Comment 8 for bug 1799737

@axino I assume the environment you have that is using external_network_bridge/external_network_id is quite old and was originally deployed with a version older than Queens? Using these option to configure external networks is really deprecated and since at least Juno we have used bridge_mappings for this purpose (and to allow > 1 external network). There is an annoying quirk here though (and perhaps this is why you have not switched) which is that with the old way the network will likely not have a provider name (in the db) and therefore migrating it as-is to a bridge_mappings type config will break the network (unless perhaps one can be set manually in the database).