[root@openstackctl neutron]# cat /etc/neutron/l3_agent.ini
[DEFAULT]
# Show debugging output in log (sets DEBUG log level output)
# debug = False

# L3 requires that an interface driver be set. Choose the one that best
# matches your plugin.
# interface_driver =

# Example of interface_driver option for OVS based plugins (OVS, Ryu, NEC)
# that supports L3 agent
# interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver

# Use veth for an OVS interface or not.
# Support kernels with limited namespace support
# (e.g. RHEL 6.5) so long as ovs_use_veth is set to True.
# ovs_use_veth = False

# Example of interface_driver option for LinuxBridge
# interface_driver = neutron.agent.linux.interface.BridgeInterfaceDriver

# Allow overlapping IP (Must have kernel build with CONFIG_NET_NS=y and
# iproute2 package that supports namespaces).
# use_namespaces = True

# If use_namespaces is set as False then the agent can only configure one router.

# This is done by setting the specific router_id.
# router_id =

# Each L3 agent can be associated with at most one external network.  This
# value should be set to the UUID of that external network.  If empty,
# the agent will enforce that only a single external networks exists and
# use that external network id
# gateway_external_network_id =

# Indicates that this L3 agent should also handle routers that do not have
# an external network gateway configured.  This option should be True only
# for a single agent in a Neutron deployment, and may be False for all agents
# if all routers must have an external network gateway
# handle_internal_only_routers = True

# Name of bridge used for external network traffic. This should be set to
# empty value for the linux bridge
# external_network_bridge = br-ex

# TCP Port used by Neutron metadata server
# metadata_port = 9697

# Send this many gratuitous ARPs for HA setup. Set it below or equal to 0
# to disable this feature.
# send_arp_for_ha = 3

# seconds between re-sync routers' data if needed
# periodic_interval = 40

# seconds to start to sync routers' data after
# starting agent
# periodic_fuzzy_delay = 5

# enable_metadata_proxy, which is true by default, can be set to False
# if the Nova metadata server is not available
# enable_metadata_proxy = True

# Location of Metadata Proxy UNIX domain socket
# metadata_proxy_socket = $state_path/metadata_proxy