diff --git a/octavia_tempest_plugin/tests/test_base.py b/octavia_tempest_plugin/tests/test_base.py
index 19b827c..6b01a3e 100644
--- a/octavia_tempest_plugin/tests/test_base.py
+++ b/octavia_tempest_plugin/tests/test_base.py
@@ -13,6 +13,7 @@
 #    under the License.
 
 import ipaddress
+import netaddr
 import os
 import random
 import re
@@ -380,12 +381,20 @@
             cls.lb_mem_net_client.show_network,
             cls.lb_member_vip_net['id'])
 
+        # Add allocation pool to prevent IP address conflicts with portprober
+        cidr = netaddr.IPNetwork(CONF.load_balancer.vip_subnet_cidr)
+        pool_start = ipaddress.ip_address(str(cidr[101]))
+        pool_end = ipaddress.ip_address(str(cidr[254]))
+        allocation_pools = [{'start': str(pool_start), 'end': str(pool_end)}]
+
         # Create tenant VIP subnet
         subnet_kwargs = {
             'name': data_utils.rand_name("lb_member_vip_subnet"),
             'network_id': cls.lb_member_vip_net['id'],
             'cidr': CONF.load_balancer.vip_subnet_cidr,
-            'ip_version': 4}
+            'ip_version': 4,
+            'allocation_pools': allocation_pools
+        }
         result = cls.lb_mem_subnet_client.create_subnet(**subnet_kwargs)
         cls.lb_member_vip_subnet = result['subnet']
         LOG.info('lb_member_vip_subnet: {}'.format(cls.lb_member_vip_subnet))