diff --git a/web/gui/src/main/webapp/app/view/topo2/topo2LinkLabel.js b/web/gui/src/main/webapp/app/view/topo2/topo2LinkLabel.js
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+++ b/web/gui/src/main/webapp/app/view/topo2/topo2LinkLabel.js
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+/*
+ * 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 -- Topo2LinkLabel
+ A label positioned at the center point of a link
+ usage: new LinkLabel({text, icon}, DOM Element, Link);
+ */
+
+(function () {
+
+    angular.module('ovTopo2')
+        .factory('Topo2LinkLabel', [
+            'Topo2Label', 'Topo2ZoomService',
+            function (Label, t2zs) {
+                return Label.extend({
+                    className: 'topo2-linklabel',
+                    maxHeight: 30,
+                    minHeight: 20,
+                    setPosition: function () {
+                        var link = this.options.link;
+                        this.set({
+                            x: (link.source.x + link.target.x) / 2,
+                            y: (link.source.y + link.target.y) / 2
+                        });
+                    },
+                    setScale: function () {
+                        this.content.style('transform',
+                            'scale(' + t2zs.adjustmentScale(20, 30) + ')');
+                    }
+                });
+            }
+        ]);
+})();