Comment 4 for bug 1743425

Matt Faraday (lordxenu) wrote :

And I found my solution (sorry for the constant comments but I hope it helps someone)

I had to login to mysql as the neutron user (password was found in neutron.conf)

Then I had to select neutron DB and run command

MariaDB [neutron]> TRUNCATE TABLE ml2_vlan_allocations;

Now I am able to change the network_vlan_ranges in ml2_conf.ini and the bridge_mappings directives in openvswitch_agent.ini

No idea why it's keeping those old entries in the database when nothing is using them.
But this resolved it for me.