How do you handle Route Domains?
Through time, I've solved a million unique issues with route domains, as they allow you to lock down portions of your network, but more importantly, they allow you to overlap IP addresses. Some people find them scary. To me, I find that a simple organization plan at the beginning helps me to get things situated. I'm looking to see how other people approach design here.
Firstly, Route Domain 0 is special. I try to reserve that for 'on-box' communication, or critical data plane communication for services like DNS or upstream / downstream routes, depending on your use for the box, in general. I avoid putting any VIPs (besides SelfIPs or maybe a forwarding VS, if the need were there) on RD0 at all, as it is shared. If you think of your other route domains as 'tennants' of 0's 'host' services, you should succeed.
Community, if you've got a second, I'd love to hear your thoughts on this. How do you feel about route domains? Do you use IP overlap? Why or why not?