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The way I solved it, is after installing RDO, I ended up having Open vSwitch on every compute node. Since all the VMs are in the same subnet, their internal traffic (VM to VM) is not going via router, but via switch only. Hence, I used OvS commands to collect traffic info. e.g.

ovs-dpctl dump-flows

This command shows the number of bytes transmitted between any two VMs. You have to execute it on the compute node where the desired VM is running at.
Note, that this is a switch. So you don't see IP addresses, but MAC addresses only. To get the MAC address of your VM, you can use these two commands:

nova list

And then

neutron port-list