diff --git a/neutron/agent/linux/ip_lib.py b/neutron/agent/linux/ip_lib.py
index c040362fd4..40acb4c184 100644
--- a/neutron/agent/linux/ip_lib.py
+++ b/neutron/agent/linux/ip_lib.py
@@ -444,7 +444,7 @@ class IpNeighCommand(IpDeviceCommandBase):
     COMMAND = 'neigh'
 
     def add(self, ip_version, ip_address, mac_address):
-        self._as_root('add',
+        self._as_root('replace',
                       ip_address,
                       'lladdr',
                       mac_address,
diff --git a/neutron/tests/unit/test_linux_ip_lib.py b/neutron/tests/unit/test_linux_ip_lib.py
index 59fe4223c8..f8f4d54a24 100644
--- a/neutron/tests/unit/test_linux_ip_lib.py
+++ b/neutron/tests/unit/test_linux_ip_lib.py
@@ -810,7 +810,7 @@ class TestIpNeighCommand(TestIPCmdBase):
 
     def test_add_entry(self):
         self.neigh_cmd.add(4, '192.168.45.100', 'cc:dd:ee:ff:ab:cd')
-        self._assert_sudo([4], ('add', '192.168.45.100', 'lladdr',
+        self._assert_sudo([4], ('replace', '192.168.45.100', 'lladdr',
                                 'cc:dd:ee:ff:ab:cd', 'nud', 'permanent',
                                 'dev', 'tap0'))