diff --git a/cli/src/main/java/org/onosproject/cli/Comparators.java b/cli/src/main/java/org/onosproject/cli/Comparators.java
index b0cbbdd..1df2f04 100644
--- a/cli/src/main/java/org/onosproject/cli/Comparators.java
+++ b/cli/src/main/java/org/onosproject/cli/Comparators.java
@@ -25,6 +25,8 @@
 import org.onosproject.net.Port;
 import org.onosproject.net.flow.FlowRule;
 import org.onosproject.net.group.Group;
+
+import org.onosproject.net.statistic.TypedFlowEntryWithLoad;
 import org.onosproject.net.topology.TopologyCluster;
 
 import java.util.Comparator;
@@ -115,4 +117,12 @@
     public static final Comparator<Interface> INTERFACES_COMPARATOR = (intf1, intf2) ->
             CONNECT_POINT_COMPARATOR.compare(intf1.connectPoint(), intf2.connectPoint());
 
+    public static final Comparator<TypedFlowEntryWithLoad> TYPEFLOWENTRY_WITHLOAD_COMPARATOR =
+            new Comparator<TypedFlowEntryWithLoad>() {
+                @Override
+                public int compare(TypedFlowEntryWithLoad fe1, TypedFlowEntryWithLoad fe2) {
+                    long delta = fe1.load().rate() -  fe2.load().rate();
+                    return delta == 0 ? 0 : (delta > 0 ? -1 : +1);
+                }
+            };
 }
diff --git a/cli/src/main/java/org/onosproject/cli/net/GetFlowStatistics.java b/cli/src/main/java/org/onosproject/cli/net/GetFlowStatistics.java
new file mode 100644
index 0000000..cafe87f
--- /dev/null
+++ b/cli/src/main/java/org/onosproject/cli/net/GetFlowStatistics.java
@@ -0,0 +1,323 @@
+/*
+ * 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.cli.net;
+
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.commands.Option;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.flow.TypedStoredFlowEntry;
+import org.onosproject.net.flow.instructions.Instruction;
+import org.onosproject.net.statistic.FlowStatisticService;
+import org.onosproject.net.statistic.SummaryFlowEntryWithLoad;
+import org.onosproject.net.statistic.TypedFlowEntryWithLoad;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.onosproject.net.DeviceId.deviceId;
+import static org.onosproject.net.PortNumber.portNumber;
+
+/**
+ * Fetches flow statistics with a flow type and instruction type.
+ */
+@Command(scope = "onos", name = "get-flow-stats",
+        description = "Fetches flow stats for a connection point with given flow type and instruction type")
+public class GetFlowStatistics extends AbstractShellCommand {
+    @Argument(index = 0, name = "devicePort",
+            description = "Device[/Port] connectPoint Description",
+            required = true, multiValued = false)
+    String devicePort = null;
+
+    @Option(name = "-s", aliases = "--summary",
+            description = "Show flow stats summary",
+            required = false, multiValued = false)
+    boolean showSummary = true; // default summary
+
+    @Option(name = "-a", aliases = "--all",
+            description = "Show flow stats all",
+            required = false, multiValued = false)
+    boolean showAll = false;
+
+    @Option(name = "-t", aliases = "--topn",
+            description = "Show flow stats topn",
+            required = false, multiValued = false)
+    String showTopn = null;
+
+    @Option(name = "-f", aliases = "--flowType",
+            description = "Flow live type, It includes IMMEDIATE, SHORT, MID, LONG, UNKNOWN"
+                          + ", and is valid with -a or -t option only",
+            required = false, multiValued = false)
+    String flowLiveType = null;
+
+    @Option(name = "-i", aliases = "--instructionType",
+            description = "Flow instruction type, It includes DROP, OUTPUT, GROUP, L0MODIFICATION, L2MODIFICATION,"
+                    + " TABLE, L3MODIFICATION, METADATA"
+                    + ", and is valid with -a or -t option only",
+            required = false, multiValued = false)
+    String instructionType = null;
+
+    @Override
+    protected void execute() {
+        DeviceService deviceService = get(DeviceService.class);
+        FlowStatisticService flowStatsService = get(FlowStatisticService.class);
+
+        String deviceURI = getDeviceId(devicePort);
+        String portURI = getPortNumber(devicePort);
+
+        DeviceId ingressDeviceId = deviceId(deviceURI);
+        PortNumber ingressPortNumber;
+        if (portURI.length() == 0) {
+            ingressPortNumber = null;
+        } else {
+            ingressPortNumber = portNumber(portURI);
+        }
+
+        Device device = deviceService.getDevice(ingressDeviceId);
+        if (device == null) {
+            error("No such device %s", ingressDeviceId.uri());
+            return;
+        }
+
+        if (ingressPortNumber != null) {
+            Port port = deviceService.getPort(ingressDeviceId, ingressPortNumber);
+            if (port == null) {
+                error("No such port %s on device %s", portURI, ingressDeviceId.uri());
+                return;
+            }
+        }
+
+        if (flowLiveType != null) {
+            flowLiveType = flowLiveType.toUpperCase();
+        }
+        if (instructionType != null) {
+            instructionType = instructionType.toUpperCase();
+        }
+
+        // convert String to FlowLiveType and check validity
+        TypedStoredFlowEntry.FlowLiveType inLiveType;
+        if (flowLiveType == null) {
+            inLiveType = null;
+        } else {
+            inLiveType = getFlowLiveType(flowLiveType);
+            if (inLiveType == null) {
+                error("Invalid flow live type [%s] error", flowLiveType);
+                return;
+            }
+        }
+        // convert String to InstructionType and check validity
+        Instruction.Type inInstructionType;
+        if (instructionType == null) {
+            inInstructionType = null;
+        } else {
+            inInstructionType = getInstructionType(instructionType);
+            if (inInstructionType == null) {
+                error("Invalid instruction type [%s] error", instructionType);
+                return;
+            }
+        }
+
+        if (showTopn != null) {
+            int topn = Integer.parseInt(showTopn);
+
+            if (topn <= 0) {
+                topn = 100; //default value
+            } else if (topn > 1000) {
+                topn = 1000; //max value
+            }
+
+            // print show topn head line with type
+            print("deviceId=%s, show TOPN=%s flows, live type=%s, instruction type=%s",
+                    deviceURI,
+                    Integer.toString(topn),
+                    flowLiveType == null ? "ALL" : flowLiveType,
+                    instructionType == null ? "ALL" : instructionType);
+            if (ingressPortNumber == null) {
+                Map<ConnectPoint, List<TypedFlowEntryWithLoad>> typedFlowLoadMap =
+                          flowStatsService.loadTopnByType(device, inLiveType, inInstructionType, topn);
+                // print all ports topn flows load for a given device
+                for (ConnectPoint cp : typedFlowLoadMap.keySet()) {
+                    printPortFlowsLoad(cp, typedFlowLoadMap.get(cp));
+                }
+            } else {
+                List<TypedFlowEntryWithLoad> typedFlowLoad =
+                        flowStatsService.loadTopnByType(device, ingressPortNumber, inLiveType, inInstructionType, topn);
+                // print device/port topn flows load
+                ConnectPoint cp = new ConnectPoint(ingressDeviceId, ingressPortNumber);
+                printPortFlowsLoad(cp, typedFlowLoad);
+            }
+        } else if (showAll) { // is true?
+            // print show all head line with type
+            print("deviceId=%s, show ALL flows, live type=%s, instruction type=%s",
+                    deviceURI,
+                    flowLiveType == null ? "ALL" : flowLiveType,
+                    instructionType == null ? "ALL" : instructionType);
+            if (ingressPortNumber == null) {
+                Map<ConnectPoint, List<TypedFlowEntryWithLoad>> typedFlowLoadMap =
+                        flowStatsService.loadAllByType(device, inLiveType, inInstructionType);
+                // print all ports all flows load for a given device
+                for (ConnectPoint cp : typedFlowLoadMap.keySet()) {
+                    printPortFlowsLoad(cp, typedFlowLoadMap.get(cp));
+                }
+            } else {
+                List<TypedFlowEntryWithLoad> typedFlowLoad =
+                        flowStatsService.loadAllByType(device, ingressPortNumber, inLiveType, inInstructionType);
+                // print device/port all flows load
+                ConnectPoint cp = new ConnectPoint(ingressDeviceId, ingressPortNumber);
+                printPortFlowsLoad(cp, typedFlowLoad);
+            }
+        } else { // if (showSummary == true) //always is true
+            // print show summary head line
+            print("deviceId=%s, show SUMMARY flows", deviceURI);
+            if (ingressPortNumber == null) {
+                Map<ConnectPoint, SummaryFlowEntryWithLoad> summaryFlowLoadMap =
+                        flowStatsService.loadSummary(device);
+                // print all ports flow load summary for a given device
+                for (ConnectPoint cp : summaryFlowLoadMap.keySet()) {
+                    printPortSummaryLoad(cp, summaryFlowLoadMap.get(cp));
+                }
+            } else {
+                SummaryFlowEntryWithLoad summaryFlowLoad =
+                        flowStatsService.loadSummary(device, ingressPortNumber);
+                // print device/port flow load summary
+                ConnectPoint cp = new ConnectPoint(ingressDeviceId, ingressPortNumber);
+                printPortSummaryLoad(cp, summaryFlowLoad);
+            }
+        }
+    }
+
+    /**
+     * Extracts the port number portion of the ConnectPoint.
+     *
+     * @param deviceString string representing the device/port
+     * @return port number as a string, empty string if the port is not found
+     */
+    private String getPortNumber(String deviceString) {
+        if (deviceString == null) {
+            return "";
+        }
+
+        int slash = deviceString.indexOf('/');
+        if (slash <= 0) {
+            return ""; // return when no port number
+        }
+        return deviceString.substring(slash + 1, deviceString.length());
+    }
+
+    /**
+     * Extracts the device ID portion of the ConnectPoint.
+     *
+     * @param deviceString string representing the device/port
+     * @return device ID string
+     */
+    private String getDeviceId(String deviceString) {
+        if (deviceString == null) {
+            return "";
+        }
+
+        int slash = deviceString.indexOf('/');
+        if (slash <= 0) {
+            return deviceString; // return only included device ID
+        }
+        return deviceString.substring(0, slash);
+    }
+
+    /**
+     * converts string of flow live type to FloeLiveType enum.
+     *
+     * @param liveType string representing the flow live type
+     * @return TypedStoredFlowEntry.FlowLiveType
+     */
+    private TypedStoredFlowEntry.FlowLiveType getFlowLiveType(String liveType) {
+        String liveTypeUC = liveType.toUpperCase();
+
+        if (liveTypeUC.equals("IMMEDIATE")) {
+            return TypedStoredFlowEntry.FlowLiveType.IMMEDIATE_FLOW;
+        } else if (liveTypeUC.equals("SHORT")) {
+            return TypedStoredFlowEntry.FlowLiveType.SHORT_FLOW;
+        } else if (liveTypeUC.equals("MID")) {
+            return TypedStoredFlowEntry.FlowLiveType.MID_FLOW;
+        } else if (liveTypeUC.equals("LONG")) {
+            return TypedStoredFlowEntry.FlowLiveType.LONG_FLOW;
+        } else if (liveTypeUC.equals("UNKNOWN")) {
+            return TypedStoredFlowEntry.FlowLiveType.UNKNOWN_FLOW;
+        } else {
+            return null; // flow live type error
+        }
+    }
+
+    /**
+     * converts string of instruction type to Instruction type enum.
+     *
+     * @param instType string representing the instruction type
+     * @return Instruction.Type
+     */
+    private Instruction.Type getInstructionType(String instType) {
+        String instTypeUC = instType.toUpperCase();
+
+        if (instTypeUC.equals("DROP")) {
+            return Instruction.Type.DROP;
+        } else if (instTypeUC.equals("OUTPUT")) {
+            return Instruction.Type.OUTPUT;
+        } else if (instTypeUC.equals("GROUP")) {
+            return Instruction.Type.GROUP;
+        } else if (instTypeUC.equals("L0MODIFICATION")) {
+            return Instruction.Type.L0MODIFICATION;
+        } else if (instTypeUC.equals("L2MODIFICATION")) {
+            return Instruction.Type.L2MODIFICATION;
+        } else if (instTypeUC.equals("TABLE")) {
+            return Instruction.Type.TABLE;
+        } else if (instTypeUC.equals("L3MODIFICATION")) {
+            return Instruction.Type.L3MODIFICATION;
+        } else if (instTypeUC.equals("METADATA")) {
+            return Instruction.Type.METADATA;
+        } else {
+             return null; // instruction type error
+        }
+    }
+
+    private void printPortFlowsLoad(ConnectPoint cp, List<TypedFlowEntryWithLoad> typedFlowLoad) {
+       print("  deviceId/Port=%s/%s, %s flows", cp.elementId(), cp.port(), typedFlowLoad.size());
+        for (TypedFlowEntryWithLoad tfel: typedFlowLoad) {
+            TypedStoredFlowEntry tfe =  tfel.typedStoredFlowEntry();
+            print("    flowId=%s, state=%s, liveType=%s, life=%s -> %s",
+                    Long.toHexString(tfe.id().value()),
+                    tfe.state(),
+                    tfe.flowLiveType(),
+                    tfe.life(),
+                    tfel.load().isValid() ? tfel.load() : "Load{rate=0, NOT VALID}");
+        }
+    }
+
+    private void printPortSummaryLoad(ConnectPoint cp, SummaryFlowEntryWithLoad summaryFlowLoad) {
+        print("  deviceId/Port=%s/%s, Total=%s, Immediate=%s, Short=%s, Mid=%s, Long=%s, Unknown=%s",
+                cp.elementId(),
+                cp.port(),
+                summaryFlowLoad.totalLoad().isValid() ? summaryFlowLoad.totalLoad() : "Load{rate=0, NOT VALID}",
+                summaryFlowLoad.immediateLoad().isValid() ? summaryFlowLoad.immediateLoad() : "Load{rate=0, NOT VALID}",
+                summaryFlowLoad.shortLoad().isValid() ? summaryFlowLoad.shortLoad() : "Load{rate=0, NOT VALID}",
+                summaryFlowLoad.midLoad().isValid() ? summaryFlowLoad.midLoad() : "Load{rate=0, NOT VALID}",
+                summaryFlowLoad.longLoad().isValid() ? summaryFlowLoad.longLoad() : "Load{rate=0, NOT VALID}",
+                summaryFlowLoad.unknownLoad().isValid() ? summaryFlowLoad.unknownLoad() : "Load{rate=0, NOT VALID}");
+    }
+}
diff --git a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
index 459ffa9..8c56a49 100644
--- a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
+++ b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -222,6 +222,12 @@
             </completers>
         </command>
         <command>
+            <action class="org.onosproject.cli.net.GetFlowStatistics"/>
+            <completers>
+                <ref component-id="deviceIdCompleter"/>
+            </completers>
+        </command>
+        <command>
             <action class="org.onosproject.cli.net.AddMultiPointToSinglePointIntentCommand"/>
             <completers>
                 <ref component-id="connectPointCompleter"/>
@@ -333,7 +339,6 @@
         <command>
             <action class="org.onosproject.cli.net.InterfacesListCommand"/>
         </command>
-
         <command>
             <action class="org.onosproject.cli.net.GroupsListCommand"/>
         </command>
diff --git a/core/api/src/main/java/org/onosproject/net/statistic/FlowStatisticService.java b/core/api/src/main/java/org/onosproject/net/statistic/FlowStatisticService.java
new file mode 100644
index 0000000..f59670b
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/statistic/FlowStatisticService.java
@@ -0,0 +1,105 @@
+/*
+ * 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.net.statistic;
+
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.Device;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.flow.TypedStoredFlowEntry;
+import org.onosproject.net.flow.instructions.Instruction;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Service for obtaining individual flow statistic information about device and link in the system.
+ * Basic statistics are obtained from the StatisticService
+ */
+public interface FlowStatisticService {
+
+    /**
+     * Obtain the summary load list for the device with the given link.
+     *
+     * @param device the Device  to query.
+     * @return map of summary flow entry load
+     */
+    Map<ConnectPoint, SummaryFlowEntryWithLoad> loadSummary(Device device);
+
+    /**
+     * Obtain the summary load for the device with the given link or port.
+     *
+     * @param device the Device to query.
+     * @param pNumber the port number to query.
+     * @return summary flow entry load
+     */
+    SummaryFlowEntryWithLoad loadSummary(Device device, PortNumber pNumber);
+
+    /**
+     * Obtain the set of the flow type and load list for the device with the given link.
+     *
+     * @param device the Device  to query.
+     * @param liveType the FlowLiveType  to filter, null means no filtering .
+     * @param instType the InstructionType to filter, null means no filtering.
+     * @return map of flow entry load
+     */
+    Map<ConnectPoint, List<TypedFlowEntryWithLoad>> loadAllByType(Device device,
+                                                                  TypedStoredFlowEntry.FlowLiveType liveType,
+                                                                  Instruction.Type instType);
+
+    /**
+     * Obtain the flow type and load list for the device with the given link or port.
+     *
+     * @param device the Device to query.
+     * @param pNumber the port number of the Device to query
+     * @param liveType the FlowLiveType  to filter, null means no filtering .
+     * @param instType the InstructionType to filter, null means no filtering.
+     * @return list of flow entry load
+     */
+    List<TypedFlowEntryWithLoad> loadAllByType(Device device, PortNumber pNumber,
+                                               TypedStoredFlowEntry.FlowLiveType liveType,
+                                               Instruction.Type instType);
+
+    /**
+     * Obtain the set of the flow type and load topn list for the device with the given link.
+     *
+     * @param device the Device  to query.
+     * @param liveType the FlowLiveType  to filter, null means no filtering .
+     * @param instType the InstructionType to filter, null means no filtering.
+     * @param topn the top number to filter, null means no filtering.
+     * @return map of flow entry load
+     */
+    Map<ConnectPoint, List<TypedFlowEntryWithLoad>> loadTopnByType(Device device,
+                                                                   TypedStoredFlowEntry.FlowLiveType liveType,
+                                                                   Instruction.Type instType,
+                                                                   int topn);
+
+    /**
+     * Obtain the flow type and load topn list for the device with the given link or port.
+     *
+     * @param device the Device  to query.
+     * @param pNumber the port number of the Device to query
+     * @param liveType the FlowLiveType  to filter, null means no filtering .
+     * @param instType the InstructionType to filter, null means no filtering.
+     * @return list of flow entry load
+     */
+    List<TypedFlowEntryWithLoad> loadTopnByType(Device device, PortNumber pNumber,
+                                                TypedStoredFlowEntry.FlowLiveType liveType,
+                                                Instruction.Type instType,
+                                                int topn);
+}
+
+
diff --git a/core/api/src/main/java/org/onosproject/net/statistic/FlowStatisticStore.java b/core/api/src/main/java/org/onosproject/net/statistic/FlowStatisticStore.java
new file mode 100644
index 0000000..3c2aa89
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/statistic/FlowStatisticStore.java
@@ -0,0 +1,65 @@
+/*
+ * 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.net.statistic;
+
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.flow.FlowEntry;
+import org.onosproject.net.flow.FlowRule;
+
+import java.util.Set;
+
+/**
+ * Flow Store to house the computed statistics.
+ */
+public interface FlowStatisticStore {
+    /**
+     * Remove entries associated with this rule.
+     *
+     * @param rule {@link org.onosproject.net.flow.FlowRule}
+     */
+    void removeFlowStatistic(FlowRule rule);
+
+    /**
+     * Adds a flow stats observation for a flow rule. The previous flow will be removed.
+     *
+     * @param rule a {@link org.onosproject.net.flow.FlowEntry}
+     */
+    void addFlowStatistic(FlowEntry rule);
+
+    /**
+     * Updates a stats observation for a flow rule. The old flow stats will be moved to previous stats.
+     *
+     * @param rule a {@link org.onosproject.net.flow.FlowEntry}
+     */
+    void updateFlowStatistic(FlowEntry rule);
+
+    /**
+     * Fetches the current observed flow stats values.
+     *
+     * @param connectPoint the port to fetch information for
+     * @return set of current flow rules
+     */
+    Set<FlowEntry> getCurrentFlowStatistic(ConnectPoint connectPoint);
+
+    /**
+     * Fetches the current observed flow stats values.
+     *
+     * @param connectPoint the port to fetch information for
+     * @return set of current values
+     */
+    Set<FlowEntry> getPreviousFlowStatistic(ConnectPoint connectPoint);
+}
diff --git a/core/api/src/main/java/org/onosproject/net/statistic/SummaryFlowEntryWithLoad.java b/core/api/src/main/java/org/onosproject/net/statistic/SummaryFlowEntryWithLoad.java
new file mode 100644
index 0000000..60da636
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/statistic/SummaryFlowEntryWithLoad.java
@@ -0,0 +1,143 @@
+/*
+ * 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.net.statistic;
+
+import org.onosproject.net.ConnectPoint;
+
+/**
+ * Summary Load classified by flow live type.
+ */
+public class SummaryFlowEntryWithLoad {
+    private ConnectPoint cp;
+    private Load totalLoad;
+    private Load immediateLoad;
+    private Load shortLoad;
+    private Load midLoad;
+    private Load longLoad;
+    private Load unknownLoad;
+
+    /**
+     * Creates a new summary flow entry having load for the given connect point and total load.
+     *
+     * @param cp        connect point
+     * @param totalLoad total load
+     */
+    public SummaryFlowEntryWithLoad(ConnectPoint cp, Load totalLoad) {
+        this.cp = cp;
+        this.totalLoad = totalLoad;
+        this.immediateLoad = new DefaultLoad();
+        this.shortLoad = new DefaultLoad();
+        this.midLoad = new DefaultLoad();
+        this.longLoad = new DefaultLoad();
+        this.unknownLoad = new DefaultLoad();
+    }
+
+    /**
+     * Creates a new summary flow entry having load for the given connect point
+     * and total, immediate, short, mid, and long load.
+     *
+     * @param cp        connect point
+     * @param totalLoad total load
+     * @param immediateLoad immediate load
+     * @param shortLoad short load
+     * @param midLoad mid load
+     * @param longLoad long load
+     */
+    public SummaryFlowEntryWithLoad(ConnectPoint cp,
+                                    Load totalLoad, Load immediateLoad, Load shortLoad, Load midLoad, Load longLoad) {
+        this.cp = cp;
+        this.totalLoad = totalLoad;
+        this.immediateLoad = immediateLoad;
+        this.shortLoad = shortLoad;
+        this.midLoad = midLoad;
+        this.longLoad = longLoad;
+        this.unknownLoad = new DefaultLoad();
+    }
+
+    /**
+     * Creates a new summary flow entry having load for the given connect point
+     * and total, immediate, short, mid, long, and unknown load.
+     *
+     * @param cp        connect point
+     * @param totalLoad total load
+     * @param immediateLoad immediate load
+     * @param shortLoad short load
+     * @param midLoad mid load
+     * @param longLoad long load
+     * @param unknownLoad long load
+     */
+    public SummaryFlowEntryWithLoad(ConnectPoint cp,
+                                    Load totalLoad, Load immediateLoad,
+                                    Load shortLoad, Load midLoad, Load longLoad, Load unknownLoad) {
+        this.cp = cp;
+        this.totalLoad = totalLoad;
+        this.immediateLoad = immediateLoad;
+        this.shortLoad = shortLoad;
+        this.midLoad = midLoad;
+        this.longLoad = longLoad;
+        this.unknownLoad = unknownLoad;
+    }
+
+    /**
+     * Returns connect point.
+     */
+    public ConnectPoint connectPoint() {
+        return cp;
+    }
+
+    /**
+     * Returns total load of connect point.
+     */
+    public Load totalLoad() {
+        return totalLoad;
+    }
+
+    /**
+     * Returns immediate load of connect point.
+     */
+    public Load immediateLoad() {
+        return immediateLoad;
+    }
+
+    /**
+     * Returns short load of connect point.
+     */
+    public Load shortLoad() {
+        return shortLoad;
+    }
+
+    /**
+     * Returns mid load of connect point.
+     */
+    public Load midLoad() {
+        return midLoad;
+    }
+
+    /**
+     * Returns long load of connect point.
+     */
+    public Load longLoad() {
+        return longLoad;
+    }
+
+    /**
+     * Returns unknown load of connect point.
+     */
+    public Load unknownLoad() {
+        return unknownLoad;
+    }
+}
diff --git a/core/api/src/main/java/org/onosproject/net/statistic/TypedFlowEntryWithLoad.java b/core/api/src/main/java/org/onosproject/net/statistic/TypedFlowEntryWithLoad.java
new file mode 100644
index 0000000..3e2dbdf
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/statistic/TypedFlowEntryWithLoad.java
@@ -0,0 +1,143 @@
+/*
+ * 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.net.statistic;
+
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.flow.FlowEntry;
+import org.onosproject.net.flow.TypedStoredFlowEntry;
+import org.onosproject.net.flow.DefaultTypedFlowEntry;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Load of flow entry of flow live type.
+ */
+public class TypedFlowEntryWithLoad {
+    private ConnectPoint cp;
+    private TypedStoredFlowEntry tfe;
+    private Load load;
+
+    //TODO: make this variables class, and share with NewAdaptivceFlowStatsCollector class
+    private static final int CAL_AND_POLL_INTERVAL = 5; // means SHORT_POLL_INTERVAL
+    private static final int MID_POLL_INTERVAL = 10;
+    private static final int LONG_POLL_INTERVAL = 15;
+
+
+    public TypedFlowEntryWithLoad(ConnectPoint cp, TypedStoredFlowEntry tfe, Load load) {
+        this.cp = cp;
+        this.tfe = tfe;
+        this.load = load;
+    }
+
+    public TypedFlowEntryWithLoad(ConnectPoint cp, TypedStoredFlowEntry tfe) {
+        this.cp = cp;
+        this.tfe = tfe;
+        this.load = new DefaultLoad(tfe.bytes(), 0, typedPollInterval(tfe));
+    }
+
+    public TypedFlowEntryWithLoad(ConnectPoint cp, FlowEntry fe) {
+        this.cp = cp;
+        this.tfe = newTypedStoredFlowEntry(fe);
+        this.load = new DefaultLoad(fe.bytes(), 0, typedPollInterval(this.tfe));
+    }
+
+    public ConnectPoint connectPoint() {
+        return cp;
+    }
+    public TypedStoredFlowEntry typedStoredFlowEntry() {
+        return tfe;
+    }
+    public Load load() {
+        return load;
+    }
+    public void setLoad(Load load) {
+        this.load = load;
+    }
+
+    /**
+     * Returns short polling interval.
+     */
+    public static int shortPollInterval() {
+        return CAL_AND_POLL_INTERVAL;
+    }
+
+    /**
+     * Returns mid polling interval.
+     */
+    public static int midPollInterval() {
+        return MID_POLL_INTERVAL;
+    }
+
+    /**
+     * Returns long polling interval.
+     */
+    public static int longPollInterval() {
+        return LONG_POLL_INTERVAL;
+    }
+
+    /**
+     * Returns average polling interval.
+     */
+    public static int avgPollInterval() {
+        return (CAL_AND_POLL_INTERVAL + MID_POLL_INTERVAL + LONG_POLL_INTERVAL) / 3;
+    }
+
+    /**
+     * Returns current typed flow entry's polling interval.
+     *
+     * @param tfe typed flow entry
+     */
+    public static long typedPollInterval(TypedStoredFlowEntry tfe) {
+        checkNotNull(tfe, "TypedStoredFlowEntry cannot be null");
+
+        switch (tfe.flowLiveType()) {
+            case LONG_FLOW:
+                return LONG_POLL_INTERVAL;
+            case MID_FLOW:
+                return MID_POLL_INTERVAL;
+            case SHORT_FLOW:
+            case IMMEDIATE_FLOW:
+            default:
+                return CAL_AND_POLL_INTERVAL;
+        }
+    }
+
+    /**
+     * Creates a new typed flow entry with the given flow entry fe.
+     *
+     * @param fe flow entry
+     */
+    public static TypedStoredFlowEntry newTypedStoredFlowEntry(FlowEntry fe) {
+        if (fe == null) {
+            return null;
+        }
+
+        long life = fe.life();
+
+        if (life >= LONG_POLL_INTERVAL) {
+            return new DefaultTypedFlowEntry(fe, TypedStoredFlowEntry.FlowLiveType.LONG_FLOW);
+        } else if (life >= MID_POLL_INTERVAL) {
+            return new DefaultTypedFlowEntry(fe, TypedStoredFlowEntry.FlowLiveType.MID_FLOW);
+        } else if (life >= CAL_AND_POLL_INTERVAL) {
+            return new DefaultTypedFlowEntry(fe, TypedStoredFlowEntry.FlowLiveType.SHORT_FLOW);
+        } else if (life >= 0) {
+            return new DefaultTypedFlowEntry(fe, TypedStoredFlowEntry.FlowLiveType.IMMEDIATE_FLOW);
+        } else { // life < 0
+            return new DefaultTypedFlowEntry(fe, TypedStoredFlowEntry.FlowLiveType.UNKNOWN_FLOW);
+        }
+    }
+}
diff --git a/core/net/pom.xml b/core/net/pom.xml
index 9ea0007..c5d3126 100644
--- a/core/net/pom.xml
+++ b/core/net/pom.xml
@@ -52,6 +52,20 @@
 
         <dependency>
             <groupId>org.onosproject</groupId>
+            <version>${project.version}</version>
+            <artifactId>onos-cli</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-cli</artifactId>
+            <version>${project.version}</version>
+            <classifier>tests</classifier>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.onosproject</groupId>
             <artifactId>onos-core-common</artifactId>
             <version>${project.version}</version>
             <classifier>tests</classifier>
diff --git a/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java b/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java
new file mode 100644
index 0000000..6515ef3
--- /dev/null
+++ b/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java
@@ -0,0 +1,634 @@
+/*
+ * 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.net.statistic.impl;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Predicate;
+import com.google.common.collect.ImmutableSet;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.cli.Comparators;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.Device;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.flow.DefaultTypedFlowEntry;
+import org.onosproject.net.flow.FlowEntry;
+import org.onosproject.net.flow.FlowRule;
+import org.onosproject.net.flow.FlowRuleEvent;
+import org.onosproject.net.flow.FlowRuleListener;
+import org.onosproject.net.flow.FlowRuleService;
+import org.onosproject.net.flow.TypedStoredFlowEntry;
+import org.onosproject.net.flow.instructions.Instruction;
+import org.onosproject.net.statistic.DefaultLoad;
+import org.onosproject.net.statistic.FlowStatisticService;
+import org.onosproject.net.statistic.Load;
+import org.onosproject.net.statistic.FlowStatisticStore;
+import org.onosproject.net.statistic.SummaryFlowEntryWithLoad;
+import org.onosproject.net.statistic.TypedFlowEntryWithLoad;
+
+import org.slf4j.Logger;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.stream.Collectors;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onosproject.security.AppGuard.checkPermission;
+import static org.slf4j.LoggerFactory.getLogger;
+import static org.onosproject.security.AppPermission.Type.*;
+
+/**
+ * Provides an implementation of the Flow Statistic Service.
+ */
+@Component(immediate = true, enabled = true)
+@Service
+public class FlowStatisticManager implements FlowStatisticService {
+    private final Logger log = getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected FlowRuleService flowRuleService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected FlowStatisticStore flowStatisticStore;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DeviceService deviceService;
+
+    private final InternalFlowRuleStatsListener frListener = new InternalFlowRuleStatsListener();
+
+    @Activate
+    public void activate() {
+        flowRuleService.addListener(frListener);
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        flowRuleService.removeListener(frListener);
+        log.info("Stopped");
+    }
+
+    @Override
+    public Map<ConnectPoint, SummaryFlowEntryWithLoad> loadSummary(Device device) {
+        checkPermission(STATISTIC_READ);
+
+        Map<ConnectPoint, SummaryFlowEntryWithLoad> summaryLoad = new TreeMap<>(Comparators.CONNECT_POINT_COMPARATOR);
+
+        if (device == null) {
+            return summaryLoad;
+        }
+
+        List<Port> ports = new ArrayList<>(deviceService.getPorts(device.id()));
+
+        for (Port port : ports) {
+            ConnectPoint cp = new ConnectPoint(device.id(), port.number());
+            SummaryFlowEntryWithLoad sfe = loadSummaryPortInternal(cp);
+            summaryLoad.put(cp, sfe);
+        }
+
+        return summaryLoad;
+    }
+
+    @Override
+    public SummaryFlowEntryWithLoad loadSummary(Device device, PortNumber pNumber) {
+        checkPermission(STATISTIC_READ);
+
+        ConnectPoint cp = new ConnectPoint(device.id(), pNumber);
+        return loadSummaryPortInternal(cp);
+    }
+
+    @Override
+    public Map<ConnectPoint, List<TypedFlowEntryWithLoad>> loadAllByType(Device device,
+                                                                  TypedStoredFlowEntry.FlowLiveType liveType,
+                                                                  Instruction.Type instType) {
+        checkPermission(STATISTIC_READ);
+
+        Map<ConnectPoint, List<TypedFlowEntryWithLoad>> allLoad = new TreeMap<>(Comparators.CONNECT_POINT_COMPARATOR);
+
+        if (device == null) {
+            return allLoad;
+        }
+
+        List<Port> ports = new ArrayList<>(deviceService.getPorts(device.id()));
+
+        for (Port port : ports) {
+            ConnectPoint cp = new ConnectPoint(device.id(), port.number());
+            List<TypedFlowEntryWithLoad> tfel = loadAllPortInternal(cp, liveType, instType);
+            allLoad.put(cp, tfel);
+        }
+
+        return allLoad;
+    }
+
+    @Override
+    public List<TypedFlowEntryWithLoad> loadAllByType(Device device, PortNumber pNumber,
+                                               TypedStoredFlowEntry.FlowLiveType liveType,
+                                               Instruction.Type instType) {
+        checkPermission(STATISTIC_READ);
+
+        ConnectPoint cp = new ConnectPoint(device.id(), pNumber);
+        return loadAllPortInternal(cp, liveType, instType);
+    }
+
+    @Override
+    public Map<ConnectPoint, List<TypedFlowEntryWithLoad>> loadTopnByType(Device device,
+                                                                   TypedStoredFlowEntry.FlowLiveType liveType,
+                                                                   Instruction.Type instType,
+                                                                   int topn) {
+        checkPermission(STATISTIC_READ);
+
+        Map<ConnectPoint, List<TypedFlowEntryWithLoad>> allLoad = new TreeMap<>(Comparators.CONNECT_POINT_COMPARATOR);
+
+        if (device == null) {
+            return allLoad;
+        }
+
+        List<Port> ports = new ArrayList<>(deviceService.getPorts(device.id()));
+
+        for (Port port : ports) {
+            ConnectPoint cp = new ConnectPoint(device.id(), port.number());
+            List<TypedFlowEntryWithLoad> tfel = loadTopnPortInternal(cp, liveType, instType, topn);
+            allLoad.put(cp, tfel);
+        }
+
+        return allLoad;
+    }
+
+    @Override
+    public List<TypedFlowEntryWithLoad> loadTopnByType(Device device, PortNumber pNumber,
+                                                TypedStoredFlowEntry.FlowLiveType liveType,
+                                                Instruction.Type instType,
+                                                int topn) {
+        checkPermission(STATISTIC_READ);
+
+        ConnectPoint cp = new ConnectPoint(device.id(), pNumber);
+        return loadTopnPortInternal(cp, liveType, instType, topn);
+    }
+
+    private SummaryFlowEntryWithLoad loadSummaryPortInternal(ConnectPoint cp) {
+        checkPermission(STATISTIC_READ);
+
+        Set<FlowEntry> currentStats;
+        Set<FlowEntry> previousStats;
+
+        TypedStatistics typedStatistics;
+        synchronized (flowStatisticStore) {
+             currentStats = flowStatisticStore.getCurrentFlowStatistic(cp);
+            if (currentStats == null) {
+                return new SummaryFlowEntryWithLoad(cp, new DefaultLoad());
+            }
+            previousStats = flowStatisticStore.getPreviousFlowStatistic(cp);
+            if (previousStats == null) {
+                return new SummaryFlowEntryWithLoad(cp, new DefaultLoad());
+            }
+            // copy to local flow entry
+            typedStatistics = new TypedStatistics(currentStats, previousStats);
+
+            // Check for validity of this stats data
+            checkLoadValidity(currentStats, previousStats);
+        }
+
+        // current and previous set is not empty!
+        Set<FlowEntry> currentSet = typedStatistics.current();
+        Set<FlowEntry> previousSet = typedStatistics.previous();
+        Load totalLoad = new DefaultLoad(aggregateBytesSet(currentSet), aggregateBytesSet(previousSet),
+                TypedFlowEntryWithLoad.avgPollInterval());
+
+        Map<FlowRule, TypedStoredFlowEntry> currentMap;
+        Map<FlowRule, TypedStoredFlowEntry> previousMap;
+
+        currentMap = typedStatistics.currentImmediate();
+        previousMap = typedStatistics.previousImmediate();
+        Load immediateLoad = new DefaultLoad(aggregateBytesMap(currentMap), aggregateBytesMap(previousMap),
+                TypedFlowEntryWithLoad.shortPollInterval());
+
+        currentMap = typedStatistics.currentShort();
+        previousMap = typedStatistics.previousShort();
+        Load shortLoad = new DefaultLoad(aggregateBytesMap(currentMap), aggregateBytesMap(previousMap),
+                TypedFlowEntryWithLoad.shortPollInterval());
+
+        currentMap = typedStatistics.currentMid();
+        previousMap = typedStatistics.previousMid();
+        Load midLoad = new DefaultLoad(aggregateBytesMap(currentMap), aggregateBytesMap(previousMap),
+                TypedFlowEntryWithLoad.midPollInterval());
+
+        currentMap = typedStatistics.currentLong();
+        previousMap = typedStatistics.previousLong();
+        Load longLoad = new DefaultLoad(aggregateBytesMap(currentMap), aggregateBytesMap(previousMap),
+                TypedFlowEntryWithLoad.longPollInterval());
+
+        currentMap = typedStatistics.currentUnknown();
+        previousMap = typedStatistics.previousUnknown();
+        Load unknownLoad = new DefaultLoad(aggregateBytesMap(currentMap), aggregateBytesMap(previousMap),
+                TypedFlowEntryWithLoad.avgPollInterval());
+
+        return new SummaryFlowEntryWithLoad(cp, totalLoad, immediateLoad, shortLoad, midLoad, longLoad, unknownLoad);
+    }
+
+    private List<TypedFlowEntryWithLoad> loadAllPortInternal(ConnectPoint cp,
+                                                             TypedStoredFlowEntry.FlowLiveType liveType,
+                                                             Instruction.Type instType) {
+        checkPermission(STATISTIC_READ);
+
+        List<TypedFlowEntryWithLoad> retTFEL = new ArrayList<>();
+
+        Set<FlowEntry> currentStats;
+        Set<FlowEntry> previousStats;
+
+        TypedStatistics typedStatistics;
+        synchronized (flowStatisticStore) {
+            currentStats = flowStatisticStore.getCurrentFlowStatistic(cp);
+            if (currentStats == null) {
+                return retTFEL;
+            }
+            previousStats = flowStatisticStore.getPreviousFlowStatistic(cp);
+            if (previousStats == null) {
+                return retTFEL;
+            }
+            // copy to local flow entry set
+            typedStatistics = new TypedStatistics(currentStats, previousStats);
+
+            // Check for validity of this stats data
+            checkLoadValidity(currentStats, previousStats);
+        }
+
+        // current and previous set is not empty!
+        boolean isAllLiveType = (liveType == null ? true : false); // null is all live type
+        boolean isAllInstType = (instType == null ? true : false); // null is all inst type
+
+        Map<FlowRule, TypedStoredFlowEntry> currentMap;
+        Map<FlowRule, TypedStoredFlowEntry> previousMap;
+
+        if (isAllLiveType || liveType == TypedStoredFlowEntry.FlowLiveType.IMMEDIATE_FLOW) {
+            currentMap = typedStatistics.currentImmediate();
+            previousMap = typedStatistics.previousImmediate();
+
+            List<TypedFlowEntryWithLoad> fel = typedFlowEntryLoadByInstInternal(cp, currentMap, previousMap,
+                    isAllInstType, instType, TypedFlowEntryWithLoad.shortPollInterval());
+            if (fel.size() > 0) {
+                retTFEL.addAll(fel);
+            }
+        }
+
+        if (isAllLiveType || liveType == TypedStoredFlowEntry.FlowLiveType.SHORT_FLOW) {
+            currentMap = typedStatistics.currentShort();
+            previousMap = typedStatistics.previousShort();
+
+            List<TypedFlowEntryWithLoad> fel = typedFlowEntryLoadByInstInternal(cp, currentMap, previousMap,
+                    isAllInstType, instType, TypedFlowEntryWithLoad.shortPollInterval());
+            if (fel.size() > 0) {
+                retTFEL.addAll(fel);
+            }
+        }
+
+        if (isAllLiveType || liveType == TypedStoredFlowEntry.FlowLiveType.MID_FLOW) {
+            currentMap = typedStatistics.currentMid();
+            previousMap = typedStatistics.previousMid();
+
+            List<TypedFlowEntryWithLoad> fel = typedFlowEntryLoadByInstInternal(cp, currentMap, previousMap,
+                    isAllInstType, instType, TypedFlowEntryWithLoad.midPollInterval());
+            if (fel.size() > 0) {
+                retTFEL.addAll(fel);
+            }
+        }
+
+        if (isAllLiveType || liveType == TypedStoredFlowEntry.FlowLiveType.LONG_FLOW) {
+            currentMap = typedStatistics.currentLong();
+            previousMap = typedStatistics.previousLong();
+
+            List<TypedFlowEntryWithLoad> fel = typedFlowEntryLoadByInstInternal(cp, currentMap, previousMap,
+                    isAllInstType, instType, TypedFlowEntryWithLoad.longPollInterval());
+            if (fel.size() > 0) {
+                retTFEL.addAll(fel);
+            }
+        }
+
+        if (isAllLiveType || liveType == TypedStoredFlowEntry.FlowLiveType.UNKNOWN_FLOW) {
+            currentMap = typedStatistics.currentUnknown();
+            previousMap = typedStatistics.previousUnknown();
+
+            List<TypedFlowEntryWithLoad> fel = typedFlowEntryLoadByInstInternal(cp, currentMap, previousMap,
+                    isAllInstType, instType, TypedFlowEntryWithLoad.avgPollInterval());
+            if (fel.size() > 0) {
+                retTFEL.addAll(fel);
+            }
+        }
+
+        return retTFEL;
+    }
+
+    private List<TypedFlowEntryWithLoad> typedFlowEntryLoadByInstInternal(ConnectPoint cp,
+                                                                      Map<FlowRule, TypedStoredFlowEntry> currentMap,
+                                                                      Map<FlowRule, TypedStoredFlowEntry> previousMap,
+                                                                      boolean isAllInstType,
+                                                                      Instruction.Type instType,
+                                                                      int liveTypePollInterval) {
+        List<TypedFlowEntryWithLoad> fel = new ArrayList<>();
+
+        for (TypedStoredFlowEntry tfe : currentMap.values()) {
+            if (isAllInstType ||
+                    tfe.treatment().allInstructions().stream().
+                            filter(i -> i.type() == instType).
+                            findAny().isPresent()) {
+                long currentBytes = tfe.bytes();
+                long previousBytes = previousMap.getOrDefault(tfe, new DefaultTypedFlowEntry((FlowRule) tfe)).bytes();
+                Load fLoad = new DefaultLoad(currentBytes, previousBytes, liveTypePollInterval);
+                fel.add(new TypedFlowEntryWithLoad(cp, tfe, fLoad));
+            }
+        }
+
+        return fel;
+    }
+
+    private List<TypedFlowEntryWithLoad> loadTopnPortInternal(ConnectPoint cp,
+                                                             TypedStoredFlowEntry.FlowLiveType liveType,
+                                                             Instruction.Type instType,
+                                                             int topn) {
+        List<TypedFlowEntryWithLoad> fel = loadAllPortInternal(cp, liveType, instType);
+
+        // Sort with descending order of load
+        List<TypedFlowEntryWithLoad> tfel =
+                fel.stream().sorted(Comparators.TYPEFLOWENTRY_WITHLOAD_COMPARATOR).
+                        limit(topn).collect(Collectors.toList());
+
+        return tfel;
+    }
+
+    private long aggregateBytesSet(Set<FlowEntry> setFE) {
+        return setFE.stream().mapToLong(FlowEntry::bytes).sum();
+    }
+
+    private long aggregateBytesMap(Map<FlowRule, TypedStoredFlowEntry> mapFE) {
+        return mapFE.values().stream().mapToLong(FlowEntry::bytes).sum();
+    }
+
+    /**
+     * Internal data class holding two set of typed flow entries.
+     */
+    private static class TypedStatistics {
+        private final ImmutableSet<FlowEntry> currentAll;
+        private final ImmutableSet<FlowEntry> previousAll;
+
+        private final Map<FlowRule, TypedStoredFlowEntry> currentImmediate = new HashMap<>();
+        private final Map<FlowRule, TypedStoredFlowEntry> previousImmediate = new HashMap<>();
+
+        private final Map<FlowRule, TypedStoredFlowEntry> currentShort = new HashMap<>();
+        private final Map<FlowRule, TypedStoredFlowEntry> previousShort = new HashMap<>();
+
+        private final Map<FlowRule, TypedStoredFlowEntry> currentMid = new HashMap<>();
+        private final Map<FlowRule, TypedStoredFlowEntry> previousMid = new HashMap<>();
+
+        private final Map<FlowRule, TypedStoredFlowEntry> currentLong = new HashMap<>();
+        private final Map<FlowRule, TypedStoredFlowEntry> previousLong = new HashMap<>();
+
+        private final Map<FlowRule, TypedStoredFlowEntry> currentUnknown = new HashMap<>();
+        private final Map<FlowRule, TypedStoredFlowEntry> previousUnknown = new HashMap<>();
+
+        public TypedStatistics(Set<FlowEntry> current, Set<FlowEntry> previous) {
+            this.currentAll = ImmutableSet.copyOf(checkNotNull(current));
+            this.previousAll = ImmutableSet.copyOf(checkNotNull(previous));
+
+            currentAll.forEach(fe -> {
+                TypedStoredFlowEntry tfe = TypedFlowEntryWithLoad.newTypedStoredFlowEntry(fe);
+
+                switch (tfe.flowLiveType()) {
+                    case IMMEDIATE_FLOW:
+                        currentImmediate.put(fe, tfe);
+                        break;
+                    case SHORT_FLOW:
+                        currentShort.put(fe, tfe);
+                        break;
+                    case MID_FLOW:
+                        currentMid.put(fe, tfe);
+                        break;
+                    case LONG_FLOW:
+                        currentLong.put(fe, tfe);
+                        break;
+                    default:
+                        currentUnknown.put(fe, tfe);
+                        break;
+                }
+            });
+
+            previousAll.forEach(fe -> {
+                TypedStoredFlowEntry tfe = TypedFlowEntryWithLoad.newTypedStoredFlowEntry(fe);
+
+                switch (tfe.flowLiveType()) {
+                    case IMMEDIATE_FLOW:
+                        if (currentImmediate.containsKey(fe)) {
+                            previousImmediate.put(fe, tfe);
+                        } else if (currentShort.containsKey(fe)) {
+                            previousShort.put(fe, tfe);
+                        } else if (currentMid.containsKey(fe)) {
+                            previousMid.put(fe, tfe);
+                        } else if (currentLong.containsKey(fe)) {
+                            previousLong.put(fe, tfe);
+                        } else {
+                            previousUnknown.put(fe, tfe);
+                        }
+                        break;
+                    case SHORT_FLOW:
+                        if (currentShort.containsKey(fe)) {
+                            previousShort.put(fe, tfe);
+                        } else if (currentMid.containsKey(fe)) {
+                            previousMid.put(fe, tfe);
+                        } else if (currentLong.containsKey(fe)) {
+                            previousLong.put(fe, tfe);
+                        } else {
+                            previousUnknown.put(fe, tfe);
+                        }
+                        break;
+                    case MID_FLOW:
+                        if (currentMid.containsKey(fe)) {
+                            previousMid.put(fe, tfe);
+                        } else if (currentLong.containsKey(fe)) {
+                            previousLong.put(fe, tfe);
+                        } else {
+                            previousUnknown.put(fe, tfe);
+                        }
+                        break;
+                    case LONG_FLOW:
+                        if (currentLong.containsKey(fe)) {
+                            previousLong.put(fe, tfe);
+                        } else {
+                            previousUnknown.put(fe, tfe);
+                        }
+                        break;
+                    default:
+                        previousUnknown.put(fe, tfe);
+                        break;
+                }
+            });
+        }
+
+        /**
+         * Returns flow entries as the current value.
+         *
+         * @return flow entries as the current value
+         */
+        public ImmutableSet<FlowEntry> current() {
+            return currentAll;
+        }
+
+        /**
+         * Returns flow entries as the previous value.
+         *
+         * @return flow entries as the previous value
+         */
+        public ImmutableSet<FlowEntry> previous() {
+            return previousAll;
+        }
+
+        public Map<FlowRule, TypedStoredFlowEntry> currentImmediate() {
+            return currentImmediate;
+        }
+        public Map<FlowRule, TypedStoredFlowEntry> previousImmediate() {
+            return previousImmediate;
+        }
+        public Map<FlowRule, TypedStoredFlowEntry> currentShort() {
+            return currentShort;
+        }
+        public Map<FlowRule, TypedStoredFlowEntry> previousShort() {
+            return previousShort;
+        }
+        public Map<FlowRule, TypedStoredFlowEntry> currentMid() {
+            return currentMid;
+        }
+        public Map<FlowRule, TypedStoredFlowEntry> previousMid() {
+            return previousMid;
+        }
+        public Map<FlowRule, TypedStoredFlowEntry> currentLong() {
+            return currentLong;
+        }
+        public Map<FlowRule, TypedStoredFlowEntry> previousLong() {
+            return previousLong;
+        }
+        public Map<FlowRule, TypedStoredFlowEntry> currentUnknown() {
+            return currentUnknown;
+        }
+        public Map<FlowRule, TypedStoredFlowEntry> previousUnknown() {
+            return previousUnknown;
+        }
+
+        /**
+         * Validates values are not empty.
+         *
+         * @return false if either of the sets is empty. Otherwise, true.
+         */
+        public boolean isValid() {
+            return !(currentAll.isEmpty() || previousAll.isEmpty());
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(currentAll, previousAll);
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+            if (!(obj instanceof TypedStatistics)) {
+                return false;
+            }
+            final TypedStatistics other = (TypedStatistics) obj;
+            return Objects.equals(this.currentAll, other.currentAll) &&
+                    Objects.equals(this.previousAll, other.previousAll);
+        }
+
+        @Override
+        public String toString() {
+            return MoreObjects.toStringHelper(this)
+                    .add("current", currentAll)
+                    .add("previous", previousAll)
+                    .toString();
+        }
+    }
+
+    private void checkLoadValidity(Set<FlowEntry> current, Set<FlowEntry> previous) {
+        current.stream().forEach(c -> {
+            FlowEntry f = previous.stream().filter(p -> c.equals(p)).
+                    findAny().orElse(null);
+            if (f != null && c.bytes() < f.bytes()) {
+                log.debug("FlowStatisticManager:checkLoadValidity():" +
+                        "Error: " + c + " :Previous bytes=" + f.bytes() +
+                        " is larger than current bytes=" + c.bytes() + " !!!");
+            }
+        });
+
+    }
+
+    /**
+     * Creates a predicate that checks the instruction type of a flow entry is the same as
+     * the specified instruction type.
+     *
+     * @param instType instruction type to be checked
+     * @return predicate
+     */
+    private static Predicate<FlowEntry> hasInstructionType(Instruction.Type instType) {
+        return new Predicate<FlowEntry>() {
+            @Override
+            public boolean apply(FlowEntry flowEntry) {
+                List<Instruction> allInstructions = flowEntry.treatment().allInstructions();
+
+                return allInstructions.stream().filter(i -> i.type() == instType).findAny().isPresent();
+            }
+        };
+    }
+
+    /**
+     * Internal flow rule event listener for FlowStatisticManager.
+     */
+    private class InternalFlowRuleStatsListener implements FlowRuleListener {
+
+        @Override
+        public void event(FlowRuleEvent event) {
+            FlowRule rule = event.subject();
+            switch (event.type()) {
+                case RULE_ADDED:
+                    if (rule instanceof FlowEntry) {
+                        flowStatisticStore.addFlowStatistic((FlowEntry) rule);
+                    }
+                    break;
+                case RULE_UPDATED:
+                    flowStatisticStore.updateFlowStatistic((FlowEntry) rule);
+                    break;
+                case RULE_ADD_REQUESTED:
+                    break;
+                case RULE_REMOVE_REQUESTED:
+                    break;
+                case RULE_REMOVED:
+                    flowStatisticStore.removeFlowStatistic(rule);
+                    break;
+                default:
+                    log.warn("Unknown flow rule event {}", event);
+            }
+        }
+    }
+}
diff --git a/core/store/dist/src/main/java/org/onosproject/store/statistic/impl/DistributedFlowStatisticStore.java b/core/store/dist/src/main/java/org/onosproject/store/statistic/impl/DistributedFlowStatisticStore.java
new file mode 100644
index 0000000..40c3e2d
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/statistic/impl/DistributedFlowStatisticStore.java
@@ -0,0 +1,288 @@
+/*
+ * 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.store.statistic.impl;
+
+import com.google.common.base.Objects;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.util.KryoNamespace;
+import org.onlab.util.Tools;
+import org.onosproject.cluster.ClusterService;
+import org.onosproject.cluster.NodeId;
+import org.onosproject.mastership.MastershipService;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.flow.FlowEntry;
+import org.onosproject.net.flow.FlowRule;
+import org.onosproject.net.flow.instructions.Instruction;
+import org.onosproject.net.flow.instructions.Instructions;
+import org.onosproject.net.statistic.FlowStatisticStore;
+import org.onosproject.store.cluster.messaging.ClusterCommunicationService;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.serializers.KryoSerializer;
+import org.slf4j.Logger;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+import static org.onlab.util.Tools.groupedThreads;
+import static org.onosproject.store.statistic.impl.StatisticStoreMessageSubjects.GET_CURRENT;
+import static org.onosproject.store.statistic.impl.StatisticStoreMessageSubjects.GET_PREVIOUS;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Maintains flow statistics using RPC calls to collect stats from remote instances
+ * on demand.
+ */
+@Component(immediate = true)
+@Service
+public class DistributedFlowStatisticStore implements FlowStatisticStore {
+    private final Logger log = getLogger(getClass());
+
+    // TODO: Make configurable.
+    private static final int MESSAGE_HANDLER_THREAD_POOL_SIZE = 4;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected MastershipService mastershipService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected ClusterCommunicationService clusterCommunicator;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected ClusterService clusterService;
+
+    private Map<ConnectPoint, Set<FlowEntry>> previous =
+            new ConcurrentHashMap<>();
+
+    private Map<ConnectPoint, Set<FlowEntry>> current =
+            new ConcurrentHashMap<>();
+
+    protected static final KryoSerializer SERIALIZER = new KryoSerializer() {
+        @Override
+        protected void setupKryoPool() {
+            serializerPool = KryoNamespace.newBuilder()
+                    .register(KryoNamespaces.API)
+                    .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
+                            // register this store specific classes here
+                    .build();
+        }
+    };
+
+    private NodeId local;
+    private ExecutorService messageHandlingExecutor;
+
+    private static final long STATISTIC_STORE_TIMEOUT_MILLIS = 3000;
+
+    @Activate
+    public void activate() {
+        local = clusterService.getLocalNode().id();
+
+        messageHandlingExecutor = Executors.newFixedThreadPool(
+                MESSAGE_HANDLER_THREAD_POOL_SIZE,
+                groupedThreads("onos/store/statistic", "message-handlers"));
+
+        clusterCommunicator.addSubscriber(
+                GET_CURRENT, SERIALIZER::decode, this::getCurrentStatisticInternal, SERIALIZER::encode,
+                messageHandlingExecutor);
+
+        clusterCommunicator.addSubscriber(
+                GET_CURRENT, SERIALIZER::decode, this::getPreviousStatisticInternal, SERIALIZER::encode,
+                messageHandlingExecutor);
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        clusterCommunicator.removeSubscriber(GET_PREVIOUS);
+        clusterCommunicator.removeSubscriber(GET_CURRENT);
+        messageHandlingExecutor.shutdown();
+        log.info("Stopped");
+    }
+
+    @Override
+    public synchronized void removeFlowStatistic(FlowRule rule) {
+        ConnectPoint cp = buildConnectPoint(rule);
+        if (cp == null) {
+            return;
+        }
+
+        // remove this rule if present from current map
+        current.computeIfPresent(cp, (c, e) -> { e.remove(rule); return e;  });
+
+        // remove this on if present from previous map
+        previous.computeIfPresent(cp, (c, e) -> { e.remove(rule); return e; });
+    }
+
+    @Override
+    public synchronized void addFlowStatistic(FlowEntry rule) {
+        ConnectPoint cp = buildConnectPoint(rule);
+        if (cp == null) {
+            return;
+        }
+
+        // create one if absent and add this rule
+        current.putIfAbsent(cp, new HashSet<>());
+        current.computeIfPresent(cp, (c, e) -> { e.add(rule); return e; });
+
+        // remove previous one if present
+        previous.computeIfPresent(cp, (c, e) -> { e.remove(rule); return e; });
+    }
+
+    public synchronized void updateFlowStatistic(FlowEntry rule) {
+        ConnectPoint cp = buildConnectPoint(rule);
+        if (cp == null) {
+            return;
+        }
+
+        Set<FlowEntry> curr = current.get(cp);
+        if (curr == null) {
+            addFlowStatistic(rule);
+        } else {
+            FlowEntry f = curr.stream().filter(c -> rule.equals(c)).
+                    findAny().orElse(null);
+            if (rule.bytes() < f.bytes()) {
+                log.debug("DistributedFlowStatisticStore:updateFlowStatistic():" +
+                        " Invalid Flow Update! Will be removed!!" +
+                        " curr flowId=" + Long.toHexString(rule.id().value()) +
+                        ", prev flowId=" + Long.toHexString(f.id().value()) +
+                        ", curr bytes=" + rule.bytes() + ", prev bytes=" + f.bytes() +
+                        ", curr life=" + rule.life() + ", prev life=" + f.life() +
+                        ", curr lastSeen=" + rule.lastSeen() + ", prev lastSeen=" + f.lastSeen());
+                // something is wrong! invalid flow entry, so delete it
+                removeFlowStatistic(rule);
+                return;
+            }
+            Set<FlowEntry> prev = previous.get(cp);
+            if (prev == null) {
+                prev = new HashSet<>();
+                previous.put(cp, prev);
+            }
+
+            // previous one is exist
+            if (f != null) {
+                // remove old one and add new one
+                prev.remove(rule);
+                if (!prev.add(f)) {
+                    log.debug("DistributedFlowStatisticStore:updateFlowStatistic():" +
+                                    " flowId={}, add failed into previous.",
+                            Long.toHexString(rule.id().value()));
+                }
+            }
+
+            // remove old one and add new one
+            curr.remove(rule);
+            if (!curr.add(rule)) {
+                log.debug("DistributedFlowStatisticStore:updateFlowStatistic():" +
+                                " flowId={}, add failed into current.",
+                        Long.toHexString(rule.id().value()));
+            }
+        }
+    }
+
+    @Override
+    public Set<FlowEntry> getCurrentFlowStatistic(ConnectPoint connectPoint) {
+        final DeviceId deviceId = connectPoint.deviceId();
+
+        NodeId master = mastershipService.getMasterFor(deviceId);
+        if (master == null) {
+            log.warn("No master for {}", deviceId);
+            return Collections.emptySet();
+        }
+
+        if (Objects.equal(local, master)) {
+            return getCurrentStatisticInternal(connectPoint);
+        } else {
+            return Tools.futureGetOrElse(clusterCommunicator.sendAndReceive(
+                            connectPoint,
+                            GET_CURRENT,
+                            SERIALIZER::encode,
+                            SERIALIZER::decode,
+                            master),
+                    STATISTIC_STORE_TIMEOUT_MILLIS,
+                    TimeUnit.MILLISECONDS,
+                    Collections.emptySet());
+        }
+    }
+
+    private synchronized Set<FlowEntry> getCurrentStatisticInternal(ConnectPoint connectPoint) {
+        return current.get(connectPoint);
+    }
+
+    @Override
+    public Set<FlowEntry> getPreviousFlowStatistic(ConnectPoint connectPoint) {
+        final DeviceId deviceId = connectPoint.deviceId();
+
+        NodeId master = mastershipService.getMasterFor(deviceId);
+        if (master == null) {
+            log.warn("No master for {}", deviceId);
+            return Collections.emptySet();
+        }
+
+        if (Objects.equal(local, master)) {
+            return getPreviousStatisticInternal(connectPoint);
+        } else {
+            return Tools.futureGetOrElse(clusterCommunicator.sendAndReceive(
+                            connectPoint,
+                            GET_PREVIOUS,
+                            SERIALIZER::encode,
+                            SERIALIZER::decode,
+                            master),
+                    STATISTIC_STORE_TIMEOUT_MILLIS,
+                    TimeUnit.MILLISECONDS,
+                    Collections.emptySet());
+        }
+    }
+
+    private synchronized Set<FlowEntry> getPreviousStatisticInternal(ConnectPoint connectPoint) {
+        return previous.get(connectPoint);
+    }
+
+    private ConnectPoint buildConnectPoint(FlowRule rule) {
+        PortNumber port = getOutput(rule);
+
+        if (port == null) {
+            return null;
+        }
+        ConnectPoint cp = new ConnectPoint(rule.deviceId(), port);
+        return cp;
+    }
+
+    private PortNumber getOutput(FlowRule rule) {
+        for (Instruction i : rule.treatment().allInstructions()) {
+            if (i.type() == Instruction.Type.OUTPUT) {
+                Instructions.OutputInstruction out = (Instructions.OutputInstruction) i;
+                return out.port();
+            }
+            if (i.type() == Instruction.Type.DROP) {
+                return PortNumber.P0;
+            }
+        }
+        return null;
+    }
+}
\ No newline at end of file
diff --git a/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/NewAdaptiveFlowStatsCollector.java b/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/NewAdaptiveFlowStatsCollector.java
index 181ba00..a81367c 100644
--- a/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/NewAdaptiveFlowStatsCollector.java
+++ b/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/NewAdaptiveFlowStatsCollector.java
@@ -717,25 +717,9 @@
             long curTime = (cTime > 0 ? cTime : System.currentTimeMillis());
             // For latency adjustment(default=500 millisecond) between FlowStatsRequest and Reply
             long fromLastSeen = ((curTime - fe.lastSeen() + latencyFlowStatsRequestAndReplyMillis) / 1000);
-
             // fe.life() unit is SECOND!
             long liveTime = fe.life() + fromLastSeen;
 
-            // check flow timeout
-            if (fe.timeout() > calAndPollInterval && fromLastSeen > fe.timeout()) {
-                if (!fe.isPermanent()) {
-                    log.debug("checkAndMoveLiveFlowInternal, FlowId=" + Long.toHexString(fe.id().value())
-                                    + ", liveType=" + fe.flowLiveType()
-                                    + ", liveTime=" + liveTime
-                                    + ", life=" + fe.life()
-                                    + ", fromLastSeen=" + fromLastSeen
-                                    + ", timeout=" + fe.timeout()
-                                    + ", isPermanent=" + fe.isPermanent()
-                                    + " AdaptiveStats collection thread for {}",
-                            sw.getStringId());
-                    return false;
-                }
-            }
 
             switch (fe.flowLiveType()) {
                 case IMMEDIATE_FLOW: