diff --git a/src/mpECMPSingleInterfaceTopo.py b/src/mpECMPSingleInterfaceTopo.py
index 105f7e6..9acb60d 100644
--- a/src/mpECMPSingleInterfaceTopo.py
+++ b/src/mpECMPSingleInterfaceTopo.py
@@ -26,22 +26,19 @@ class MpECMPSingleInterfaceTopo(MpTopo):
 				str(link.id))
 
 	def __str__(self):
-		s = "Single if ECMP like env"
-		"""
+		s = "Single if ECMP like env\n"
 		i = 0
 		n = len(self.topoParam.linkCharacteristics)
 		for p in self.topoParam.linkCharacteristics:
 			if i == n // 2:
 				if n % 2 == 0:
-					s = s + "c            r-----s\n"
-					s = s + "|-----sw-----|\n"
+					s = s + "c---sw          sw-----s\n"
+					s = s + "    |-----R-----|\n"
 				else:
-					s = s + "c-----sw-----r-----s\n"
+					s = s + "c---sw----R-----sw-----s\n"
 			else:
-				s = s + "|-----sw-----|\n"
+				s = s + "    |-----R-----|\n"
 
 			i = i + 1
-		"""
-
 		return s
 
diff --git a/src/mpTopo.py b/src/mpTopo.py
index f7d5b83..4b65081 100644
--- a/src/mpTopo.py
+++ b/src/mpTopo.py
@@ -8,13 +8,16 @@ class MpTopo:
 	clientName = "Client"
 	serverName = "Server"
 	routerName = "Router"
+	cmdLog = "command.log"
 
 	"""Simple MpTopo"""
 	def __init__(self, topoBuilder, topoParam):
 		self.topoBuilder = topoBuilder
 		self.topoParam = topoParam
+		self.logFile = open(MpTopo.cmdLog, 'w')
 	
 	def commandTo(self, who, cmd):
+		self.logFile.write(who.__str__() + " : " + cmd + "\n")
 		self.topoBuilder.commandTo(who, cmd)
 
 	def getHost(self, who):
@@ -34,6 +37,9 @@ class MpTopo:
 
 	def startNetwork(self):
 		self.topoBuilder.startNetwork()
+	
+	def closeLogFile(self):
+		self.logFile.close()
 
 	def stopNetwork(self):
 		self.topoBuilder.stopNetwork()