Added port numbers to port labels. Still needs fine tuning, but good enough for the demo.
diff --git a/web/gui/src/main/webapp/onos.css b/web/gui/src/main/webapp/onos.css
index 15dd6b4..143f2b0 100644
--- a/web/gui/src/main/webapp/onos.css
+++ b/web/gui/src/main/webapp/onos.css
@@ -112,6 +112,14 @@
     fill: white;
 }
 
+svg g.portLayer text {
+    stroke: #888;
+    font-size: 8pt;
+    text-align: center;
+    font-weight: normal;
+    pointer-events: none;
+}
+
 svg .node.device rect {
     stroke-width: 1.5px;