diff --git a/api/serializers.py b/api/serializers.py
index f5fd1fa2..94144b40 100644
--- a/api/serializers.py
+++ b/api/serializers.py
@@ -349,6 +349,7 @@ class OptionalMachineSerializer(NamespacedHMSerializer):
 class OptionalTopologieSerializer(NamespacedHMSerializer):
     """Serialize `preferences.models.OptionalTopologie` objects.
     """
+    switchs_management_interface_ip = serializers.CharField()
 
     class Meta:
         model = preferences.OptionalTopologie
diff --git a/topologie/models.py b/topologie/models.py
index 840d9c70..d02fce40 100644
--- a/topologie/models.py
+++ b/topologie/models.py
@@ -552,7 +552,7 @@ class Port(AclMixin, RevMixin, models.Model):
                 return port_profile
             else:
                 nothing_profile, _created = PortProfile.objects.get_or_create(
-                    profile_default='nothing',
+                    profil_default='nothing',
                     name='nothing',
                     radius_type='NO'
                 )