diff --git a/.zuul.yaml b/.zuul.yaml
index b65aeec4dd..4ca0257cc6 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -468,6 +468,8 @@
         SWIFT_HASH: 1234123412341234
         DEBUG_LIBVIRT_COREDUMPS: true
         NOVA_VNC_ENABLED: true
+        OVN_L3_CREATE_PUBLIC_NETWORK: true
+        OVN_DBS_LOG_LEVEL: dbg
       devstack_local_conf:
         post-config:
           $NEUTRON_CONF:
@@ -496,13 +498,14 @@
         n-sch: true
         # Placement service
         placement-api: true
+        # OVN services
+        ovn-controller: true
+        ovn-northd: true
+        ovs-vswitchd: true
+        ovsdb-server: true
         # Neutron services
-        q-agt: true
-        q-dhcp: true
-        q-l3: true
-        q-meta: true
-        q-metering: true
         q-svc: true
+        q-ovn-metadata-agent: true
         # Swift services
         s-account: true
         s-container: true
@@ -534,8 +537,12 @@
           n-cpu: true
           # Placement services
           placement-client: true
+          # OVN services
+          ovn-controller: true
+          ovs-vswitchd: true
+          ovsdb-server: true
           # Neutron services
-          q-agt: true
+          q-ovn-metadata-agent: true
           # Cinder services
           c-bak: true
           c-vol: true
@@ -553,6 +560,7 @@
           GLANCE_HOSTPORT: "{{ hostvars['controller']['nodepool']['private_ipv4'] }}:9292"
           Q_HOST: "{{ hostvars['controller']['nodepool']['private_ipv4'] }}"
           NOVA_VNC_ENABLED: true
+          ENABLE_CHASSIS_AS_GW: false
 
 - job:
     name: devstack-ipv6
diff --git a/lib/neutron_plugins/ml2 b/lib/neutron_plugins/ml2
index ae4b251d83..e1f868f0a7 100644
--- a/lib/neutron_plugins/ml2
+++ b/lib/neutron_plugins/ml2
@@ -7,15 +7,16 @@
 _XTRACE_NEUTRON_ML2=$(set +o | grep xtrace)
 set +o xtrace
 
-# Default openvswitch L2 agent
-Q_AGENT=${Q_AGENT:-openvswitch}
+# Default OVN L2 agent
+Q_AGENT=${Q_AGENT:-ovn}
 if [ -f $TOP_DIR/lib/neutron_plugins/${Q_AGENT}_agent ]; then
     source $TOP_DIR/lib/neutron_plugins/${Q_AGENT}_agent
 fi
 
 # Enable this to simply and quickly enable tunneling with ML2.
-# Select either 'gre', 'vxlan', or 'gre,vxlan'
-Q_ML2_TENANT_NETWORK_TYPE=${Q_ML2_TENANT_NETWORK_TYPE:-"vxlan"}
+# For ML2/OVS select either 'gre', 'vxlan', or 'gre,vxlan'.
+# For ML2/OVN use 'geneve'.
+Q_ML2_TENANT_NETWORK_TYPE=${Q_ML2_TENANT_NETWORK_TYPE:-"geneve"}
 # This has to be set here since the agent will set this in the config file
 if [[ "$Q_ML2_TENANT_NETWORK_TYPE" == "gre" || "$Q_ML2_TENANT_NETWORK_TYPE" == "vxlan" ]]; then
     Q_TUNNEL_TYPES=$Q_ML2_TENANT_NETWORK_TYPE
@@ -24,7 +25,7 @@ elif [[ "$ENABLE_TENANT_TUNNELS" == "True" ]]; then
 fi
 
 # List of MechanismDrivers to load
-Q_ML2_PLUGIN_MECHANISM_DRIVERS=${Q_ML2_PLUGIN_MECHANISM_DRIVERS:-openvswitch,linuxbridge}
+Q_ML2_PLUGIN_MECHANISM_DRIVERS=${Q_ML2_PLUGIN_MECHANISM_DRIVERS:-ovn}
 # Default GRE TypeDriver options
 Q_ML2_PLUGIN_GRE_TYPE_OPTIONS=${Q_ML2_PLUGIN_GRE_TYPE_OPTIONS:-tunnel_id_ranges=$TENANT_TUNNEL_RANGES}
 # Default VXLAN TypeDriver options
diff --git a/lib/neutron_plugins/ovn_agent b/lib/neutron_plugins/ovn_agent
index e4d0d75230..4af1340a26 100644
--- a/lib/neutron_plugins/ovn_agent
+++ b/lib/neutron_plugins/ovn_agent
@@ -21,10 +21,6 @@
 source ${TOP_DIR}/lib/neutron_plugins/ovs_base
 source ${TOP_DIR}/lib/neutron_plugins/openvswitch_agent
 
-# Load devstack ovs base functions
-source $NEUTRON_DIR/devstack/lib/ovs
-
-
 # Defaults
 # --------
 
@@ -88,12 +84,18 @@ OVN_INSTALL_OVS_PYTHON_MODULE=$(trueorfalse False OVN_INSTALL_OVS_PYTHON_MODULE)
 # configure the MTU DHCP option.
 OVN_GENEVE_OVERHEAD=${OVN_GENEVE_OVERHEAD:-38}
 
-# The log level of the OVN databases (north and south)
+# The log level of the OVN databases (north and south).
+# Supported log levels are: off, emer, err, warn, info or dbg.
+# More information about log levels can be found at
+# http://www.openvswitch.org/support/dist-docs/ovs-appctl.8.txt
 OVN_DBS_LOG_LEVEL=${OVN_DBS_LOG_LEVEL:-info}
 
 OVN_META_CONF=$NEUTRON_CONF_DIR/neutron_ovn_metadata_agent.ini
 OVN_META_DATA_HOST=${OVN_META_DATA_HOST:-$(ipv6_unquote $SERVICE_HOST)}
 
+# If True (default) the node will be considered a gateway node.
+ENABLE_CHASSIS_AS_GW=$(trueorfalse True ENABLE_CHASSIS_AS_GW)
+
 export OVSDB_SERVER_LOCAL_HOST=$SERVICE_LOCAL_HOST
 if [[ "$SERVICE_IP_VERSION" == 6 ]]; then
     OVSDB_SERVER_LOCAL_HOST=[$OVSDB_SERVER_LOCAL_HOST]
@@ -171,6 +173,9 @@ function wait_for_sock_file {
 }
 
 function use_new_ovn_repository {
+    if [[ "$OVN_BUILD_FROM_SOURCE" == "False" ]]; then
+        return 0
+    fi
     if [ -z "$is_new_ovn" ]; then
         local ovs_repo_dir=$DEST/$OVS_REPO_NAME
         if [ ! -d $ovs_repo_dir ]; then
@@ -390,6 +395,9 @@ function install_ovn {
     sudo ln -s $OVS_RUNDIR $OVN_RUNDIR
 
     if [[ "$OVN_BUILD_FROM_SOURCE" == "True" ]]; then
+        # Load devstack ovs base functions
+        source $NEUTRON_DIR/devstack/lib/ovs
+
         # If OVS is already installed, remove it, because we're about to
         # re-install it from source.
         for package in openvswitch openvswitch-switch openvswitch-common; do
diff --git a/stackrc b/stackrc
index 196f61fa3c..05016594eb 100644
--- a/stackrc
+++ b/stackrc
@@ -72,8 +72,10 @@ if ! isset ENABLED_SERVICES ; then
     ENABLED_SERVICES+=,g-api
     # Cinder
     ENABLED_SERVICES+=,c-sch,c-api,c-vol
+    # OVN
+    ENABLED_SERVICES+=,ovn-controller,ovn-northd,ovs-vswitchd,ovsdb-server
     # Neutron
-    ENABLED_SERVICES+=,q-svc,q-dhcp,q-meta,q-agt,q-l3
+    ENABLED_SERVICES+=,q-svc,q-ovn-metadata-agent
     # Dashboard
     ENABLED_SERVICES+=,horizon
     # Additional services