Cisco ISE incorporated Cisco ACS (Cisco Secure Access Control System) between ISE releases 2.0 and 2.3. Cisco ACS was a network access policy platform that provided authentication, authorization, and accounting (AAA) services for network devices and users. Cisco ACS was discontinued in 2017 and replaced by Cisco ISE, which offers more advanced features and capabilities for identity-based network access control. Cisco ISE provides a migration tool that allows customers to migrate their data and configurations from Cisco ACS to Cisco ISE. The migration tool supports Cisco ACS versions 5.5, 5.6, 5.7, and 5.8 and Cisco ISE versions 2.0, 2.1, 2.2, and 2.3.
References:
Cisco Secure Access Control System End-of-Life Announcement [Cisco Secure Access Control System]
Cisco Secure ACS to Cisco ISE Migration Tool [Cisco Identity Services Engine]
Cisco Identity Services Engine Administrator Guide, Release 2.3 - Cisco Secure ACS to Cisco ISE Migration [Cisco Identity Services Engine]
Cisco Identity Services Engine Administrator Guide, Release 2.3 - Manage Migration [Cisco Identity Services Engine]
[Cisco Identity Services Engine Migration Guide, Release 2.3 [Cisco Identity Services Engine]]
[Designing Cisco Enterprise Networks (ENDESIGN) Exam Topics [Cisco]]
[Cisco Validated Design Guides [Cisco]]
ISE 2.3 includes the final suite of capabilities designed to reach feature parity with Cisco Secure Access Control System (ACS), allowing all existing ACS customers to migrate their deployment to ISE. New features include TACACS+-based device administration for IPv6, import and export capabilities for TACACS+-based command sets, policy export scheduling, IP range support in all octets, and more. See the ACS vs ISE Comparison for feature comparisons with every release of ISE
