Neutron - Networking Service

Preparation and deployment

Neutron is enabled by default in /etc/kolla/globals.yml:

#enable_neutron: "{{ enable_openstack_core | bool }}"

Neutron external interface is used for communication with the external world, for example provider networks and floating IPs. For setting up the neutron external interface please modify /etc/kolla/globals.yml setting neutron_external_interface to the desired interface name, eth1 in the example below:

neutron_external_interface: "eth1"


This is used by hosts in the network group, and hosts in the compute group if enable_neutron_provider_networks is set or DVR is enabled.

To use provider networks in instances you also need to set the following in /etc/kolla/globals.yml:

enable_neutron_provider_networks: yes


enable_neutron_provider_networks ensures neutron_external_interface is used on hosts in the compute group.

By default kolla-ansible uses openvswitch as its underlying network mechanism, you can change that using the neutron_plugin_agent variable in /etc/kolla/globals.yml:

neutron_plugin_agent: "openvswitch"

When using Open vSwitch on a compatible kernel (4.3+ upstream, consult the documentation of your distribution for support details), you can switch to using the native OVS firewall driver by employing a configuration override (see OpenStack Service Configuration in Kolla). You can set it in /etc/kolla/config/neutron/ml2_conf.ini:

firewall_driver = openvswitch