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Network topology discovery

I don't even know how much of this is possible but we would like to be able to discover as much as we can about the switch a particular NIC is connected to. At the very least, what about asking for DHCP info over the NIC before we hand it off to the VM and working out what subnet it is on? (I realize this could be a terrible idea but having the network topology information available in the oVirt UI would be pretty cool.)