diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/mcast/McastStoreKey.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/mcast/McastStoreKey.java
new file mode 100644
index 0000000..aa32797
--- /dev/null
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/mcast/McastStoreKey.java
@@ -0,0 +1,134 @@
+/*
+ * 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.onosproject.segmentrouting.mcast;
+
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.VlanId;
+import org.onosproject.net.DeviceId;
+import static com.google.common.base.MoreObjects.toStringHelper;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import java.util.Objects;
+
+/**
+ * Key of multicast next objective store.
+ */
+public class McastStoreKey {
+    // Identify a flow using group address, deviceId, and assigned vlan
+    private final IpAddress mcastIp;
+    private final DeviceId deviceId;
+    private final VlanId vlanId;
+
+    /**
+     * Constructs the key of multicast next objective store.
+     *
+     * @param mcastIp multicast group IP address
+     * @param deviceId device ID
+     *
+     * @deprecated in 1.12 ("Magpie") release.
+     */
+    @Deprecated
+    public McastStoreKey(IpAddress mcastIp, DeviceId deviceId) {
+        checkNotNull(mcastIp, "mcastIp cannot be null");
+        checkNotNull(deviceId, "deviceId cannot be null");
+        checkArgument(mcastIp.isMulticast(), "mcastIp must be a multicast address");
+        this.mcastIp = mcastIp;
+        this.deviceId = deviceId;
+        this.vlanId = null;
+    }
+
+    /**
+     * Constructs the key of multicast next objective store.
+     *
+     * @param mcastIp multicast group IP address
+     * @param deviceId device ID
+     * @param vlanId vlan id
+     */
+    public McastStoreKey(IpAddress mcastIp, DeviceId deviceId, VlanId vlanId) {
+        checkNotNull(mcastIp, "mcastIp cannot be null");
+        checkNotNull(deviceId, "deviceId cannot be null");
+        checkNotNull(vlanId, "vlan id cannot be null");
+        checkArgument(mcastIp.isMulticast(), "mcastIp must be a multicast address");
+        this.mcastIp = mcastIp;
+        this.deviceId = deviceId;
+        // FIXME probably we should avoid not valid values
+        this.vlanId = vlanId;
+    }
+
+    // Constructor for serialization
+    private McastStoreKey() {
+        this.mcastIp = null;
+        this.deviceId = null;
+        this.vlanId = null;
+    }
+
+    /**
+     * Returns the multicast IP address of this key.
+     *
+     * @return multicast IP
+     */
+    public IpAddress mcastIp() {
+        return mcastIp;
+    }
+
+    /**
+     * Returns the device ID of this key.
+     *
+     * @return device ID
+     */
+    public DeviceId deviceId() {
+        return deviceId;
+    }
+
+    /**
+     * Returns the vlan ID of this key.
+     *
+     * @return vlan ID
+     */
+    public VlanId vlanId() {
+        return vlanId;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof McastStoreKey)) {
+            return false;
+        }
+        McastStoreKey that =
+                (McastStoreKey) o;
+        return (Objects.equals(this.mcastIp, that.mcastIp) &&
+                Objects.equals(this.deviceId, that.deviceId) &&
+                Objects.equals(this.vlanId, that.vlanId));
+    }
+
+    @Override
+    public int hashCode() {
+         return Objects.hash(mcastIp, deviceId, vlanId);
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(getClass())
+                .add("mcastIp", mcastIp)
+                .add("deviceId", deviceId)
+                .add("vlanId", vlanId)
+                .toString();
+    }
+}