diff --git a/mininet/node.py b/mininet/node.py
index 281839a..8749987 100644
--- a/mininet/node.py
+++ b/mininet/node.py
@@ -55,6 +55,7 @@
                            numCores, retry, mountCgroups, run )
 from mininet.moduledeps import moduleDeps, pathCheck, OVS_KMOD, OF_KMOD, TUN
 from mininet.link import Link, Intf, TCIntf
+import pdb
 
 class Node( object ):
     """A virtual network node is simply a shell in a network namespace.
@@ -728,6 +729,7 @@
 
         self.cmd("export CCND_DEBUG=6")
         self.cmd("export CCND_LOG=./log.{0}".format(self.name))
+	#pdb.set_trace()
 #	print self.params['cache']
 	if self.params['cache'] != None:
 		self.cmd("export CCND_CAP={0}".format(self.params['cache']))