setInterfaceIp(Ip4Address interfaceIp) {
+        this.interfaceIp = interfaceIp;
+    }
+
+    @Override
+    public Ip4Address neighborIp() {
+        return this.neighborIp;
+    }
+
+    @Override
+    public void setNeighborIp(Ip4Address neighborIp) {
+        this.neighborIp = neighborIp;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("linkId", linkId)
+                .add("linkSourceId", linkSourceId)
+                .add("linkDestinationId", linkDestinationId)
+                .add("interfaceIp", interfaceIp)
+                .toString();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultIsisLinkInformation that = (DefaultIsisLinkInformation) o;
+        return Objects.equal(linkId, that.linkId) &&
+                Objects.equal(linkSourceId, that.linkSourceId) &&
+                Objects.equal(linkDestinationId, that.linkDestinationId) &&
+                Objects.equal(interfaceIp, that.interfaceIp);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(linkId, linkSourceId, linkDestinationId,
+                interfaceIp);
+    }
+}
\ No newline at end of file
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisLinkTed.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisLinkTed.java
new file mode 100644
index 0000000..6122c9a
--- /dev/null
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisLinkTed.java
@@ -0,0 +1,145 @@
+/*
+ * 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.isis.controller.impl.topology;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import org.onlab.packet.Ip4Address;
+import org.onlab.util.Bandwidth;
+import org.onosproject.isis.controller.topology.IsisLinkTed;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Representation of an ISIS device information.
+ */
+public class DefaultIsisLinkTed implements IsisLinkTed {
+    private int administrativeGroup;
+    private Ip4Address ipv4InterfaceAddress;
+    private Ip4Address ipv4NeighborAddress;
+    private Bandwidth maximumLinkBandwidth;
+    private Bandwidth maximumReservableLinkBandwidth;
+    private List<Bandwidth> unreservedBandwidth = new ArrayList<>();
+    private long teDefaultMetric;
+
+    @Override
+    public int administrativeGroup() {
+        return administrativeGroup;
+    }
+
+    @Override
+    public void setAdministrativeGroup(int administrativeGroup) {
+        this.administrativeGroup = administrativeGroup;
+    }
+
+    @Override
+    public Ip4Address ipv4InterfaceAddress() {
+        return ipv4InterfaceAddress;
+    }
+
+    @Override
+    public void setIpv4InterfaceAddress(Ip4Address interfaceAddress) {
+        this.ipv4InterfaceAddress = interfaceAddress;
+    }
+
+    @Override
+    public Ip4Address ipv4NeighborAddress() {
+        return ipv4NeighborAddress;
+    }
+
+    @Override
+    public void setIpv4NeighborAddress(Ip4Address neighborAddress) {
+        this.ipv4NeighborAddress = neighborAddress;
+    }
+
+    @Override
+    public Bandwidth maximumLinkBandwidth() {
+        return maximumLinkBandwidth;
+    }
+
+    @Override
+    public void setMaximumLinkBandwidth(Bandwidth bandwidth) {
+        this.maximumLinkBandwidth = bandwidth;
+    }
+
+    @Override
+    public Bandwidth maximumReservableLinkBandwidth() {
+        return maximumReservableLinkBandwidth;
+    }
+
+    @Override
+    public void setMaximumReservableLinkBandwidth(Bandwidth bandwidth) {
+        this.maximumReservableLinkBandwidth = bandwidth;
+    }
+
+    @Override
+    public List<Bandwidth> unreservedBandwidth() {
+        return this.unreservedBandwidth;
+    }
+
+    @Override
+    public void setUnreservedBandwidth(List<Bandwidth> bandwidth) {
+        this.unreservedBandwidth.addAll(bandwidth);
+    }
+
+    @Override
+    public long teDefaultMetric() {
+        return teDefaultMetric;
+    }
+
+    @Override
+    public void setTeDefaultMetric(long teMetric) {
+        this.teDefaultMetric = teMetric;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("administrativeGroup", administrativeGroup)
+                .add("ipv4InterfaceAddress", ipv4InterfaceAddress)
+                .add("ipv4NeighborAddress", ipv4NeighborAddress)
+                .add("maximumLinkBandwidth", maximumLinkBandwidth)
+                .add("maximumReservableLinkBandwidth", maximumReservableLinkBandwidth)
+                .add("teDefaultMetric", teDefaultMetric)
+                .toString();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultIsisLinkTed that = (DefaultIsisLinkTed) o;
+        return Objects.equal(administrativeGroup, that.administrativeGroup) &&
+                Objects.equal(ipv4InterfaceAddress, that.ipv4InterfaceAddress) &&
+                Objects.equal(ipv4NeighborAddress, that.ipv4NeighborAddress) &&
+                Objects.equal(maximumLinkBandwidth, that.maximumLinkBandwidth) &&
+                Objects.equal(maximumReservableLinkBandwidth,
+                              that.maximumReservableLinkBandwidth) &&
+                Objects.equal(teDefaultMetric, that.teDefaultMetric);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(administrativeGroup, ipv4InterfaceAddress,
+                                ipv4NeighborAddress, maximumLinkBandwidth, teDefaultMetric);
+    }
+}
\ No newline at end of file
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisRouter.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisRouter.java
new file mode 100644
index 0000000..216ce37
--- /dev/null
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/DefaultIsisRouter.java
@@ -0,0 +1,132 @@
+/*
+ * 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.isis.controller.impl.topology;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.isis.controller.topology.IsisRouter;
+
+/**
+ * Representation of an ISIS Router.
+ */
+public class DefaultIsisRouter implements IsisRouter {
+
+    private String systemId;
+    private Ip4Address neighborRouterId;
+    private Ip4Address interfaceId;
+    private boolean isDis;
+
+    /**
+     * Gets the system ID.
+     *
+     * @return systemId system ID
+     */
+    public String systemId() {
+        return systemId;
+    }
+
+    /**
+     * Sets IP address of the Router.
+     */
+    public void setSystemId(String systemId) {
+        this.systemId = systemId;
+    }
+
+    /**
+     * Gets IP address of the interface.
+     *
+     * @return IP address of the interface
+     */
+    public Ip4Address interfaceId() {
+        return interfaceId;
+    }
+
+    /**
+     * Gets IP address of the interface.
+     *
+     * @param interfaceId IP address of the interface
+     */
+    public void setInterfaceId(Ip4Address interfaceId) {
+        this.interfaceId = interfaceId;
+    }
+
+    /**
+     * Gets neighbor's Router id.
+     *
+     * @return neighbor's Router id
+     */
+    public Ip4Address neighborRouterId() {
+        return neighborRouterId;
+    }
+
+    /**
+     * Sets neighbor's Router id.
+     *
+     * @param advertisingRouterId neighbor's Router id
+     */
+    public void setNeighborRouterId(Ip4Address advertisingRouterId) {
+        this.neighborRouterId = advertisingRouterId;
+    }
+
+    /**
+     * Gets if DR or not.
+     *
+     * @return true if DR else false
+     */
+    public boolean isDis() {
+        return isDis;
+    }
+
+    /**
+     * Sets dis or not.
+     *
+     * @param dis true if DIS else false
+     */
+    public void setDis(boolean dis) {
+        isDis = dis;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("systemId", systemId)
+                .add("neighborRouterId", neighborRouterId)
+                .add("interfaceId", interfaceId)
+                .toString();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultIsisRouter that = (DefaultIsisRouter) o;
+        return Objects.equal(systemId, that.systemId) &&
+                Objects.equal(neighborRouterId, that.neighborRouterId) &&
+                Objects.equal(interfaceId, that.interfaceId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(systemId, neighborRouterId, interfaceId);
+    }
+}
\ No newline at end of file
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/TopologyForDeviceAndLinkImpl.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/TopologyForDeviceAndLinkImpl.java
new file mode 100644
index 0000000..8682a4a
--- /dev/null
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/TopologyForDeviceAndLinkImpl.java
@@ -0,0 +1,490 @@
+/*
+* 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.isis.controller.impl.topology;
+
+import org.onlab.util.Bandwidth;
+import org.onosproject.isis.controller.topology.DeviceInformation;
+import org.onosproject.isis.controller.topology.IsisRouter;
+import org.onosproject.isis.controller.topology.LinkInformation;
+import org.onosproject.isis.controller.topology.TopologyForDeviceAndLink;
+import org.onosproject.isis.controller.topology.IsisLinkTed;
+import org.onosproject.isis.io.isispacket.pdu.LsPdu;
+import org.onosproject.isis.io.isispacket.tlv.IsExtendedReachability;
+import org.onosproject.isis.io.isispacket.tlv.IsisTlv;
+import org.onosproject.isis.io.isispacket.tlv.NeighborForExtendedIs;
+
+import org.onosproject.isis.io.isispacket.tlv.subtlv.TrafficEngineeringSubTlv;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.InterfaceIpAddress;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.NeighborIpAddress;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.AdministrativeGroup;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.TrafficEngineeringMetric;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.UnreservedBandwidth;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.MaximumReservableBandwidth;
+import org.onosproject.isis.io.isispacket.tlv.subtlv.MaximumBandwidth;
+import org.onosproject.isis.io.util.IsisConstants;
+import org.onosproject.isis.io.util.IsisUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Represents device and link topology information.
+ */
+public class TopologyForDeviceAndLinkImpl implements TopologyForDeviceAndLink {
+
+    private static final Logger log = LoggerFactory.getLogger(TopologyForDeviceAndLinkImpl.class);
+    private Map<String, DeviceInformation> deviceInformationMap = new LinkedHashMap<>();
+    private Map<String, IsisRouter> isisRouterDetails = new LinkedHashMap<>();
+    private Map<String, DeviceInformation> deviceInformationMapForPointToPoint = new LinkedHashMap<>();
+    private Map<String, DeviceInformation> deviceInformationMapToDelete = new LinkedHashMap<>();
+    private Map<String, LinkInformation> addedLinkInformationMap = new LinkedHashMap<>();
+
+    /**
+     * Gets device information.
+     *
+     * @return device information
+     */
+    public Map<String, DeviceInformation> deviceInformationMap() {
+        return deviceInformationMap;
+    }
+
+    /**
+     * Gets ISIS router list information.
+     *
+     * @return router information
+     */
+    public Map<String, IsisRouter> isisDeviceList() {
+        return isisRouterDetails;
+    }
+
+    /**
+     * Sets device information.
+     *
+     * @param key                  key used to add in map
+     * @param deviceInformationMap device information instance
+     */
+    public void setDeviceInformationMap(String key, DeviceInformation deviceInformationMap) {
+        if (deviceInformationMap != null) {
+            this.deviceInformationMap.put(key, deviceInformationMap);
+        }
+
+    }
+
+    /**
+     * Gets deviceInformation as map for Point-To-Point.
+     *
+     * @return deviceInformationMap
+     */
+    public Map<String, DeviceInformation> deviceInformationMapForPointToPoint() {
+        return deviceInformationMapForPointToPoint;
+    }
+
+    /**
+     * Sets deviceInformation as map for Point-To-Point..
+     *
+     * @param key                  key used to add in map
+     * @param deviceInformationMap device information instance
+     */
+    public void setDeviceInformationMapForPointToPoint(String key, DeviceInformation deviceInformationMap) {
+        if (deviceInformationMap != null) {
+            this.deviceInformationMapForPointToPoint.put(key, deviceInformationMap);
+        }
+
+    }
+
+    /**
+     * Gets deviceInformation as map.
+     *
+     * @return deviceInformationMap to delete from core
+     */
+    public Map<String, DeviceInformation> deviceInformationMapToDelete() {
+        return deviceInformationMapToDelete;
+    }
+
+    /**
+     * Sets device information for removal.
+     *
+     * @param key                          ket used to add in map
+     * @param deviceInformationMapToDelete map from device information to remove
+     */
+    public void setDeviceInformationMapToDelete(String key, DeviceInformation deviceInformationMapToDelete) {
+        if (deviceInformationMapToDelete != null) {
+            this.deviceInformationMapToDelete.put(key, deviceInformationMapToDelete);
+        }
+    }
+
+    /**
+     * Removes Device Information.
+     *
+     * @param key ket used to remove from map
+     */
+    public void removeDeviceInformationMapFromDeleteMap(String key) {
+        removeDeviceInformationMap(key);
+        if (this.deviceInformationMapToDelete.containsKey(key)) {
+            this.deviceInformationMapToDelete.remove(key);
+        }
+    }
+
+    /**
+     * Gets Device Information.
+     *
+     * @param key system id as key to store in map
+     * @return Device Information
+     */
+    public DeviceInformation deviceInformation(String key) {
+        DeviceInformation deviceInformation = this.deviceInformationMap.get(key);
+        return deviceInformation;
+    }
+
+    /**
+     * Removes Device Information from map.
+     *
+     * @param key key used to remove from map
+     */
+    public void removeDeviceInformationMap(String key) {
+        if (this.deviceInformationMap.containsKey(key)) {
+            this.deviceInformationMap.remove(key);
+        }
+    }
+
+    @Override
+    public void removeLinks(String linkId) {
+        this.addedLinkInformationMap.remove(linkId);
+    }
+
+    /**
+     * Gets link information as map.
+     *
+     * @return link information as map
+     */
+    public Map<String, LinkInformation> linkInformationMap() {
+        return addedLinkInformationMap;
+    }
+
+    private LinkInformation getLinkInformation(String key) {
+        LinkInformation linkInformation = this.addedLinkInformationMap.get(key);
+        return linkInformation;
+    }
+
+    /**
+     * Sets link information in map.
+     *
+     * @param key                key used to add in map
+     * @param linkInformationMap link information instance
+     */
+    public void setLinkInformationMap(String key, LinkInformation linkInformationMap) {
+        if (!this.addedLinkInformationMap.containsKey(key)) {
+            this.addedLinkInformationMap.put(key, linkInformationMap);
+        }
+    }
+
+    /**
+     * Gets linkInformation as map for PointToPoint.
+     *
+     * @return linkInformationMap
+     */
+    public Map<String, LinkInformation> linkInformationMapForPointToPoint() {
+        return addedLinkInformationMap;
+    }
+
+    /**
+     * Sets linkInformation as map for PointToPoint.
+     *
+     * @param key                key used to add in map
+     * @param linkInformationMap link information instance
+     */
+    public void setLinkInformationMapForPointToPoint(String key, LinkInformation linkInformationMap) {
+        if (!this.addedLinkInformationMap.containsKey(key)) {
+            this.addedLinkInformationMap.put(key, linkInformationMap);
+        }
+    }
+
+    /**
+     * Removes Link Information from linkInformationMap.
+     *
+     * @param key key used to remove in map
+     */
+    public void removeLinkInformationMap(String key) {
+        if (this.addedLinkInformationMap.containsKey(key)) {
+            this.addedLinkInformationMap.remove(key);
+        }
+    }
+
+    /**
+     * Returns the ISIS router instance.
+     *
+     * @param systemId system ID to get router details
+     * @return ISIS router instance
+     */
+    public IsisRouter isisRouter(String systemId) {
+        String routerId = IsisUtil.removeTailingZeros(systemId);
+        IsisRouter isisRouter = isisRouterDetails.get(routerId);
+        if (isisRouter != null) {
+            return isisRouter;
+        } else {
+            log.debug("IsisRouter is not available");
+            IsisRouter isisRouterCheck = new DefaultIsisRouter();
+            isisRouterCheck.setSystemId(routerId);
+            return isisRouterCheck;
+        }
+    }
+
+    /**
+     * Removes the ISIS router instance from map.
+     *
+     * @param systemId system ID to remove router details
+     */
+    public void removeRouter(String systemId) {
+        String routerId = IsisUtil.removeTailingZeros(systemId);
+        isisRouterDetails.remove(systemId);
+    }
+
+    /**
+     * Creates Device instance.
+     *
+     * @param lsPdu ISIS LSPDU instance
+     * @return isisRouter isisRouter instance
+     */
+    public IsisRouter createDeviceInfo(LsPdu lsPdu) {
+        IsisRouter isisRouter = createIsisRouter(lsPdu);
+
+        if (isisRouter.systemId() != null) {
+            if (isisRouter.interfaceId() == null && isisRouter.neighborRouterId() == null) {
+                isisRouter.setInterfaceId(IsisConstants.DEFAULTIP);
+                isisRouter.setNeighborRouterId(IsisConstants.DEFAULTIP);
+                isisRouterDetails.put(isisRouter.systemId(), isisRouter);
+            }
+        }
+        return isisRouter;
+    }/*
+
+    *//**
+     * Removes Device and Link instance.
+     *
+     * @param lsPdu ISIS LSPDU instance
+     * @return isisRouter isisRouter instance
+     *//*
+    public IsisRouter removeDeviceAndLinkInfo(LsPdu lsPdu) {
+        IsisRouter isisRouter = createIsisRouter(lsPdu);
+        return isisRouter;
+    }*/
+
+    /**
+     * Creates link information.
+     *
+     * @param lsPdu       ls pdu instance
+     * @param ownSystemId system ID
+     * @return link information
+     */
+    public Map<String, LinkInformation> createLinkInfo(LsPdu lsPdu, String ownSystemId) {
+        for (IsisTlv isisTlv : lsPdu.tlvs()) {
+            if (isisTlv instanceof IsExtendedReachability) {
+                IsExtendedReachability isExtendedReachability = (IsExtendedReachability) isisTlv;
+                List<NeighborForExtendedIs> neighborForExtendedIsList = isExtendedReachability.neighbours();
+                for (NeighborForExtendedIs neighbor : neighborForExtendedIsList) {
+                    String neighbourId = neighbor.neighborId();
+                    String routerId = IsisUtil.removeTailingZeros(lsPdu.lspId());
+                    if (!(neighbourId.equals(ownSystemId))) {
+                        IsisRouter isisRouter = isisRouterDetails.get(neighbourId);
+                        if (isisRouter != null) {
+                            String linkId = "link:" + routerId + "-" + neighbourId;
+                            addedLinkInformationMap.put(linkId, createLinkInformation(lsPdu, linkId,
+                                    routerId, neighbourId));
+                        } else {
+                            createIsisRouterDummy(neighbourId);
+                            String linkId = "link:" + routerId + "-" + neighbourId;
+                            LinkInformation linkInformation = createLinkInformation(lsPdu, linkId,
+                                    routerId, neighbourId);
+                            linkInformation.setAlreadyCreated(true);
+                            addedLinkInformationMap.put(linkId, linkInformation);
+                        }
+                    }
+
+                }
+            }
+        }
+        return addedLinkInformationMap;
+    }
+
+    /**
+     * Removes link information.
+     *
+     * @param systemId system ID to remove link information
+     * @return updated link information
+     */
+    public Map<String, LinkInformation> removeLinkInfo(String systemId) {
+        String routerId = IsisUtil.removeTailingZeros(systemId);
+        Map<String, LinkInformation> removeLinkInformationMap = new LinkedHashMap<>();
+        for (String key : addedLinkInformationMap.keySet()) {
+            if (key.contains(routerId)) {
+                removeLinkInformationMap.put(key, addedLinkInformationMap.get(key));
+            }
+        }
+        return removeLinkInformationMap;
+    }
+
+    /**
+     * Creates link information.
+     *
+     * @param lsPdu       link state pdu
+     * @param linkId      link id
+     * @param localRouter local router system id
+     * @param neighborId  destination router system id
+     * @return linkInformation instance
+     */
+    private LinkInformation createLinkInformation(LsPdu lsPdu, String linkId, String localRouter, String neighborId) {
+        LinkInformation linkInformation = new DefaultIsisLinkInformation();
+        IsisRouter isisRouter = isisRouterDetails.get(neighborId);
+        for (IsisTlv isisTlv : lsPdu.tlvs()) {
+            if (isisTlv instanceof IsExtendedReachability) {
+                IsExtendedReachability isExtendedReachability = (IsExtendedReachability) isisTlv;
+                List<NeighborForExtendedIs> neighbours = isExtendedReachability.neighbours();
+                for (NeighborForExtendedIs teTlv : neighbours) {
+                    List<TrafficEngineeringSubTlv> teSubTlvs = teTlv.teSubTlv();
+                    for (TrafficEngineeringSubTlv teSubTlv : teSubTlvs) {
+                        if (teSubTlv instanceof InterfaceIpAddress) {
+                            InterfaceIpAddress localIpAddress = (InterfaceIpAddress) teSubTlv;
+                            linkInformation.setInterfaceIp(localIpAddress.localInterfaceIPAddress());
+                        } else if (teSubTlv instanceof NeighborIpAddress) {
+                            NeighborIpAddress neighborIpAddress = (NeighborIpAddress) teSubTlv;
+                            linkInformation.setNeighborIp(neighborIpAddress.neighborIPAddress());
+                        }
+
+                    }
+                }
+            }
+        }
+        linkInformation.setLinkId(linkId);
+        linkInformation.setAlreadyCreated(false);
+        linkInformation.setLinkDestinationId(neighborId);
+        linkInformation.setLinkSourceId(localRouter);
+        return linkInformation;
+    }
+
+    /**
+     * Creates ISIS router instance.
+     *
+     * @param lsPdu lsp instance
+     * @return isisRouter instance
+     */
+    private IsisRouter createIsisRouter(LsPdu lsPdu) {
+        IsisRouter isisRouter = new DefaultIsisRouter();
+        if (IsisUtil.checkIsDis(lsPdu.lspId())) {
+            isisRouter.setDis(true);
+        } else {
+            isisRouter.setDis(false);
+        }
+        isisRouter.setSystemId(IsisUtil.removeTailingZeros(lsPdu.lspId()));
+        for (IsisTlv isisTlv : lsPdu.tlvs()) {
+            if (isisTlv instanceof IsExtendedReachability) {
+                IsExtendedReachability isExtendedReachability = (IsExtendedReachability) isisTlv;
+                List<NeighborForExtendedIs> neighbours = isExtendedReachability.neighbours();
+                for (NeighborForExtendedIs teTlv : neighbours) {
+                    List<TrafficEngineeringSubTlv> teSubTlvs = teTlv.teSubTlv();
+                    for (TrafficEngineeringSubTlv teSubTlv : teSubTlvs) {
+                        if (teSubTlv instanceof InterfaceIpAddress) {
+                            InterfaceIpAddress localIpAddress = (InterfaceIpAddress) teSubTlv;
+                            isisRouter.setInterfaceId(localIpAddress.localInterfaceIPAddress());
+                        } else if (teSubTlv instanceof NeighborIpAddress) {
+                            NeighborIpAddress neighborIpAddress = (NeighborIpAddress) teSubTlv;
+                            isisRouter.setNeighborRouterId(neighborIpAddress.neighborIPAddress());
+                        }
+
+                    }
+                }
+            }
+        }
+        return isisRouter;
+    }
+
+    /**
+     * Creates ISIS router instance.
+     *
+     * @param systemId system ID
+     * @return isisRouter instance
+     */
+    private IsisRouter createIsisRouterDummy(String systemId) {
+        IsisRouter isisRouter = new DefaultIsisRouter();
+        isisRouter.setSystemId(systemId);
+        isisRouter.setDis(false);
+        isisRouter.setInterfaceId(IsisConstants.DEFAULTIP);
+        isisRouter.setNeighborRouterId(IsisConstants.DEFAULTIP);
+
+        return isisRouter;
+    }
+
+    /**
+     * Creates the ISIS link TED information.
+     *
+     * @param lsPdu link state PDU
+     * @return isisLinkTed
+     */
+    public IsisLinkTed createIsisLinkTedInfo(LsPdu lsPdu) {
+        IsisLinkTed isisLinkTed = new DefaultIsisLinkTed();
+        for (IsisTlv isisTlv : lsPdu.tlvs()) {
+            if (isisTlv instanceof IsExtendedReachability) {
+                IsExtendedReachability isExtendedReachability = (IsExtendedReachability) isisTlv;
+                List<NeighborForExtendedIs> neighbours = isExtendedReachability.neighbours();
+                for (NeighborForExtendedIs teTlv : neighbours) {
+                    List<TrafficEngineeringSubTlv> teSubTlvs = teTlv.teSubTlv();
+                    for (TrafficEngineeringSubTlv teSubTlv : teSubTlvs) {
+                        if (teSubTlv instanceof AdministrativeGroup) {
+                            AdministrativeGroup ag = (AdministrativeGroup) teSubTlv;
+                            isisLinkTed.setAdministrativeGroup(ag.administrativeGroup());
+                        }
+                        if (teSubTlv instanceof InterfaceIpAddress) {
+                            InterfaceIpAddress localIpAddress = (InterfaceIpAddress) teSubTlv;
+                            isisLinkTed.setIpv4InterfaceAddress(localIpAddress.localInterfaceIPAddress());
+                        }
+                        if (teSubTlv instanceof NeighborIpAddress) {
+                            NeighborIpAddress neighborIpAddress = (NeighborIpAddress) teSubTlv;
+                            isisLinkTed.setIpv4NeighborAddress(neighborIpAddress.neighborIPAddress());
+                        }
+                        if (teSubTlv instanceof TrafficEngineeringMetric) {
+                            TrafficEngineeringMetric teM = (TrafficEngineeringMetric) teSubTlv;
+                            isisLinkTed.setTeDefaultMetric(teM.getTrafficEngineeringMetricValue());
+                        }
+                        if (teSubTlv instanceof MaximumBandwidth) {
+                            MaximumBandwidth maxLinkBandwidth = (MaximumBandwidth) teSubTlv;
+                            isisLinkTed.setMaximumLinkBandwidth(
+                                    Bandwidth.bps(maxLinkBandwidth.getMaximumBandwidthValue()));
+                        }
+                        if (teSubTlv instanceof MaximumReservableBandwidth) {
+                            MaximumReservableBandwidth maxReservableBw = (MaximumReservableBandwidth) teSubTlv;
+                            isisLinkTed.setMaximumReservableLinkBandwidth(
+                                    Bandwidth.bps(maxReservableBw.getMaximumBandwidthValue()));
+                        }
+                        if (teSubTlv instanceof UnreservedBandwidth) {
+                            UnreservedBandwidth unReservedBandwidth = (UnreservedBandwidth) teSubTlv;
+                            List<Bandwidth> bandwidthList = new ArrayList<>();
+                            List<Float> unReservedBandwidthList = unReservedBandwidth.unReservedBandwidthValue();
+                            for (Float unReservedBandwidthFloatValue : unReservedBandwidthList) {
+                                Bandwidth bandwidth = Bandwidth.bps(unReservedBandwidthFloatValue);
+                                bandwidthList.add(bandwidth);
+                            }
+                            isisLinkTed.setUnreservedBandwidth(bandwidthList);
+                        }
+                    }
+                }
+            }
+        }
+        return isisLinkTed;
+    }
+}
\ No newline at end of file
diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/package-info.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/package-info.java
new file mode 100644
index 0000000..f9b4c0c
--- /dev/null
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/topology/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * 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.
+ */
+
+/**
+ * Implementation of the ISIS controller topology.
+ */
+package org.onosproject.isis.controller.impl.topology;
\ No newline at end of file