diff --git a/neutron/agent/linux/openvswitch_firewall/firewall.py b/neutron/agent/linux/openvswitch_firewall/firewall.py
index 81aeb6021f8..17f6bd8b5b0 100644
--- a/neutron/agent/linux/openvswitch_firewall/firewall.py
+++ b/neutron/agent/linux/openvswitch_firewall/firewall.py
@@ -18,6 +18,9 @@ import contextlib
 import copy
 
 import netaddr
+from neutron_lib.callbacks import events as callbacks_events
+from neutron_lib.callbacks import registry as callbacks_registry
+from neutron_lib.callbacks import resources as callbacks_resources
 from neutron_lib import constants as lib_const
 from oslo_log import log as logging
 from oslo_utils import netutils
@@ -393,17 +396,28 @@ class OVSFirewallDriver(firewall.FirewallDriver):
 
         """
         self.int_br = self.initialize_bridge(integration_bridge)
-        self._update_cookie = None
         self.sg_port_map = SGPortMap()
+        self.conj_ip_manager = ConjIPFlowManager(self)
         self.sg_to_delete = set()
+        self._update_cookie = None
         self._deferred = False
+        self.iptables_helper = iptables.Helper(self.int_br.br)
+        self.iptables_helper.load_driver_if_needed()
+        self._initialize_firewall()
+
+        callbacks_registry.subscribe(
+            self._init_firewall_callback,
+            callbacks_resources.AGENT,
+            callbacks_events.OVS_RESTARTED)
+
+    def _init_firewall_callback(self, resource, event, trigger, **kwargs):
+        LOG.info("Reinitialize Openvswitch firewall after OVS restart.")
+        self._initialize_firewall()
+
+    def _initialize_firewall(self):
         self._drop_all_unmatched_flows()
         self._initialize_common_flows()
         self._initialize_third_party_tables()
-        self.conj_ip_manager = ConjIPFlowManager(self)
-
-        self.iptables_helper = iptables.Helper(self.int_br.br)
-        self.iptables_helper.load_driver_if_needed()
 
     @contextlib.contextmanager
     def update_cookie_context(self):
diff --git a/neutron/tests/unit/agent/linux/openvswitch_firewall/test_firewall.py b/neutron/tests/unit/agent/linux/openvswitch_firewall/test_firewall.py
index d1476e89d8a..65fd78ca7da 100644
--- a/neutron/tests/unit/agent/linux/openvswitch_firewall/test_firewall.py
+++ b/neutron/tests/unit/agent/linux/openvswitch_firewall/test_firewall.py
@@ -13,6 +13,9 @@
 #    under the License.
 
 import mock
+from neutron_lib.callbacks import events as callbacks_events
+from neutron_lib.callbacks import registry as callbacks_registry
+from neutron_lib.callbacks import resources as callbacks_resources
 from neutron_lib import constants
 import testtools
 
@@ -390,6 +393,14 @@ class TestOVSFirewallDriver(base.BaseTestCase):
     def port_mac(self):
         return self.mock_bridge.br.get_vif_port_by_id.return_value.vif_mac
 
+    def test_callbacks_registered(self):
+        with mock.patch.object(callbacks_registry, "subscribe") as subscribe:
+            firewall = ovsfw.OVSFirewallDriver(mock.MagicMock())
+            subscribe.assert_called_once_with(
+                firewall._init_firewall_callback,
+                callbacks_resources.AGENT,
+                callbacks_events.OVS_RESTARTED)
+
     def test_initialize_bridge(self):
         br = self.firewall.initialize_bridge(self.mock_bridge)
         self.assertEqual(br, self.mock_bridge.deferred.return_value)