how ml2_config.ini needs to look at this point

ml2_config.ini.md

The file should look like this:

[ml2]
type_drivers = vxlan

tenant_network_types = vxlan

mechanism_drivers = openvswitch

[ml2_type_flat]
flat_networks =

[ml2_type_vlan]
network_vlan_ranges =

[ml2_type_gre]
tunnel_id_ranges =

[ml2_type_vxlan]
vni_ranges = 1:1000

vxlan_group =

[securitygroup]
firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
enable_security_group = True

[ovs]
local_ip = 192.168.94.85
enable_tunneling = True
tunnel_type = vxlan

[agent]
tunnel_types = vxlan
root_helper = sudo /usr/bin/neutron-rootwrap /etc/neutron/rootwrap.conf

On the controller. On the compute node, I think similar config needs to be present in order for neutron to configure ovs, but I'm not sure.

Notes.md

Don't forget to restart everything that may touch this on all of the service nodes.

  570  for s in /etc/init.d/openvswitch-* ; do $s restart; done
  571  for s in /etc/init.d/nova-* ; do $s restart; done

Otherwise the scheduler won't be able to find a viable host for the networks you made or some nonsense like that.