Mechanism drivers are responsible for implementing networks described by the type driver. Mechanism drivers included with the ML2 plugin include linuxbridge, openvswitch, and l2population.
Update the ML2 configuration file on the controller01 node and add the following mechanism_drivers:
[ml2]
...
mechanism_drivers = linuxbridge,l2population
The Neutron Linux bridge agent requires specific configuration options that will be discussed later in this chapter.