diff --git a/lib/neutron_plugins/ml2 b/lib/neutron_plugins/ml2
index e1f868f..f00feac 100644
--- a/lib/neutron_plugins/ml2
+++ b/lib/neutron_plugins/ml2
@@ -156,5 +156,9 @@
     return 0
 }
 
+function configure_qos_ml2 {
+    neutron_ml2_extension_driver_add "qos"
+}
+
 # Restore xtrace
 $_XTRACE_NEUTRON_ML2
diff --git a/lib/neutron_plugins/services/l3 b/lib/neutron_plugins/services/l3
index 98b96ac..72f7a32 100644
--- a/lib/neutron_plugins/services/l3
+++ b/lib/neutron_plugins/services/l3
@@ -427,3 +427,12 @@
     EXT_LIST=$(openstack --os-cloud devstack-admin --os-region "$REGION_NAME" extension list --network -c Alias -f value)
     [[ $EXT_LIST =~ $extension ]] && return 0
 }
+
+function plugin_agent_add_l3_agent_extension {
+    local l3_agent_extension=$1
+    if [[ -z "$L3_AGENT_EXTENSIONS" ]]; then
+        L3_AGENT_EXTENSIONS=$l3_agent_extension
+    elif [[ ! ,${L3_AGENT_EXTENSIONS}, =~ ,${l3_agent_extension}, ]]; then
+        L3_AGENT_EXTENSIONS+=",$l3_agent_extension"
+    fi
+}