LVS has the ability to multicast-sync connection states: http://www.linuxvirtualserver.org/docs/sync.html , and if we used it, it would cut down on connection loss during LVS failover events (which are currently required even for e.g. pybal config changes).

1. Ensure it actually works for us
2. Assign multicast IPs to separate out traffic clusters (e.g. high-traffic1 vs low-traffic) and DCs
3. Deploy slowly by-cluster/dc, check for: works functionally, whether there's any perf loss to the overhead, how big the multicast traffic rate is, etc.