diff --git a/lib/neutron_plugins/ofagent_agent b/lib/neutron_plugins/ofagent_agent
index d38fbebc74..0bc9bffb55 100644
--- a/lib/neutron_plugins/ofagent_agent
+++ b/lib/neutron_plugins/ofagent_agent
@@ -1,100 +1,4 @@
 #!/bin/bash
-#
-# OpenFlow Agent plugin
-# ----------------------
 
-# Save trace setting
-OFA_XTRACE=$(set +o | grep xtrace)
-set +o xtrace
-
-source $TOP_DIR/lib/neutron_plugins/ovs_base
-source $TOP_DIR/lib/neutron_thirdparty/ryu  # for RYU_DIR, install_ryu, etc
-
-function neutron_plugin_create_nova_conf {
-    _neutron_ovs_base_configure_nova_vif_driver
-}
-
-function neutron_plugin_install_agent_packages {
-    _neutron_ovs_base_install_agent_packages
-
-    # This agent uses ryu to talk with switches
-    install_package $(get_packages "ryu")
-    install_ryu
-}
-
-function neutron_plugin_configure_debug_command {
-    _neutron_ovs_base_configure_debug_command
-}
-
-function neutron_plugin_configure_dhcp_agent {
-    iniset $Q_DHCP_CONF_FILE DEFAULT dhcp_agent_manager neutron.agent.dhcp_agent.DhcpAgentWithStateReport
-}
-
-function neutron_plugin_configure_l3_agent {
-    _neutron_ovs_base_configure_l3_agent
-    iniset $Q_L3_CONF_FILE DEFAULT l3_agent_manager neutron.agent.l3_agent.L3NATAgentWithStateReport
-}
-
-function _neutron_ofagent_configure_firewall_driver {
-    if [[ "$Q_USE_SECGROUP" == "True" ]]; then
-        iniset /$Q_PLUGIN_CONF_FILE securitygroup firewall_driver neutron.agent.linux.iptables_firewall.IptablesFirewallDriver
-    else
-        iniset /$Q_PLUGIN_CONF_FILE securitygroup firewall_driver neutron.agent.firewall.NoopFirewallDriver
-    fi
-}
-
-function neutron_plugin_configure_plugin_agent {
-    # Set up integration bridge
-    _neutron_ovs_base_setup_bridge $OVS_BRIDGE
-    _neutron_ofagent_configure_firewall_driver
-
-    # Check a supported openflow version
-    OF_VERSION=`ovs-ofctl --version | grep "OpenFlow versions" | awk '{print $3}' | cut -d':' -f2`
-    if [ `vercmp_numbers "$OF_VERSION" "0x3"` -lt "0" ]; then
-        die $LINENO "This agent requires OpenFlow 1.3+ capable switch."
-    fi
-
-    # Enable tunnel networks if selected
-    if [[ "$OVS_ENABLE_TUNNELING" == "True" ]]; then
-        # Verify tunnels are supported
-        # REVISIT - also check kernel module support for GRE and patch ports
-        OVS_VERSION=`ovs-vsctl --version | head -n 1 | grep -E -o "[0-9]+\.[0-9]+"`
-        if [ `vercmp_numbers "$OVS_VERSION" "1.4"` -lt "0" ]; then
-            die $LINENO "You are running OVS version $OVS_VERSION. OVS 1.4+ is required for tunneling between multiple hosts."
-        fi
-        iniset /$Q_PLUGIN_CONF_FILE ovs local_ip $TUNNEL_ENDPOINT_IP
-    fi
-
-    # Setup physical network bridge mappings.  Override
-    # ``OVS_VLAN_RANGES`` and ``OVS_BRIDGE_MAPPINGS`` in ``localrc`` for more
-    # complex physical network configurations.
-    if [[ "$OVS_BRIDGE_MAPPINGS" == "" ]] && [[ "$PHYSICAL_NETWORK" != "" ]] && [[ "$OVS_PHYSICAL_BRIDGE" != "" ]]; then
-        OVS_BRIDGE_MAPPINGS=$PHYSICAL_NETWORK:$OVS_PHYSICAL_BRIDGE
-
-        # Configure bridge manually with physical interface as port for multi-node
-        sudo ovs-vsctl --no-wait -- --may-exist add-br $OVS_PHYSICAL_BRIDGE
-    fi
-    if [[ "$OVS_BRIDGE_MAPPINGS" != "" ]]; then
-        iniset /$Q_PLUGIN_CONF_FILE ovs bridge_mappings $OVS_BRIDGE_MAPPINGS
-    fi
-    if [[ "$OFAGENT_PHYSICAL_INTERFACE_MAPPINGS" != "" ]]; then
-        iniset /$Q_PLUGIN_CONF_FILE agent physical_interface_mappings \
-            $OFAGENT_PHYSICAL_INTERFACE_MAPPINGS
-    fi
-    AGENT_BINARY="$NEUTRON_BIN_DIR/neutron-ofagent-agent"
-
-    iniset /$Q_PLUGIN_CONF_FILE agent tunnel_types $Q_TUNNEL_TYPES
-}
-
-function neutron_plugin_setup_interface_driver {
-    local conf_file=$1
-    iniset $conf_file DEFAULT interface_driver neutron.agent.linux.interface.OVSInterfaceDriver
-    iniset $conf_file DEFAULT ovs_use_veth True
-}
-
-function neutron_plugin_check_adv_test_requirements {
-    is_service_enabled q-agt && is_service_enabled q-dhcp && return 0
-}
-
-# Restore xtrace
-$OFA_XTRACE
+# REVISIT(yamamoto): This file is intentionally left empty
+# in order to keep Q_AGENT=ofagent_agent work.
diff --git a/lib/neutron_thirdparty/ryu b/lib/neutron_thirdparty/ryu
deleted file mode 100644
index 1f78a21fa4..0000000000
--- a/lib/neutron_thirdparty/ryu
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/bin/bash
-#
-# Ryu SDN Framework
-# -----------------
-
-# Used by ofagent.
-# TODO(yamamoto): Switch to pip_install once the development was settled
-
-# Save trace setting
-RYU3_XTRACE=$(set +o | grep xtrace)
-set +o xtrace
-
-RYU_DIR=$DEST/ryu
-
-# Make this function idempotent and avoid cloning same repo many times
-# with RECLONE=yes
-_RYU_INSTALLED=${_RYU_INSTALLED:-False}
-function install_ryu {
-    if [[ "$_RYU_INSTALLED" == "False" ]]; then
-        git_clone $RYU_REPO $RYU_DIR $RYU_BRANCH
-        export PYTHONPATH=$RYU_DIR:$PYTHONPATH
-        pip_install $(cat $RYU_DIR/tools/pip-requires)
-        _RYU_INSTALLED=True
-    fi
-}
-
-# Restore xtrace
-$RYU3_XTRACE