diff --git a/web/gui/src/main/webapp/app/view/topo2/topo2Mastership.js b/web/gui/src/main/webapp/app/view/topo2/topo2Mastership.js
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+++ b/web/gui/src/main/webapp/app/view/topo2/topo2Mastership.js
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2017-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.
+ */
+
+/*
+ ONOS GUI -- Topology Mastership controller.
+ Controller that handles the state of the selected mastership
+ */
+
+(function () {
+
+    var instance;
+
+    angular.module('ovTopo2')
+        .factory('Topo2MastershipService', [
+
+            function () {
+
+                var MastershipController = function () {
+                    instance = this;
+                    this.region = null;
+                    this.currentMastership = null;
+                };
+
+                MastershipController.prototype = {
+                    displayMastership: function () {
+                        var nodes = this.region.regionNodes(),
+                            links = this.region.regionLinks();
+
+                        _.each(nodes.concat(links), function (n) {
+                            n.displayMastership(this.currentMastership);
+                        });
+                    },
+                    mastership: function () {
+                        return this.currentMastership;
+                    },
+                    setMastership: function (id) {
+                        this.currentMastership = id;
+                        this.displayMastership();
+                    }
+                }
+
+                return instance || new MastershipController();
+            }
+        ]);
+})();
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