diff --git a/src/main/java/net/onrc/onos/intent/runtime/PathCalcRuntimeModule.java b/src/main/java/net/onrc/onos/intent/runtime/PathCalcRuntimeModule.java
index 45043fe..c5fc660 100755
--- a/src/main/java/net/onrc/onos/intent/runtime/PathCalcRuntimeModule.java
+++ b/src/main/java/net/onrc/onos/intent/runtime/PathCalcRuntimeModule.java
@@ -100,8 +100,10 @@
 		IntentOperationList reroutingOperation = new IntentOperationList();
 		for (Intent intent : oldPaths) {
 			PathIntent pathIntent = (PathIntent) intent;
+			if (pathIntent.getId().startsWith("1:F")) // XXX: demo special, the intent start with "F" is skipped
+				continue;
 			if (pathIntent.getState().equals(IntentState.INST_ACK) && // XXX: path intents in flight
-					!reroutingOperation.contains(pathIntent.getParentIntent())) { 
+					!reroutingOperation.contains(pathIntent.getParentIntent())) {
 				reroutingOperation.add(Operator.ADD, pathIntent.getParentIntent());
 			}
 		}
@@ -265,7 +267,7 @@
 
 		PerfLogger p = new PerfLogger("networkGraphEvents");
 		HashSet<Intent> affectedPaths = new HashSet<>();
-		
+
 		boolean rerouteAll = false;
 		for(LinkEvent le : addedLinkEvents) {
 		    LinkEvent rev = new LinkEvent(le.getDst().getDpid(), le.getDst().getNumber(), le.getSrc().getDpid(), le.getSrc().getNumber());
diff --git a/web/rest-intent/intent-installer.rb b/web/rest-intent/intent-installer.rb
index b2d21d8..41361be 100755
--- a/web/rest-intent/intent-installer.rb
+++ b/web/rest-intent/intent-installer.rb
@@ -72,6 +72,9 @@
   opts.on('b', '--bulk_limit bulk_limit', 'bulk request upto this limit') do |bulk_limit|
     options[:bulk_limit] = bulk_limit
   end
+  opts.on('f', '--freeze_intents', 'freeze dont reroute intents') do
+    options[:freeze] = "F"
+  end
   opts.on('-h', '--help', 'Display help') do
     puts opts
     exit
@@ -173,13 +176,15 @@
     @port ||= 8080
     @bulk_limit = options[:bulk_limit]
     @bulk_limit ||= 10000
+    @freeze = options[:freeze]
+    @freeze ||= ""
   end
 
 
   def _create_intent json_intents
     (0...@max_switches).each do |idx|
       intent = {
-        :intent_id => "#{@intent_id}",
+        :intent_id => "#{@freeze}#{@intent_id}",
         :intent_type => @intent_type,
         :intent_op => @intent_op,
         :srcSwitch => "258".to_s,