didn't get this. how can a cluster coordinate migration if it does not manage the relevant networks?
if you need more bandwidth, the best way is to use multiple bridges on the nodes: assign to vmbr0 (always used by cluster) the fast network for cluster oprations, and use another vmbrX (on another card or bond) for your VMs. Ie: move your higher bandwidth network connection under cluster control... and use other network connections for regular network traffic
Marco