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Which network does openstack use to transfer data during live migration?

Hi. I am doing some reasearch in live migration within cloud environments. I have set up Openstack Mitaka on Ubuntu 14.04 LTS servers. The setup uses two nics each on the servers ( one all in one node and one compute node), one for management network, and the other for provider network (tunnel network and vlans are trunked through my provider network interface). My doubt is that when i live migrate an instance from one host to another, which path does the vm data teavel by? Is it through the management network, or through the provider network? Thanks.