diff --git a/gestion/hptools.py b/gestion/hptools.py
index b09e7f99..7c8e8c1c 100755
--- a/gestion/hptools.py
+++ b/gestion/hptools.py
@@ -182,20 +182,25 @@ class snmp :
         """
         return self.__exec('snmpset -O vq %s %s %s %s' % (self.options, oid, typ, val ) )
 
-    def walk(self,base_oid, bin_comp=False) :
+    def walk(self,base_oid, bin_comp=False, output='x'):
         """ Retourne le résultat de snmpwalk
         le retour est un dictionnaire { oid : valeur }
         """
         if bin_comp:
             return snmp.bin_walk(self, base_oid)
-        lignes = self.__exec('snmpwalk -Ox %s %s' % (self.options, base_oid ) ).split('\n')
+        if output not in list('abeEfnqQsStTuUvxX'):
+            output = 'q'
+        lignes = self.__exec('snmpwalk -O%s %s %s' % (output, self.options, base_oid ) ).split('\n')
         result = {}
         for ligne in lignes:
             try:
                 oid, valeur = ligne.split('Hex-STRING: ')
-                result[oid] = valeur
-            except:
-                pass
+            except ValueError:
+                try:
+                    oid, valeur = ligne.split(' ', 1)
+                except ValueError:
+                    continue
+            result[oid] = valeur
         return result
 
     def bin_walk(self, base_oid):