diff --git a/keystone_tempest_plugin/config.py b/keystone_tempest_plugin/config.py
index 87872c5..d3e3c02 100644
--- a/keystone_tempest_plugin/config.py
+++ b/keystone_tempest_plugin/config.py
@@ -20,6 +20,11 @@
                 default=False,
                 help='Does the environment support the Federated Identity '
                      'feature?'),
+    cfg.BoolOpt('external_idp',
+                default=True,
+                help='Whether to test federated scenarios against an external '
+                     'identity provider. If disabled, only '
+                     'Keystone-to-Keystone tests will be enabled.'),
 ]
 
 fed_scenario_group = cfg.OptGroup(name='fed_scenario',