A Flat Network is another network type that is supported by the OpenStack Neutron ML2 plugin. Flat Networks are useful when tenant network isolation is not a mandatory requirement. Another scenario for a Flat Network type could be the access to centralized storage for all the instances using a dedicated physical interface.
To use Flat Networks, the ML2 plugin's type driver and related settings need to be updated. Just as VLAN, the Flat Network type can work with an OVS or Linux bridge mechanism driver. In our example, we will use the Linux bridge mechanism driver.
The following steps will show you how to configure the Flat Network as the type driver and tenant network type: