@Annie: if Your vm was created when ovs fw driver was used and has ovs_hybrid_plug=False then if You switch to iptables firewall driver, this vm will not have security groups at all. That will be the only impact of such vm later.
@Annie: if Your vm was created when ovs fw driver was used and has ovs_hybrid_ plug=False then if You switch to iptables firewall driver, this vm will not have security groups at all. That will be the only impact of such vm later.