1. You need to make a list of everything that refers to it for aaa and change thier profiles to reflect the new address (that is if your devices are using ip address and not DNS to rech the server)

2. You need to make plans to change any replication partners (if you have any more aaa servers) to reflect the new address.

3. You need to plan this with your business to minimize the impact on your business. (as in change board process/business governance)