diff --git a/neutron/tests/common/exclusive_resources/ip_address.py b/neutron/tests/common/exclusive_resources/ip_address.py
index c74b9d987d7..8935c7888ad 100644
--- a/neutron/tests/common/exclusive_resources/ip_address.py
+++ b/neutron/tests/common/exclusive_resources/ip_address.py
@@ -19,6 +19,27 @@ import netaddr
 
 from neutron.tests.common.exclusive_resources import resource_allocator
 
+TEST_NET_RANGE = {
+    1: ('192.0.2.1', '192.0.2.254'),
+    2: ('198.51.100.1', '198.51.100.254'),
+    3: ('203.0.113.1', '203.0.113.254'),
+}
+
+
+def get_test_net_address_fixture(test_net_number):
+    """Return exclusive ip address on the system based on RFC 5737.
+
+    :param block: One of following constants: 1, 2, 3
+
+    https://tools.ietf.org/html/rfc5737
+    """
+    try:
+        net_range = TEST_NET_RANGE[test_net_number]
+    except KeyError:
+        raise ValueError("Unknown constant for TEST-NET: %d" % test_net_number)
+
+    return ExclusiveIPAddress(*net_range)
+
 
 def get_random_ip(low, high):
     parent_range = netaddr.IPRange(low, high)
diff --git a/neutron/tests/functional/agent/linux/base.py b/neutron/tests/functional/agent/linux/base.py
index 36baa9b564c..9b520a52366 100644
--- a/neutron/tests/functional/agent/linux/base.py
+++ b/neutron/tests/functional/agent/linux/base.py
@@ -14,6 +14,7 @@
 
 import testscenarios
 
+from neutron.tests.common.exclusive_resources import ip_address
 from neutron.tests.functional import base
 
 
@@ -37,3 +38,11 @@ class BaseOVSLinuxTestCase(testscenarios.WithScenarios, base.BaseSudoTestCase):
     def setUp(self):
         super(BaseOVSLinuxTestCase, self).setUp()
         self.config(group='OVS', ovsdb_interface=self.ovsdb_interface)
+
+    def get_test_net_address(self, block):
+        """Return exclusive address based on RFC 5737.
+
+        :param block: One of constants 1, 2 or 3
+        """
+        return str(self.useFixture(
+            ip_address.get_test_net_address_fixture(block)).address)
diff --git a/neutron/tests/functional/agent/test_ovs_flows.py b/neutron/tests/functional/agent/test_ovs_flows.py
index c4cd8b993bb..5e0161f5248 100644
--- a/neutron/tests/functional/agent/test_ovs_flows.py
+++ b/neutron/tests/functional/agent/test_ovs_flows.py
@@ -428,8 +428,8 @@ class OVSFlowTestCase(OVSAgentTestBase):
     @helpers.skip_if_ovs_older_than("2.5.1")
     def test_install_flood_to_tun(self):
         attrs = {
-            'remote_ip': '192.0.2.1',  # RFC 5737 TEST-NET-1
-            'local_ip': '198.51.100.1',  # RFC 5737 TEST-NET-2
+            'remote_ip': self.get_test_net_address(1),
+            'local_ip': self.get_test_net_address(2),
         }
         kwargs = {'vlan': 777, 'tun_id': 888}
         port_name = common_utils.get_rand_device_name(net_helpers.PORT_PREFIX)
diff --git a/neutron/tests/functional/agent/test_ovs_lib.py b/neutron/tests/functional/agent/test_ovs_lib.py
index 32df6964596..b5a32684cc4 100644
--- a/neutron/tests/functional/agent/test_ovs_lib.py
+++ b/neutron/tests/functional/agent/test_ovs_lib.py
@@ -206,8 +206,8 @@ class OVSBridgeTestCase(OVSBridgeTestBase):
 
     def test_add_tunnel_port_ipv4(self):
         attrs = {
-            'remote_ip': '192.0.2.1',  # RFC 5737 TEST-NET-1
-            'local_ip': '198.51.100.1',  # RFC 5737 TEST-NET-2
+            'remote_ip': self.get_test_net_address(1),
+            'local_ip': self.get_test_net_address(2),
         }
         self._test_add_tunnel_port(attrs)