diff --git a/neutron_tempest_plugin/config.py b/neutron_tempest_plugin/config.py
index f300b50..4f51d3b 100644
--- a/neutron_tempest_plugin/config.py
+++ b/neutron_tempest_plugin/config.py
@@ -181,6 +181,10 @@
                default=None,
                help=("IP Address/Mask, which will be used to "
                      "test the l3vpn connectivity.")),
+    cfg.StrOpt('l3vpn_subnet_cidr',
+               default="192.168.0.254/24",
+               help=("IP Address/Mask, which will be used as private network"
+                     "test the l3vpn connectivity.")),
     cfg.StrOpt('l2vpn_endpoint',
                default=None,
                help=("IP Address/Mask, which will be used to "