diff --git a/drivers/optical/src/main/java/org/onosproject/driver/optical/query/DefaultTributarySlotQuery.java b/drivers/optical/src/main/java/org/onosproject/driver/optical/query/DefaultTributarySlotQuery.java
new file mode 100644
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+++ b/drivers/optical/src/main/java/org/onosproject/driver/optical/query/DefaultTributarySlotQuery.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.driver.optical.query;
+
+import org.onlab.util.GuavaCollectors;
+import org.onosproject.net.OduSignalType;
+import org.onosproject.net.OtuSignalType;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.TributarySlot;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.driver.AbstractHandlerBehaviour;
+import org.onosproject.net.optical.OchPort;
+import org.onosproject.net.optical.OtuPort;
+import org.onosproject.net.behaviour.TributarySlotQuery;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.onosproject.net.optical.device.OpticalDeviceServiceView.opticalView;
+
+import java.util.Collections;
+import java.util.Set;
+import java.util.stream.IntStream;
+
+/**
+ * TributarySlotQuery implementation which responds that all slots of ODU2 or ODU4 are available for the port.
+ */
+public class DefaultTributarySlotQuery extends AbstractHandlerBehaviour implements TributarySlotQuery {
+
+    private static final Logger log = LoggerFactory.getLogger(DefaultTributarySlotQuery.class);
+
+    private static final int TOTAL_ODU2_TRIBUTARY_SLOTS = 8;
+    private static final int TOTAL_ODU4_TRIBUTARY_SLOTS = 80;
+
+    private static Set<TributarySlot> getEntireOdu2TributarySlots() {
+        return IntStream.rangeClosed(1, TOTAL_ODU2_TRIBUTARY_SLOTS)
+                .mapToObj(TributarySlot::of)
+                .collect(GuavaCollectors.toImmutableSet());
+    }
+
+    private static Set<TributarySlot> getEntireOdu4TributarySlots() {
+        return IntStream.rangeClosed(1, TOTAL_ODU4_TRIBUTARY_SLOTS)
+                .mapToObj(TributarySlot::of)
+                .collect(GuavaCollectors.toImmutableSet());
+    }
+
+    private static final Set<TributarySlot> ENTIRE_ODU2_TRIBUTARY_SLOTS = getEntireOdu2TributarySlots();
+    private static final Set<TributarySlot> ENTIRE_ODU4_TRIBUTARY_SLOTS = getEntireOdu4TributarySlots();
+
+    @Override
+    public Set<TributarySlot> queryTributarySlots(PortNumber port) {
+        // currently return all slots by default.
+        DeviceService deviceService = opticalView(this.handler().get(DeviceService.class));
+        Port p = deviceService.getPort(this.data().deviceId(), port);
+
+        switch (p.type()) {
+            case OCH:
+                return queryOchTributarySlots(p);
+            case OTU:
+                return queryOtuTributarySlots(p);
+            default:
+                return Collections.emptySet();
+        }
+    }
+
+    private Set<TributarySlot> queryOchTributarySlots(Port ochPort) {
+        OduSignalType signalType = null;
+        if (ochPort instanceof org.onosproject.net.OchPort) {
+            // remove once deprecation of old OchPort model is done
+            signalType = ((org.onosproject.net.OchPort) ochPort).signalType();
+        }
+        if (ochPort instanceof OchPort) {
+            signalType = ((OchPort) ochPort).signalType();
+        }
+
+        if (signalType == null) {
+            log.warn("{} was not an OchPort", ochPort);
+            return Collections.emptySet();
+        }
+
+        switch (signalType) {
+            case ODU2:
+                return ENTIRE_ODU2_TRIBUTARY_SLOTS;
+            case ODU4:
+                return ENTIRE_ODU4_TRIBUTARY_SLOTS;
+            default:
+                log.error("Unsupported signal type {} for {}", signalType, ochPort);
+                return Collections.emptySet();
+        }
+    }
+
+    private Set<TributarySlot> queryOtuTributarySlots(Port otuPort) {
+        OtuSignalType signalType = null;
+        if (otuPort instanceof org.onosproject.net.OtuPort) {
+            // remove once deprecation of old OtuPort model is done
+            signalType = ((org.onosproject.net.OtuPort) otuPort).signalType();
+        }
+        if (otuPort instanceof OtuPort) {
+            signalType = ((OtuPort) otuPort).signalType();
+        }
+
+        if (signalType == null) {
+            log.warn("{} was not an OtuPort", otuPort);
+            return Collections.emptySet();
+        }
+
+        switch (signalType) {
+            case OTU2:
+                return ENTIRE_ODU2_TRIBUTARY_SLOTS;
+            case OTU4:
+                return ENTIRE_ODU4_TRIBUTARY_SLOTS;
+            default:
+                log.error("Unsupported signal type {} for {}", signalType, otuPort);
+                return Collections.emptySet();
+        }
+    }
+}
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