diff --git a/impl/src/main/java/org/opencord/olt/impl/OltMeterServiceInterface.java b/impl/src/main/java/org/opencord/olt/impl/OltMeterServiceInterface.java
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+++ b/impl/src/main/java/org/opencord/olt/impl/OltMeterServiceInterface.java
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+/*
+ * Copyright 2021-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.impl;
+
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.meter.MeterId;
+import org.opencord.sadis.SubscriberAndDeviceInformation;
+
+import java.util.Map;
+
+/**
+ * Interface for meter installation/removal methods
+ * for different types of bandwidth profiles.
+ */
+public interface OltMeterServiceInterface {
+    /**
+     * Checks for a meter, if not present it will create it and return false.
+     * @param deviceId DeviceId
+     * @param bandwidthProfile Bandwidth Profile Id
+     * @return boolean
+     */
+    boolean createMeter(DeviceId deviceId, String bandwidthProfile);
+
+    /**
+     * Checks for all the meters specified in the sadis uniTagList,
+     * if not present it will create them and return false.
+     * @param deviceId DeviceId
+     * @param si SubscriberAndDeviceInformation
+     * @return boolean
+     */
+    boolean createMeters(DeviceId deviceId, SubscriberAndDeviceInformation si);
+
+    /**
+     * Checks if a meter for the specified bandwidthProfile exists
+     * and is in ADDED state.
+     * @param deviceId DeviceId
+     * @param bandwidthProfileId bandwidth profile id
+     * @return true if present and in ADDED state
+     */
+    boolean hasMeterByBandwidthProfile(DeviceId deviceId, String bandwidthProfileId);
+
+    /**
+     * Checks if a meter for the specified bandwidthProfile exists
+     * and is in PENDING_ADD state.
+     * @param deviceId DeviceId
+     * @param bandwidthProfileId bandwidth profile id
+     * @return true if present and in PENDING_ADD state
+     */
+    boolean hasPendingMeterByBandwidthProfile(DeviceId deviceId, String bandwidthProfileId);
+
+    /**
+     * Creates a meter on a device for the given BandwidthProfile Id.
+     * @param deviceId the device id
+     * @param bandwidthProfileId the bandwidth profile Id
+     */
+    void createMeterForBp(DeviceId deviceId, String bandwidthProfileId);
+
+    /**
+     * Returns the meter Id for a given bandwidth profile Id.
+     * @param deviceId the device id
+     * @param bandwidthProfileId the bandwidth profile Id
+     * @return the meter Id
+     */
+    MeterId getMeterIdForBandwidthProfile(DeviceId deviceId, String bandwidthProfileId);
+
+    /**
+     * Purges all the meters on a device.
+     * @param deviceId the device
+     */
+    void purgeDeviceMeters(DeviceId deviceId);
+
+    /**
+     * Return all programmed meters for all OLTs controlled by this ONOS cluster.
+     * @return a map, with the device keys, and entry of map with bp Id and corresponding meter
+     */
+    Map<DeviceId, Map<String, MeterData>> getProgrammedMeters();
+
+}