I've been reading up on 5.1 and am wondering how and if actual failover across subnets is an option.
I understand the roaming of clients from controllers in the same MG on diff subnets.
How does it work if your primary "anchor" isn't alive to replicate the DB entry to the off-subnet controller? Say if my local WIsm's die and the backup is in the next state, how will the AP's maintain connectivity?
Yes, but tha ap's will take the new configuration from that WLC. Also... users will get tunneled back to that wlc and be dumped off in that subnet. So make sure you understand the ssid and what ip's clients will get when they associate to different wlc's. That should do it.