diff --git a/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/DefaultLinkInfo.java b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/DefaultLinkInfo.java
new file mode 100644
index 0000000..fa494ca
--- /dev/null
+++ b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/DefaultLinkInfo.java
@@ -0,0 +1,190 @@
+/*
+ * Copyright 2019-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.onosproject.openstacktelemetry.api;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+
+/**
+ * Implementation of Link info.
+ */
+public final class DefaultLinkInfo implements LinkInfo {
+
+    private final String linkId;
+    private final String srcIp;
+    private final int srcPort;
+    private final String dstIp;
+    private final int dstPort;
+    private final LinkStatsInfo statsInfo;
+    private final String protocol;
+
+    // default constructor not intended for invoked outside of this class
+    private DefaultLinkInfo(String linkId, String srcIp, int srcPort,
+                            String dstIp, int dstPort,
+                            LinkStatsInfo statsInfo, String protocol) {
+        this.linkId = linkId;
+        this.srcIp = srcIp;
+        this.srcPort = srcPort;
+        this.dstIp = dstIp;
+        this.dstPort = dstPort;
+        this.statsInfo = statsInfo;
+        this.protocol = protocol;
+    }
+
+    @Override
+    public String linkId() {
+        return linkId;
+    }
+
+    @Override
+    public String srcIp() {
+        return srcIp;
+    }
+
+    @Override
+    public int srcPort() {
+        return srcPort;
+    }
+
+    @Override
+    public String dstIp() {
+        return dstIp;
+    }
+
+    @Override
+    public int dstPort() {
+        return dstPort;
+    }
+
+    @Override
+    public LinkStatsInfo linkStats() {
+        return statsInfo;
+    }
+
+    @Override
+    public String protocol() {
+        return protocol;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultLinkInfo that = (DefaultLinkInfo) o;
+        return srcPort == that.srcPort &&
+                dstPort == that.dstPort &&
+                Objects.equal(linkId, that.linkId) &&
+                Objects.equal(srcIp, that.srcIp) &&
+                Objects.equal(dstIp, that.dstIp) &&
+                Objects.equal(statsInfo, that.statsInfo) &&
+                Objects.equal(protocol, that.protocol);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(linkId, srcIp, srcPort, dstIp, dstPort, statsInfo, protocol);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("linkId", linkId)
+                .add("srcIp", srcIp)
+                .add("srcPort", srcPort)
+                .add("dstIp", dstIp)
+                .add("dstPort", dstPort)
+                .add("statsInfo", statsInfo)
+                .add("protocol", protocol)
+                .toString();
+    }
+
+    /**
+     * Obtains a default link info builder object.
+     *
+     * @return link info builder object
+     */
+    public static LinkInfo.Builder builder() {
+        return new DefaultLinkInfo.DefaultBuilder();
+    }
+
+    /**
+     * Builder class of LinkInfo.
+     */
+    public static final class DefaultBuilder implements LinkInfo.Builder {
+        private String linkId;
+        private String srcIp;
+        private int srcPort;
+        private String dstIp;
+        private int dstPort;
+        private LinkStatsInfo linkStats;
+        private String protocol;
+
+        private DefaultBuilder() {
+        }
+
+        @Override
+        public Builder withLinkId(String linkId) {
+            this.linkId = linkId;
+            return this;
+        }
+
+        @Override
+        public Builder withSrcIp(String srcIp) {
+            this.srcIp = srcIp;
+            return this;
+        }
+
+        @Override
+        public Builder withSrcPort(int srcPort) {
+            this.srcPort = srcPort;
+            return this;
+        }
+
+        @Override
+        public Builder withDstIp(String dstIp) {
+            this.dstIp = dstIp;
+            return this;
+        }
+
+        @Override
+        public Builder withDstPort(int dstPort) {
+            this.dstPort = dstPort;
+            return this;
+        }
+
+        @Override
+        public Builder withLinkStats(LinkStatsInfo linkStats) {
+            this.linkStats = linkStats;
+            return this;
+        }
+
+        @Override
+        public Builder withProtocol(String protocol) {
+            this.protocol = protocol;
+            return this;
+        }
+
+        @Override
+        public DefaultLinkInfo build() {
+            return new DefaultLinkInfo(linkId, srcIp, srcPort, dstIp,
+                    dstPort, linkStats, protocol);
+        }
+    }
+}
diff --git a/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/DefaultLinkStatsInfo.java b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/DefaultLinkStatsInfo.java
new file mode 100644
index 0000000..8cf0089
--- /dev/null
+++ b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/DefaultLinkStatsInfo.java
@@ -0,0 +1,189 @@
+/*
+ * Copyright 2019-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.onosproject.openstacktelemetry.api;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+
+/**
+ * Implementation of Link stats info.
+ */
+public final class DefaultLinkStatsInfo implements LinkStatsInfo {
+
+    private final long txPacket;
+    private final long rxPacket;
+    private final long txByte;
+    private final long rxByte;
+    private final long txDrop;
+    private final long rxDrop;
+    private final long timestamp;
+
+    // private constructor not indented for invoked at outside of this class
+    private DefaultLinkStatsInfo(long txPacket, long rxPacket, long txByte,
+                                 long rxByte, long txDrop, long rxDrop, long timestamp) {
+        this.txPacket = txPacket;
+        this.rxPacket = rxPacket;
+        this.txByte = txByte;
+        this.rxByte = rxByte;
+        this.txDrop = txDrop;
+        this.rxDrop = rxDrop;
+        this.timestamp = timestamp;
+    }
+
+    @Override
+    public long getTxPacket() {
+        return txPacket;
+    }
+
+    @Override
+    public long getRxPacket() {
+        return rxPacket;
+    }
+
+    @Override
+    public long getTxByte() {
+        return txByte;
+    }
+
+    @Override
+    public long getRxByte() {
+        return rxByte;
+    }
+
+    @Override
+    public long getTxDrop() {
+        return txDrop;
+    }
+
+    @Override
+    public long getRxDrop() {
+        return rxDrop;
+    }
+
+    @Override
+    public long getTimestamp() {
+        return timestamp;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultLinkStatsInfo that = (DefaultLinkStatsInfo) o;
+        return txPacket == that.txPacket &&
+                rxPacket == that.rxPacket &&
+                txByte == that.txByte &&
+                rxByte == that.rxByte &&
+                txDrop == that.txDrop &&
+                rxDrop == that.rxDrop &&
+                timestamp == that.timestamp;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(txPacket, rxPacket, txByte, rxByte, txDrop, rxDrop, timestamp);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("txPacket", txPacket)
+                .add("rxPacket", rxPacket)
+                .add("txByte", txByte)
+                .add("rxByte", rxByte)
+                .add("txDrop", txDrop)
+                .add("rxDrop", rxDrop)
+                .add("timestamp", timestamp)
+                .toString();
+    }
+
+    /**
+     * Obtains a default link stats info builder object.
+     *
+     * @return link stats info builder object
+     */
+    public static LinkStatsInfo.Builder builder() {
+        return new DefaultLinkStatsInfo.DefaultBuilder();
+    }
+
+    /**
+     * Builder class of LinkStatsInfo.
+     */
+    public static final class DefaultBuilder implements LinkStatsInfo.Builder {
+        private long txPacket;
+        private long rxPacket;
+        private long txByte;
+        private long rxByte;
+        private long txDrop;
+        private long rxDrop;
+        private long timestamp;
+
+        private DefaultBuilder() {
+        }
+
+        @Override
+        public DefaultBuilder withTxPacket(long txPacket) {
+            this.txPacket = txPacket;
+            return this;
+        }
+
+        @Override
+        public DefaultBuilder withRxPacket(long rxPacket) {
+            this.rxPacket = rxPacket;
+            return this;
+        }
+
+        @Override
+        public DefaultBuilder withTxByte(long txByte) {
+            this.txByte = txByte;
+            return this;
+        }
+
+        @Override
+        public DefaultBuilder withRxByte(long rxByte) {
+            this.rxByte = rxByte;
+            return this;
+        }
+
+        @Override
+        public DefaultBuilder withTxDrop(long txDrop) {
+            this.txDrop = txDrop;
+            return this;
+        }
+
+        @Override
+        public DefaultBuilder withRxDrop(long rxDrop) {
+            this.rxDrop = rxDrop;
+            return this;
+        }
+
+        @Override
+        public DefaultBuilder withTimestamp(long timestamp) {
+            this.timestamp = timestamp;
+            return this;
+        }
+
+        @Override
+        public LinkStatsInfo build() {
+            return new DefaultLinkStatsInfo(txPacket, rxPacket, txByte, rxByte,
+                    txDrop, rxDrop, timestamp);
+        }
+    }
+}
diff --git a/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/LinkInfo.java b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/LinkInfo.java
new file mode 100644
index 0000000..fa30fa5
--- /dev/null
+++ b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/LinkInfo.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright 2019-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.onosproject.openstacktelemetry.api;
+
+/**
+ * Link info interface.
+ */
+public interface LinkInfo {
+
+    /**
+     * Obtains the link identification.
+     *
+     * @return link identification
+     */
+    String linkId();
+
+    /**
+     * Obtains the source IP.
+     *
+     * @return source IP
+     */
+    String srcIp();
+
+    /**
+     * Obtains source port number.
+     *
+     * @return source port index
+     */
+    int srcPort();
+
+    /**
+     * Obtains the destination IP.
+     *
+     * @return destination IP
+     */
+    String dstIp();
+
+    /**
+     * Obtains destination port number.
+     *
+     * @return destination port number
+     */
+    int dstPort();
+
+    /**
+     * Obtains link stats.
+     *
+     * @return link stats
+     */
+    LinkStatsInfo linkStats();
+
+    /**
+     * Obtains protocol (e.g., TCP/UDP/ICMP).
+     *
+     * @return protocol
+     */
+    String protocol();
+
+    /**
+     * Interface of link info builder.
+     */
+    interface Builder {
+
+        /**
+         * Sets link identifier.
+         *
+         * @param linkId link identifier
+         * @return builder instance
+         */
+        Builder withLinkId(String linkId);
+
+        /**
+         * Sets the link source IP.
+         *
+         * @param srcIp link source IP
+         * @return builder instance
+         */
+        Builder withSrcIp(String srcIp);
+
+        /**
+         * Sets the source port number.
+         *
+         * @param srcPort source port number
+         * @return builder instance
+         */
+        Builder withSrcPort(int srcPort);
+
+        /**
+         * Sets the link destination IP.
+         *
+         * @param dstIp link destination IP
+         * @return builder instance
+         */
+        Builder withDstIp(String dstIp);
+
+        /**
+         * Sets the destination port number.
+         *
+         * @param dstPort destination port number
+         * @return builder instance
+         */
+        Builder withDstPort(int dstPort);
+
+        /**
+         * Sets the link stats.
+         *
+         * @param linkStats link stats
+         * @return builder instance
+         */
+        Builder withLinkStats(LinkStatsInfo linkStats);
+
+        /**
+         * Sets protocol.
+         *
+         * @param protocol protocol
+         * @return builder instance
+         */
+        Builder withProtocol(String protocol);
+
+        /**
+         * Creates a LinkInfo instance.
+         *
+         * @return LinkInfo instance
+         */
+        DefaultLinkInfo build();
+    }
+}
diff --git a/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/LinkStatsInfo.java b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/LinkStatsInfo.java
new file mode 100644
index 0000000..b159c32
--- /dev/null
+++ b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/LinkStatsInfo.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright 2019-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.onosproject.openstacktelemetry.api;
+
+/**
+ * Link stats info interface.
+ */
+public interface LinkStatsInfo {
+
+    /**
+     * Obtains TX packet count.
+     *
+     * @return TX packet count
+     */
+    long getTxPacket();
+
+    /**
+     * Obtains RX packet count.
+     *
+     * @return RX packet count
+     */
+    long getRxPacket();
+
+    /**
+     * Obtains TX byte count.
+     *
+     * @return TX byte count
+     */
+    long getTxByte();
+
+    /**
+     * Obtains RX byte count.
+     *
+     * @return RX byte count
+     */
+    long getRxByte();
+
+    /**
+     * Obtains TX drop count.
+     *
+     * @return TX drop count
+     */
+    long getTxDrop();
+
+    /**
+     * Obtains RX drop count.
+     *
+     * @return RX drop count
+     */
+    long getRxDrop();
+
+    /**
+     * Obtains timestamp.
+     *
+     * @return timestamp
+     */
+    long getTimestamp();
+
+    /**
+     * Builder class of LinkStatsInfo.
+     */
+    interface Builder {
+
+        /**
+         * Sets TX packet count.
+         *
+         * @param txPacket TX packet count
+         * @return builder instance
+         */
+        Builder withTxPacket(long txPacket);
+
+        /**
+         * Sets RX packet count.
+         *
+         * @param rxPacket RX packet count
+         * @return builder instance
+         */
+        Builder withRxPacket(long rxPacket);
+
+        /**
+         * Sets TX byte count.
+         *
+         * @param txByte TX byte count
+         * @return builder instance
+         */
+        Builder withTxByte(long txByte);
+
+        /**
+         * Sets RX byte count.
+         *
+         * @param rxByte RX byte count
+         * @return builder instance
+         */
+        Builder withRxByte(long rxByte);
+
+        /**
+         * Sets TX drop count.
+         *
+         * @param txDrop TX drop count
+         * @return builder instance
+         */
+        Builder withTxDrop(long txDrop);
+
+        /**
+         * Sets RX drop count.
+         *
+         * @param rxDrop RX drop count
+         * @return builder instance
+         */
+        Builder withRxDrop(long rxDrop);
+
+        /**
+         * Sets timestamp.
+         *
+         * @param timestamp timestamp
+         * @return builder instance
+         */
+        Builder withTimestamp(long timestamp);
+
+        /**
+         * Creates a LinkStatsInfo instance.
+         *
+         * @return builder instance
+         */
+        LinkStatsInfo build();
+    }
+}
diff --git a/apps/openstacktelemetry/api/src/test/java/org/onosproject/openstacktelemetry/api/DefaultLinkInfoTest.java b/apps/openstacktelemetry/api/src/test/java/org/onosproject/openstacktelemetry/api/DefaultLinkInfoTest.java
new file mode 100644
index 0000000..2099d61
--- /dev/null
+++ b/apps/openstacktelemetry/api/src/test/java/org/onosproject/openstacktelemetry/api/DefaultLinkInfoTest.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2019-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.onosproject.openstacktelemetry.api;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Before;
+import org.junit.Test;
+
+import static junit.framework.TestCase.assertEquals;
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
+import static org.onosproject.openstacktelemetry.api.DefaultLinkStatsInfoTest.createLinkStatsInfo1;
+import static org.onosproject.openstacktelemetry.api.DefaultLinkStatsInfoTest.createLinkStatsInfo2;
+
+/**
+ * Unit tests for DefaultLinkInfo class.
+ */
+public final class DefaultLinkInfoTest {
+
+    private static final String LINK_ID_1 = "L100";
+    private static final String LINK_ID_2 = "L200";
+
+    private static final String SRC_IP_1 = "10.10.10.1";
+    private static final String SRC_IP_2 = "10.10.10.2";
+
+    private static final int SRC_PORT_1 = 80;
+    private static final int SRC_PORT_2 = 90;
+
+    private static final String DST_IP_1 = "20.20.20.1";
+    private static final String DST_IP_2 = "20.20.20.2";
+
+    private static final int DST_PORT_1 = 100;
+    private static final int DST_PORT_2 = 110;
+
+    private static final LinkStatsInfo LINK_STATS_1 = createLinkStatsInfo1();
+    private static final LinkStatsInfo LINK_STATS_2 = createLinkStatsInfo2();
+
+    private static final String PROTOCOL_1 = "TCP";
+    private static final String PROTOCOL_2 = "UDP";
+
+    private LinkInfo info1;
+    private LinkInfo sameAsInfo1;
+    private LinkInfo info2;
+
+    /**
+     * Initial setup for this unit test.
+     */
+    @Before
+    public void setUp() {
+        LinkInfo.Builder builder1 = DefaultLinkInfo.builder();
+        LinkInfo.Builder builder2 = DefaultLinkInfo.builder();
+        LinkInfo.Builder builder3 = DefaultLinkInfo.builder();
+
+        info1 = builder1
+                .withLinkId(LINK_ID_1)
+                .withSrcIp(SRC_IP_1)
+                .withSrcPort(SRC_PORT_1)
+                .withDstIp(DST_IP_1)
+                .withDstPort(DST_PORT_1)
+                .withLinkStats(LINK_STATS_1)
+                .withProtocol(PROTOCOL_1)
+                .build();
+
+        sameAsInfo1 = builder2
+                .withLinkId(LINK_ID_1)
+                .withSrcIp(SRC_IP_1)
+                .withSrcPort(SRC_PORT_1)
+                .withDstIp(DST_IP_1)
+                .withDstPort(DST_PORT_1)
+                .withLinkStats(LINK_STATS_1)
+                .withProtocol(PROTOCOL_1)
+                .build();
+
+        info2 = builder3
+                .withLinkId(LINK_ID_2)
+                .withSrcIp(SRC_IP_2)
+                .withSrcPort(SRC_PORT_2)
+                .withDstIp(DST_IP_2)
+                .withDstPort(DST_PORT_2)
+                .withLinkStats(LINK_STATS_2)
+                .withProtocol(PROTOCOL_2)
+                .build();
+    }
+
+    /**
+     * Tests class immutability.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(DefaultLinkInfo.class);
+    }
+
+    /**
+     * Tests object equality.
+     */
+    @Test
+    public void testEquality() {
+        new EqualsTester()
+                .addEqualityGroup(info1, sameAsInfo1)
+                .addEqualityGroup(info2).testEquals();
+    }
+
+    /**
+     * Tests object construction.
+     */
+    @Test
+    public void testConstruction() {
+        LinkInfo info = info1;
+
+        assertEquals(LINK_ID_1, info.linkId());
+        assertEquals(SRC_IP_1, info.srcIp());
+        assertEquals(SRC_PORT_1, info.srcPort());
+        assertEquals(DST_IP_1, info.dstIp());
+        assertEquals(DST_PORT_1, info.dstPort());
+        assertEquals(LINK_STATS_1, info.linkStats());
+        assertEquals(PROTOCOL_1, info.protocol());
+    }
+}
diff --git a/apps/openstacktelemetry/api/src/test/java/org/onosproject/openstacktelemetry/api/DefaultLinkStatsInfoTest.java b/apps/openstacktelemetry/api/src/test/java/org/onosproject/openstacktelemetry/api/DefaultLinkStatsInfoTest.java
new file mode 100644
index 0000000..ed73671
--- /dev/null
+++ b/apps/openstacktelemetry/api/src/test/java/org/onosproject/openstacktelemetry/api/DefaultLinkStatsInfoTest.java
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2019-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.onosproject.openstacktelemetry.api;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Before;
+import org.junit.Test;
+
+import static junit.framework.TestCase.assertEquals;
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
+
+/**
+ * Unit tests for DefaultLinkStatsInfo class.
+ */
+public final class DefaultLinkStatsInfoTest {
+
+    private static final long TX_PACKET_1 = 1;
+    private static final long TX_PACKET_2 = 2;
+
+    private static final long RX_PACKET_1 = 1;
+    private static final long RX_PACKET_2 = 2;
+
+    private static final long TX_BYTE_1 = 1;
+    private static final long TX_BYTE_2 = 2;
+
+    private static final long RX_BYTE_1 = 1;
+    private static final long RX_BYTE_2 = 2;
+
+    private static final long TX_DROP_1 = 1;
+    private static final long TX_DROP_2 = 2;
+
+    private static final long RX_DROP_1 = 1;
+    private static final long RX_DROP_2 = 2;
+
+    private static final long TIMESTAMP_1 = 10;
+    private static final long TIMESTAMP_2 = 20;
+
+    private LinkStatsInfo info1;
+    private LinkStatsInfo sameAsInfo1;
+    private LinkStatsInfo info2;
+
+    static LinkStatsInfo createLinkStatsInfo1() {
+        return DefaultLinkStatsInfo.builder()
+                .withTxPacket(TX_PACKET_1)
+                .withRxPacket(RX_PACKET_1)
+                .withTxByte(TX_BYTE_1)
+                .withRxByte(RX_BYTE_1)
+                .withTxDrop(TX_DROP_1)
+                .withRxDrop(RX_DROP_1)
+                .withTimestamp(TIMESTAMP_1)
+                .build();
+    }
+
+    static LinkStatsInfo createLinkStatsInfo2() {
+        return DefaultLinkStatsInfo.builder()
+                .withTxPacket(TX_PACKET_2)
+                .withRxPacket(RX_PACKET_2)
+                .withTxByte(TX_BYTE_2)
+                .withRxByte(RX_BYTE_2)
+                .withTxDrop(TX_DROP_2)
+                .withRxDrop(RX_DROP_2)
+                .withTimestamp(TIMESTAMP_2)
+                .build();
+    }
+
+    /**
+     * Initial setup for this unit test.
+     */
+    @Before
+    public void setUp() {
+        info1 = createLinkStatsInfo1();
+        sameAsInfo1 = createLinkStatsInfo1();
+        info2 = createLinkStatsInfo2();
+    }
+
+    /**
+     * Tests class immutability.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(DefaultLinkStatsInfo.class);
+    }
+
+    /**
+     * Tests object equality.
+     */
+    @Test
+    public void testEquality() {
+        new EqualsTester()
+                .addEqualityGroup(info1, sameAsInfo1)
+                .addEqualityGroup(info2).testEquals();
+    }
+
+    /**
+     * Tests object construction.
+     */
+    @Test
+    public void testConstruction() {
+        LinkStatsInfo info = info1;
+
+        assertEquals(TX_PACKET_1, info.getTxPacket());
+        assertEquals(RX_PACKET_1, info.getRxPacket());
+        assertEquals(TX_BYTE_1, info.getTxByte());
+        assertEquals(RX_BYTE_1, info.getRxByte());
+        assertEquals(TX_DROP_1, info.getTxDrop());
+        assertEquals(RX_DROP_1, info.getRxDrop());
+        assertEquals(TIMESTAMP_1, info.getTimestamp());
+    }
+}