I'm designing a relatively large wireless deployment and it has been sized for approx 4K users.
The network is to be layer3 with the intent of using AP groups to reduce the size of the broadcast domain.
Are these assumptions then correct:
1. During the failure of a WISM, all AP's reboot and reconnect to the secondary WISM. Clients reassociate and request new IP addresses from the new subnet.
2. If 1. is correct then it is safe to presume that with a third controller I would need 4K * 3 = 12K addresses (worse case).
3. As I am unlikely to be allocated 12K addresses the workaround would be to place all the WISM's AP interfaces into the same VLAN (layer2) so DHCP scope remains the same, and keep layer3 between WISM and AP's.
Thanks in advance.