[Users] Choosing which network to run VM migration on ovirt 3.1

Hi, I'm running the following setup: 2 hosts, each has 2 physical NICs, the first NIC (which is bridged to ovirtmgmt) is a 100Mbps ethernet card connected to a switch (and to the internet) the 2nd NIC is a fast Infiniband card which is connected back-to-back to the other host. both links are running fine, and I managed to have the 2nd host mount the storage via the fast link. The problem is that VM migration takes place over the slow link. How do I configure the cluster so that the migration uses the fast link? I've already created a network using the web interface. the migration still uses the slow link. Thanks, Yuval