10-25-2017 06:14 AM - edited 02-21-2020 10:36 AM
10-25-2017 08:39 AM
Are you migrating just for device administration or are you doing network access control for end users with ACS as well?
Is your ACS currently on an appliance (if so what model) or VM and do you want high availability?
10-27-2017 09:25 AM
You are missing a few details:
1.-How many users are authenticated using ACS? This would define what kind of ISE you could probably need (3495 or 3595).
2.-Do you need Load Balancing or not?
3.-Depending on the number of users, you could probably need at least 4 appliances or VM's as indicated by marvin.
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