diff --git a/api/src/main/java/org/opencord/aaa/AaaConfig.java b/api/src/main/java/org/opencord/aaa/AaaConfig.java
index 3072ff5..2c4aa7b 100644
--- a/api/src/main/java/org/opencord/aaa/AaaConfig.java
+++ b/api/src/main/java/org/opencord/aaa/AaaConfig.java
@@ -85,7 +85,6 @@
     // Packet Customizer Default value
     protected static final String DEFAULT_PACKET_CUSTOMIZER = "default";
 
-
     /**
      * Gets the value of a string property, protecting for an empty
      * JSON object.
diff --git a/api/src/main/java/org/opencord/aaa/AaaStatistics.java b/api/src/main/java/org/opencord/aaa/AaaStatistics.java
new file mode 100644
index 0000000..9764427
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AaaStatistics.java
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.opencord.aaa;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+public class AaaStatistics {
+    //Number of access accept packets sent to the server
+    private AtomicLong acceptResponsesRx = new AtomicLong();
+    //Number of access reject packets sent to the server
+    private AtomicLong rejectResponsesRx = new AtomicLong();
+    //Number of access challenge packets sent to the server
+    private AtomicLong challengeResponsesRx = new AtomicLong();
+    //Number of access request packets sent to the server
+    private AtomicLong accessRequestsTx = new AtomicLong();
+    //Number of access request packets pending a response from the server
+    private AtomicLong pendingRequests = new AtomicLong();
+    //Number of packets of an unknown RADIUS type received from the accounting server
+    private AtomicLong unknownTypeRx = new AtomicLong();
+    //Number of access response packets received from the server with an invalid validator
+    private AtomicLong invalidValidatorsRx = new AtomicLong();
+    //Number of dropped packets received from the accounting server
+    private AtomicLong droppedResponsesRx = new AtomicLong();
+    //Number of malformed access response packets received from the server
+    private AtomicLong malformedResponsesRx = new AtomicLong();
+    //Number of packets received from an unknown server
+    private AtomicLong unknownServerRx = new AtomicLong();
+    //Roundtrip packet time to the accounting server
+    private AtomicLong requestRttMilis = new AtomicLong();
+    //Number of access request packets retransmitted to the server
+    private AtomicLong requestReTx = new AtomicLong();
+    //Number of sessions expired
+    private AtomicLong numberOfSessionsExpired = new AtomicLong();
+
+    public Long getRequestReTx() {
+        return requestReTx.get();
+    }
+
+    public void setRequestRttMilis(AtomicLong requestRttMilis) {
+        this.requestRttMilis = requestRttMilis;
+    }
+
+    public Long getUnknownServerRx() {
+        return unknownServerRx.get();
+    }
+
+    public Long getRequestRttMilis() {
+        return requestRttMilis.get();
+    }
+
+    public Long getMalformedResponsesRx() {
+        return malformedResponsesRx.get();
+    }
+
+    public Long getDroppedResponsesRx() {
+        return droppedResponsesRx.get();
+    }
+
+    public Long getInvalidValidatorsRx() {
+        return invalidValidatorsRx.get();
+    }
+
+    public Long getAcceptResponsesRx() {
+        return acceptResponsesRx.get();
+    }
+
+    public Long getRejectResponsesRx() {
+        return rejectResponsesRx.get();
+    }
+
+    public Long getChallengeResponsesRx() {
+        return challengeResponsesRx.get();
+    }
+
+    public Long getAccessRequestsTx() {
+        return accessRequestsTx.get();
+    }
+
+    public Long getPendingRequests() {
+        return pendingRequests.get();
+    }
+
+    public Long getUnknownTypeRx() {
+        return unknownTypeRx.get();
+    }
+
+    public void increaseAcceptResponsesRx() {
+        acceptResponsesRx.incrementAndGet();
+    }
+
+    public void increaseRejectResponsesRx() {
+        rejectResponsesRx.incrementAndGet();
+    }
+
+    public void increaseChallengeResponsesRx() {
+        challengeResponsesRx.incrementAndGet();
+    }
+
+    public void increaseAccessRequestsTx() {
+        accessRequestsTx.incrementAndGet();
+    }
+
+    public void increaseRequestReTx() {
+        requestReTx.incrementAndGet();
+    }
+
+    public void increaseOrDecreasePendingRequests(boolean isIncrement) {
+        if (isIncrement) {
+            pendingRequests.incrementAndGet();
+        } else {
+            pendingRequests.decrementAndGet();
+        }
+    }
+
+    public void increaseUnknownTypeRx() {
+        unknownTypeRx.incrementAndGet();
+    }
+
+    public void increaseMalformedResponsesRx() {
+        malformedResponsesRx.incrementAndGet();
+    }
+
+    public void increaseInvalidValidatorsRx() {
+        invalidValidatorsRx.incrementAndGet();
+    }
+
+    public void incrementUnknownServerRx() {
+        unknownServerRx.incrementAndGet();
+    }
+
+    public void incrementNumberOfSessionsExpired() {
+        numberOfSessionsExpired.incrementAndGet();
+    }
+
+    public void countDroppedResponsesRx() {
+        long numberOfDroppedPackets = invalidValidatorsRx.get();
+        numberOfDroppedPackets += unknownTypeRx.get();
+        numberOfDroppedPackets += malformedResponsesRx.get();
+        numberOfDroppedPackets += numberOfSessionsExpired.get();
+        this.droppedResponsesRx = new AtomicLong(numberOfDroppedPackets);
+    }
+}
diff --git a/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsDelegate.java b/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsDelegate.java
new file mode 100644
index 0000000..b82e82f
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsDelegate.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.opencord.aaa;
+
+import org.onosproject.store.StoreDelegate;
+
+
+/**
+ * Delegate for Authentication Statistics.
+ */
+
+public interface AuthenticationStatisticsDelegate extends StoreDelegate<AuthenticationStatisticsEvent> {
+}
diff --git a/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsEvent.java b/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsEvent.java
new file mode 100644
index 0000000..11c00e3
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsEvent.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.opencord.aaa;
+import org.onosproject.event.AbstractEvent;
+/**
+ * Event indicating the Accounting Data of AAA.
+ */
+public class AuthenticationStatisticsEvent extends
+        AbstractEvent<AuthenticationStatisticsEvent.Type, AaaStatistics> {
+/**
+ * Accounting data.
+ * AuthenticationMetrixEvent event type.
+ */
+    public enum Type {
+        /**
+         * signifies that the Authentication Metrix Event stats has been updated.
+         */
+        STATS_UPDATE
+    }
+    public AuthenticationStatisticsEvent(Type type, AaaStatistics stats) {
+        super(type, stats);
+    }
+}
diff --git a/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsEventListener.java b/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsEventListener.java
new file mode 100644
index 0000000..5cef070
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsEventListener.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.opencord.aaa;
+
+import org.onosproject.event.EventListener;
+
+/**
+ * Listener for accounting events.
+ */
+public interface AuthenticationStatisticsEventListener extends
+        EventListener<AuthenticationStatisticsEvent> {
+}
\ No newline at end of file
diff --git a/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsService.java b/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsService.java
new file mode 100644
index 0000000..bdb9f2d
--- /dev/null
+++ b/api/src/main/java/org/opencord/aaa/AuthenticationStatisticsService.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.opencord.aaa;
+
+import org.onosproject.event.ListenerService;
+
+/**
+ * Service for interacting with accounting module.
+ */
+
+public interface AuthenticationStatisticsService extends
+        ListenerService<AuthenticationStatisticsEvent, AuthenticationStatisticsEventListener> {
+
+    /**
+     * Returns AaaStatistics object.
+     *
+     * @return AaaStatistics
+    */
+    public AaaStatistics getAaaStats();
+
+    /**
+     * Returns AuthenticationStatisticsDelegate object.
+     *
+     * @return AuthenticationStatisticsDelegate
+    */
+    public AuthenticationStatisticsDelegate getStatsDelegate();
+
+    /**
+     * Handle the roundTrip time of Radius Packet.
+     *
+     * @param identifier identifier of incoming radius packet
+    */
+    public void handleRoundtripTime(byte identifier);
+
+    /**
+     * Calculate average roundTrip time of multiple Packets.
+    */
+    public void calculatePacketRoundtripTime();
+
+    /**
+     * Put the identifier value to map.
+     *
+     * @param identifier identifier of incoming radius packet
+    */
+    public void putOutgoingIdentifierToMap(byte identifier);
+}