diff --git a/neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py b/neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py
index 6bf1e05d23..e974ef2dc2 100755
--- a/neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py
+++ b/neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py
@@ -564,7 +564,7 @@ class LinuxBridgeManager:
         return (agent_ip in entries and mac in entries)
 
     def add_fdb_ip_entry(self, mac, ip, interface):
-        utils.execute(['ip', 'neigh', 'add', ip, 'lladdr', mac,
+        utils.execute(['ip', 'neigh', 'replace', ip, 'lladdr', mac,
                        'dev', interface, 'nud', 'permanent'],
                       root_helper=self.root_helper,
                       check_exit_code=False)
diff --git a/neutron/tests/unit/linuxbridge/test_lb_neutron_agent.py b/neutron/tests/unit/linuxbridge/test_lb_neutron_agent.py
index 0687d023ec..629ab338cf 100644
--- a/neutron/tests/unit/linuxbridge/test_lb_neutron_agent.py
+++ b/neutron/tests/unit/linuxbridge/test_lb_neutron_agent.py
@@ -863,7 +863,7 @@ class TestLinuxBridgeRpcCallbacks(base.BaseTestCase):
                            'dev', 'vxlan-1', 'dst', 'agent_ip'],
                           root_helper=self.root_helper,
                           check_exit_code=False),
-                mock.call(['ip', 'neigh', 'add', 'port_ip', 'lladdr',
+                mock.call(['ip', 'neigh', 'replace', 'port_ip', 'lladdr',
                            'port_mac', 'dev', 'vxlan-1', 'nud', 'permanent'],
                           root_helper=self.root_helper,
                           check_exit_code=False),
@@ -944,7 +944,7 @@ class TestLinuxBridgeRpcCallbacks(base.BaseTestCase):
             self.lb_rpc.fdb_update(None, fdb_entries)
 
             expected = [
-                mock.call(['ip', 'neigh', 'add', 'port_ip_2', 'lladdr',
+                mock.call(['ip', 'neigh', 'replace', 'port_ip_2', 'lladdr',
                            'port_mac', 'dev', 'vxlan-1', 'nud', 'permanent'],
                           root_helper=self.root_helper,
                           check_exit_code=False),