diff --git a/openair-cn/SCRIPTS/start_lte-enb-ovs.bash b/openair-cn/SCRIPTS/start_lte-enb-ovs.bash
index b93d4e91ce4e9c2c529f4820ab275f3335587e3a..4e6b3cacea6ec06ff5665f520c2b2b397ba1e3d8 100755
--- a/openair-cn/SCRIPTS/start_lte-enb-ovs.bash
+++ b/openair-cn/SCRIPTS/start_lte-enb-ovs.bash
@@ -144,7 +144,11 @@ fi
 ip rule add fwmark 5 table lte
 ip route add default dev $LTEIF table lte
 
+ITTI_LOG_FILE=/tmp/itti_enb.log
+rotate_log_file $ITTI_LOG_FILE
+
+
 #gdb --args
-$OPENAIR_TARGETS/SIMU/USER/oaisim -a -u1 -l7 -O $MME_IP_ADDRESS_FOR_S1_MME
+$OPENAIR_TARGETS/SIMU/USER/oaisim -a -u1 -l7 -K $ITTI_LOG_FILE -O $MME_IP_ADDRESS_FOR_S1_MME
 
 
diff --git a/openair-cn/SCRIPTS/start_lte-epc-ovs.bash b/openair-cn/SCRIPTS/start_lte-epc-ovs.bash
index 0660b3640a0cf17645ec799a2aea14e4da80c10d..7714660f2a72c46d794aec4ad0488d3d326abe56 100755
--- a/openair-cn/SCRIPTS/start_lte-epc-ovs.bash
+++ b/openair-cn/SCRIPTS/start_lte-epc-ovs.bash
@@ -161,4 +161,8 @@ else
     fi
 fi
 cd $OPENAIRCN_DIR/$OBJ_DIR
-$OPENAIRCN_DIR/$OBJ_DIR/OAI_EPC/oai_epc -c $MME_CONFIG_FILE
+
+ITTI_LOG_FILE=/tmp/itti_mme.log
+rotate_log_file $ITTI_LOG_FILE
+
+$OPENAIRCN_DIR/$OBJ_DIR/OAI_EPC/oai_epc -K $ITTI_LOG_FILE -c $MME_CONFIG_FILE
diff --git a/openair-cn/SCRIPTS/utils.bash b/openair-cn/SCRIPTS/utils.bash
index d567326d751a0122136fbe7f773978e294f2c089..97222be1f16000e9a564e2b39507679e79064648 100755
--- a/openair-cn/SCRIPTS/utils.bash
+++ b/openair-cn/SCRIPTS/utils.bash
@@ -122,6 +122,15 @@ extract() {
     return 0
 }
 
+rotate_log_file () {
+    if [ -f $1 ]; then
+        TIMESTAMP=`date +%Y-%m-%d.%Hh_%Mm_%Ss`
+        NEWLOGFILE=$1.$TIMESTAMP
+        mv $1 $NEWLOGFILE
+        cat /dev/null > $1
+        nohup gzip -f -9 $NEWLOGFILE &
+    fi
+}
 
 set_openair() {
     path=`pwd`
@@ -339,11 +348,11 @@ build_openvswitch_network() {
     #        |           |cpenb0+------------------+cpmme0|           |    +------+   |          |
     #        |           +------+   |bridge|       +------+           +----+      +---+          |
     #        |           |upenb0+-------+  |              |           |               +----------+
-    #        +-----------+------+   |   |  |              +-+-------+-+
-    #                               |   |  +----------------| s11mme|---+
-    #                               |   |                   +---+---+   |
-    #                               |   |             (optional)|       |
-    #                               |   |                   +---+---+   |
+    #        |           +------+   |   |  |              +-+-------+-+
+    #        |           |          |   |  +----------------| s11mme|---+
+    #        |           |          |   |                   +---+---+   |
+    #        |           |          |   |             (optional)|       |
+    #        +-----------+          |   |                   +---+---+   |
     #                               +---|------------------ | s11sgw|---+        router.eur
     #                                   |                 +-+-------+-+              |   +--------------+
     #                                   |                 |  S+P-GW   |              v   |   ROUTER     |
@@ -423,6 +432,7 @@ test_openvswitch_network() {
         echo_success "NETWORK TEST SUCCESS (openvswitch) between MME and S-GW S11"
     fi
     pkill iperf 2>&1 > /dev/null
+    return 0
 }
 
 build_epc_network() {