Even though we try to setup separate DNS servers according to subnet, it fails in the config-drive(network_data.json).

1)command neutron subnet-update 6113740e-db64-4d46-b4c4-46bb418393e5 --dns-nameservers list=true 1.1.1.2

2)result in network_data.json {"services": [{"type": "dns", "address": "147.214.6.234"}, {"type": "dns", "address": "1.1.1.2"}], …

Do you know how to separate DNS server for each subnet?