diff --git a/snmp/bat.sh b/snmp/bat.sh
index 3b1c3291..67fcfbc7 100755
--- a/snmp/bat.sh
+++ b/snmp/bat.sh
@@ -14,55 +14,40 @@ MIBFILE=/usr/scripts/snmp/Des5200.mib
 
 test -f $MIBFILE || exit 0
 
+GETVALUES() {
+	snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifOutOctets.$2 | awk '{print $4}'
+	snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifInOctets.$2 | awk '{print $4}'
+	echo ""
+	echo "$1"
+}
+
 case "$1" in
 	bata)
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifOutOctets.6 | awk '{print $4}'
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifInOctets.6 | awk '{print $4}'
-		echo ""
-		echo "bata"
+		GETVALUES $1 6
 		;;
 	batb)
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifOutOctets.4 | awk '{print $4}'
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifInOctets.4 | awk '{print $4}'
-		echo ""
-		echo "batb"
+		GETVALUES $1 4
 		;;
 	batc)
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifOutOctets.14 | awk '{print $4}'
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifInOctets.14 | awk '{print $4}'
-		echo ""
-		echo "batc"
+		GETVALUES $1 14
 		;;
 	batf)
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifOutOctets.7 | awk '{print $4}'
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifInOctets.7 | awk '{print $4}'
-		echo ""
-		echo "batf"
+		GETVALUES $1 7
 		;;
 	batg)
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifOutOctets.13 | awk '{print $4}'
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifInOctets.13 | awk '{print $4}'
-		echo ""
-		echo "batg"
+		GETVALUES $1 13
 		;;
 	batj)
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifOutOctets.15 | awk '{print $4}'
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifInOctets.15 | awk '{print $4}'
-		echo ""
-		echo "batj"
+		GETVALUES $1 15
 		;;
 	batm)
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifOutOctets.16 | awk '{print $4}'
-		snmpget -m $MIBFILE $HOSTNAME $COMMUNITY interfaces.ifTable.ifEntry.ifInOctets.16 | awk '{print $4}'
-		echo ""
-		echo "batm"
+		GETVALUES $1 16
 		;;
 	   *)
 	        echo "Monitoring du switch backbone par snmp. Voir /etc/mrtg.cfg"
 		echo "Usage : /usr/scripts/snmp/bat.sh bata|batb|batc|batf|batg|batj|batm">&2
 		exit 1
 		;;
-					   
 
 esac