From 63ae13fcf95a3e66357ef1671e77030681d44321 Mon Sep 17 00:00:00 2001
From: Bob Lantz <rlantz@cs.stanford.edu>
Date: Tue, 12 May 2015 23:50:37 -0700
Subject: [PATCH] Fix #520

---
 mininet/node.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mininet/node.py b/mininet/node.py
index 544fae3..b00d508 100644
--- a/mininet/node.py
+++ b/mininet/node.py
@@ -1143,7 +1143,7 @@ class OVSSwitch( Switch ):
         if self.protocols and not self.isOldOVS():
             opts += ' protocols=%s' % self.protocols
         if self.stp and self.failMode == 'standalone':
-            opts += ' stp_enable=true' % self
+            opts += ' stp_enable=true'
         return opts
 
     def start( self, controllers ):