Hi Robert, As I said before, you'll have network disruptions everytime you change network topology and that's not because of ovirt but because you need to restart network to set the new interfaces, routing tables and addresses, etc. This does not mean that you loose access to your hosts, if everything goes right and you have everything set correctly, then after network comes up, you should have access to your hosts. But if you have network traffic, it will loose connectivity for a few seconds. For the switch stuff, a "simple switch" will forward all packages regardless of the vlan tag, so you won't need to configure anything. These are the "domestic" or "soho" kind of switches. If you have a vlan aware switch (most managed cheap ones have vlan features), then you'll have to set vlans (either tagged or untagged) in the respective ports to be able to get traffic from them. Remember that marking a network in ovirt as a vlan network means that it'll be accepting tagged traffic from that vlan. If you set your ports to have a native vlan (untagged), then you should use non-vlan networks in ovirt. Regards,