diff --git a/app/src/main/java/org/opencord/olt/internalapi/AccessDeviceFlowService.java b/app/src/main/java/org/opencord/olt/internalapi/AccessDeviceFlowService.java
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+++ b/app/src/main/java/org/opencord/olt/internalapi/AccessDeviceFlowService.java
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+/*
+ * Copyright 2016-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.olt.internalapi;
+
+import org.onlab.packet.VlanId;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.flowobjective.ForwardingObjective;
+import org.onosproject.net.flowobjective.ObjectiveError;
+import org.onosproject.net.meter.MeterId;
+import org.opencord.sadis.UniTagInformation;
+
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Olt service for flow operations.
+ */
+public interface AccessDeviceFlowService {
+
+    /**
+     * Provisions or removes trap-to-controller DHCP packets.
+     *
+     * @param devId           the target device identifier
+     * @param port            the uni port for which this trap flow is designated
+     * @param upstreamMeterId the upstream meter id that includes the upstream
+     *                        bandwidth profile values such as PIR,CIR. If no meter id needs to be referenced,
+     *                        null can be sent
+     * @param tagInformation  the uni tag (ctag, stag) information
+     * @param install         true to install the flow, false to remove the flow
+     * @param upstream        true if trapped packets are flowing upstream towards
+     *                        server, false if packets are flowing downstream towards client
+     */
+    void processDhcpFilteringObjectives(DeviceId devId, PortNumber port,
+                                        MeterId upstreamMeterId,
+                                        UniTagInformation tagInformation,
+                                        boolean install,
+                                        boolean upstream);
+
+    /**
+     * Trap igmp packets to the controller.
+     *
+     * @param devId           Device identifier to send the flow
+     * @param port            Uni Port number
+     * @param upstreamMeterId upstream meter id that represents the upstream bandwidth profile
+     * @param tagInformation  the uni tag information of the subscriber
+     * @param install         the indicator to install or to remove the flow
+     * @param upstream        determines the direction of the flow
+     */
+    void processIgmpFilteringObjectives(DeviceId devId, PortNumber port,
+                                        MeterId upstreamMeterId,
+                                        UniTagInformation tagInformation,
+                                        boolean install,
+                                        boolean upstream);
+
+    /**
+     * Trap eapol authentication packets to the controller.
+     *
+     * @param devId        the device identifier
+     * @param portNumber   the port for which this trap flow is designated
+     * @param bpId         bandwidth profile id to add the related meter to the flow
+     * @param filterFuture completable future for this filtering objective operation
+     * @param vlanId       the default or customer tag for a subscriber
+     * @param install      true to install the flow, false to remove the flow
+     */
+    void processEapolFilteringObjectives(DeviceId devId, PortNumber portNumber, String bpId,
+                                         CompletableFuture<ObjectiveError> filterFuture,
+                                         VlanId vlanId, boolean install);
+
+    /**
+     * Trap lldp packets to the controller.
+     *
+     * @param devId   the device identifier
+     * @param port    the port for which this trap flow is designated
+     * @param install true to install the flow, false to remove the flow
+     */
+    void processLldpFilteringObjective(DeviceId devId, PortNumber port, boolean install);
+
+    /**
+     * Installs trap filtering objectives for particular traffic types (LLDP, IGMP and DHCP) on an
+     * NNI port.
+     *
+     * @param devId   device ID
+     * @param port    port number
+     * @param install true to install, false to remove
+     */
+    void processNniFilteringObjectives(DeviceId devId, PortNumber port, boolean install);
+
+    /**
+     * Creates a ForwardingObjective builder with double-tag match criteria and output
+     * action. The treatment will not contain pop or push actions.
+     * If the last parameter is true, use the upstream meter id and vice versa.
+     *
+     * @param uplinkPort      the nni port
+     * @param subscriberPort  the uni port
+     * @param meterId         the meter id that is assigned to upstream or downstream flows
+     * @param tagInfo         the uni tag information
+     * @param upstream        true to create upstream, false to create downstream builder
+     * @return ForwardingObjective.Builder
+     */
+    ForwardingObjective.Builder createTransparentBuilder(PortNumber uplinkPort,
+                                                         PortNumber subscriberPort,
+                                                         MeterId meterId,
+                                                         UniTagInformation tagInfo,
+                                                         boolean upstream);
+
+    /**
+     * Creates a ForwardingObjective builder for the upstream flows.
+     * The treatment will contain push action
+     *
+     * @param uplinkPort the nni port
+     * @param subscriberPort the uni port
+     * @param upstreamMeterId the meter id that is assigned to upstream flows
+     * @param uniTagInformation the uni tag information
+     * @return ForwardingObjective.Builder
+     */
+    ForwardingObjective.Builder createUpBuilder(PortNumber uplinkPort,
+                                                PortNumber subscriberPort,
+                                                MeterId upstreamMeterId,
+                                                UniTagInformation uniTagInformation);
+
+    /**
+     * Creates a ForwardingObjective builder for the downstream flows.
+     * The treatment will contain pop action
+     *
+     * @param uplinkPort the nni port
+     * @param subscriberPort the uni port
+     * @param downstreamMeterId the meter id that is assigned to downstream flows
+     * @param tagInformation the uni tag information
+     * @return ForwardingObjective.Builder
+     */
+    ForwardingObjective.Builder createDownBuilder(PortNumber uplinkPort,
+                                                  PortNumber subscriberPort,
+                                                  MeterId downstreamMeterId,
+                                                  UniTagInformation tagInformation);
+}