Open Stack

I installed openstack with openvswitch using vlan and it works well.
Below is my plugin.ini.
eth1 is connected to br-eth1.

Now, how should I configure br-ex for l3 routing.

[ml2]
type_drivers = vlan
tenant_network_types = vlan
mechanism_drivers = openvswitch
[ml2_type_flat]
[ml2_type_vlan]
network_vlan_ranges = physnet2:1:4000
[ml2_type_gre]
[ml2_type_vxlan]
[securitygroup]
firewall_driver = 
neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
enable_security_group = True
[ovs]
integration_bridge = br-int
bridge_mappings = physnet2:br-eth1

integration_bridge = br-int
bridge_mappings = physnet2:br-eth1