diff --git a/lib/neutron_plugins/linuxbridge_agent b/lib/neutron_plugins/linuxbridge_agent
index c9ea1ca..b348af9 100644
--- a/lib/neutron_plugins/linuxbridge_agent
+++ b/lib/neutron_plugins/linuxbridge_agent
@@ -7,6 +7,10 @@
 PLUGIN_XTRACE=$(set +o | grep xtrace)
 set +o xtrace
 
+function neutron_lb_cleanup {
+    sudo brctl delbr $PUBLIC_BRIDGE
+}
+
 function is_neutron_ovs_base_plugin {
     # linuxbridge doesn't use OVS
     return 1
@@ -29,6 +33,7 @@
 }
 
 function neutron_plugin_configure_l3_agent {
+    sudo brctl addbr $PUBLIC_BRIDGE
     iniset $Q_L3_CONF_FILE DEFAULT external_network_bridge
     iniset $Q_L3_CONF_FILE DEFAULT l3_agent_manager neutron.agent.l3_agent.L3NATAgentWithStateReport
 }
diff --git a/lib/neutron_plugins/ovs_base b/lib/neutron_plugins/ovs_base
index 51999c6..81561d3 100644
--- a/lib/neutron_plugins/ovs_base
+++ b/lib/neutron_plugins/ovs_base
@@ -8,7 +8,6 @@
 set +o xtrace
 
 OVS_BRIDGE=${OVS_BRIDGE:-br-int}
-PUBLIC_BRIDGE=${PUBLIC_BRIDGE:-br-ex}
 OVS_DATAPATH_TYPE=${OVS_DATAPATH_TYPE:-""}
 
 function is_neutron_ovs_base_plugin {