diff --git a/oslo_policy/policy.py b/oslo_policy/policy.py
index ea2ab537..9ca53768 100644
--- a/oslo_policy/policy.py
+++ b/oslo_policy/policy.py
@@ -556,6 +556,10 @@ class Enforcer(object):
         self.suppress_default_change_warnings = False
         # FOR TESTING ONLY
         self.suppress_deprecation_warnings = False
+        # NOTE(tkajinam): Some components(eg. neutron-lib) build their own
+        # enforcers to check only partial rules with the full policy rules, and
+        # this sometimes causes a lot of undefined warnings
+        self.skip_undefined_check = False
 
     def set_rules(self, rules, overwrite=True, use_conf=False):
         """Create a new :class:`Rules` based on the provided dict of rules.
@@ -693,7 +697,7 @@ class Enforcer(object):
         cyclic_checks = []
         violation = False
         for name, check in self.rules.items():
-            if self._undefined_check(check):
+            if not self.skip_undefined_check and self._undefined_check(check):
                 undefined_checks.append(name)
                 violation = True
             if self._cycle_check(check):
diff --git a/oslo_policy/tests/test_policy.py b/oslo_policy/tests/test_policy.py
index fdcdbca1..0d8858ea 100644
--- a/oslo_policy/tests/test_policy.py
+++ b/oslo_policy/tests/test_policy.py
@@ -1948,6 +1948,18 @@ class EnforcerCheckRulesTest(base.PolicyBaseTestCase):
         self.assertFalse(self.enforcer.check_rules())
         mock_log.warning.assert_called()
 
+    @mock.patch.object(policy, 'LOG')
+    def test_undefined_rule_skipped(self, mock_log):
+        rules = jsonutils.dumps({'foo': 'rule:bar'})
+        self.create_config_file('policy.json', rules)
+        self.enforcer.skip_undefined_check = True
+        self.enforcer.load_rules(True)
+
+        self.assertTrue(self.enforcer.check_rules())
+        # TODO(tkajinam): This fails because of warnings caused by JSON format
+        # policy file used
+        # mock_log.warning.assert_not_called()
+
     @mock.patch.object(policy, 'LOG')
     def test_undefined_rule_raises(self, mock_log):
         rules = jsonutils.dumps({'foo': 'rule:bar'})
@@ -1958,6 +1970,18 @@ class EnforcerCheckRulesTest(base.PolicyBaseTestCase):
                           self.enforcer.check_rules, raise_on_violation=True)
         mock_log.warning.assert_called()
 
+    @mock.patch.object(policy, 'LOG')
+    def test_undefined_rule_raises_skipped(self, mock_log):
+        rules = jsonutils.dumps({'foo': 'rule:bar'})
+        self.create_config_file('policy.json', rules)
+        self.enforcer.skip_undefined_check = True
+        self.enforcer.load_rules(True)
+
+        self.assertTrue(self.enforcer.check_rules(raise_on_violation=True))
+        # TODO(tkajinam): This fails because of warnings caused by JSON format
+        # policy file used
+        # mock_log.warning.assert_not_called()
+
     @mock.patch.object(policy, 'LOG')
     def test_cyclical_rules(self, mock_log):
         rules = jsonutils.dumps({'foo': 'rule:bar', 'bar': 'rule:foo'})