diff --git a/apps/t3/app/src/main/java/org/onosproject/t3/api/NetworkConfigNib.java b/apps/t3/app/src/main/java/org/onosproject/t3/api/NetworkConfigNib.java
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+++ b/apps/t3/app/src/main/java/org/onosproject/t3/api/NetworkConfigNib.java
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+/*
+ * Copyright 2020-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.t3.api;
+
+import com.google.common.collect.ImmutableMap;
+import org.onosproject.net.config.Config;
+import org.onosproject.net.config.basics.InterfaceConfig;
+import org.onosproject.segmentrouting.config.SegmentRoutingDeviceConfig;
+import org.slf4j.Logger;
+
+import java.util.Map;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Represents Network Information Base (NIB) for network configurations
+ * and supports alternative functions to
+ * {@link org.onosproject.net.config.NetworkConfigService} for offline data.
+ */
+public class NetworkConfigNib {
+
+    private static final Logger log = getLogger(NetworkConfigNib.class);
+
+    // Map of str ConnectPoint : InterfaceConfig
+    private Map<String, Config> portConfigMap;
+    // Map of str DeviceId : SegmentRoutingDeviceConfig
+    private Map<String, Config> deviceConfigMap;
+
+    // use the singleton helper to create the instance
+    protected NetworkConfigNib() {
+    }
+
+    /**
+     * Sets a map of port : configuration to the port.
+     *
+     * @param portConfigMap port-config map
+     */
+    public void setPortConfigMap(Map<String, Config> portConfigMap) {
+         this.portConfigMap = portConfigMap;
+    }
+
+    /**
+     * Sets a map of device : configuration to the device.
+     *
+     * @param deviceConfigMap device-config map
+     */
+    public void setDeviceConfigMap(Map<String, Config> deviceConfigMap) {
+        this.deviceConfigMap = deviceConfigMap;
+    }
+
+    /**
+     * Returns the port-config map.
+     *
+     * @return port-config map
+     */
+    public Map<Object, Object> getPortConfigMap() {
+        return ImmutableMap.copyOf(portConfigMap);
+    }
+
+    /**
+     * Returns the device-config map.
+     *
+     * @return device-config map
+     */
+    public Map<Object, Object> getDeviceConfigMap() {
+        return ImmutableMap.copyOf(deviceConfigMap);
+    }
+
+    /**
+     * Returns the configuration for the specified subject and configuration
+     * class if one is available; null otherwise.
+     *
+     * @param subject     configuration subject
+     * @param configClass configuration class
+     * @param <S>         type of subject
+     * @param <C>         type of configuration
+     * @return configuration or null if one is not available
+     */
+    public <S, C extends Config<S>> C getConfig(S subject, Class<C> configClass) {
+        if (configClass.equals(InterfaceConfig.class)) {
+            return (C) portConfigMap.get(subject.toString());
+        } else if (configClass.equals(SegmentRoutingDeviceConfig.class)) {
+            return (C) deviceConfigMap.get(subject.toString());
+        } else {
+            log.warn("Given configuration {} is not supported", configClass.toString());
+            return null;
+        }
+    }
+
+    /**
+     * Returns the singleton instance of multicast routes NIB.
+     *
+     * @return instance of multicast routes NIB
+     */
+    public static NetworkConfigNib getInstance() {
+        return NetworkConfigNib.SingletonHelper.INSTANCE;
+    }
+
+    private static class SingletonHelper {
+        private static final NetworkConfigNib INSTANCE = new NetworkConfigNib();
+    }
+
+}