diff --git a/postservice/31-one-netmng b/postservice/31-one-netmng
index 4f366fa..4a2ef90 100755
--- a/postservice/31-one-netmng
+++ b/postservice/31-one-netmng
@@ -222,6 +222,7 @@ class OneNetworkL3(OneNetwork):
         fd, tmp_path = mkstemp(prefix='oneVnet-')
         template = open(tmp_path, 'w')
         template.write('NAME = "{0}"\n'.format(self.zone))
+        template.write('VN_MAD = ovswitch\n')
         if (update is False):
             if self.vnet_rg_start and self.vnet_rg_size:
                 template.write('AR=[\n')
@@ -262,6 +263,7 @@ class OneNetworkL2(OneNetwork):
         fd, tmp_path = mkstemp(prefix='oneVnet-')
         template = open(tmp_path, 'w')
         template.write('NAME = "{0}"\n'.format(self.zone))
+        template.write('VN_MAD = ovswitch\n')
 
         if self.tag:
             template.write('VLAN = yes\n')