Resolved! Some question about R610 and R500 work together under unleashed.
I have some R500s, firmware is 200.7, and two R610s firmware is 200.7 too.Any possible to do that:1. I prefer to set two R610s as unleashed master, r610-1 for master , r610-2 for master backup. when r610-1 failed, the r610-2 will take over the master...