diff --git a/app/src/main/java/org/opencord/olttopology/impl/OsgiPropertyConstants.java b/app/src/main/java/org/opencord/olttopology/impl/OsgiPropertyConstants.java
new file mode 100644
index 0000000..c05d219
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+++ b/app/src/main/java/org/opencord/olttopology/impl/OsgiPropertyConstants.java
@@ -0,0 +1,38 @@
+/*
+ * 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.opencord.olttopology.impl;
+
+/**
+ * Constants for default values of configurable properties.
+ */
+public final class OsgiPropertyConstants {
+    public static final String DEFAULT_DEST_MAC_ADDRESS = "destMacAddress";
+    // Destination Mac address where LLDP packet has to be sent.
+    public static final String DEFAULT_DEST_MAC_ADDRESS_DEFAULT = "01:80:c2:00:00:00";
+    public static final String DEFAULT_TTL_IN_SECS = "ttlInSecs";
+    // Default Time To Live value to be used in the LLDP packets sent out
+    public static final int DEFAULT_TTL_IN_SECS_DEFAULT = 120;
+    public static final String DEFAULT_CHASSIS_ID = "chassisId";
+    // Default ChassisId to be used in the LLDP packets sent out
+    public static final int DEFAULT_CHASSIS_ID_DEFAULT = 0;
+    // Default periodicity (in minutes) of sending the LLDP messages through OLT NNI Ports
+    public static final int DEFAULT_LLDP_SEND_PERIODICITY = 15;
+    public static final String LLDP_SEND_PERIODICITY_STR = "lldpSendPeriodicity";
+
+    private OsgiPropertyConstants() {
+    }
+}