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If you will remind suggested to you :-
External network provider is invoked only on Node1. However fail-over plays nicely with Neutron. Why that ?

1. MariadbGalera MultiMaster Synchronous Replica is running on all 3 Controller/Network Nodes
2.`neutron-db-manage --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugin.ini upgrade head`
has been already run, before external network provider was invoked.
Hence, changes been done on Node 1 will be populated across Controller's cluster.