The biggest change coming to ISE 3.0 is in its licensing model. In prior versions, licenses at the Base tier that provided entry-level 802.1X and Guest services were permanent licenses that did not require renewal. However, in ISE 3.0 Base licenses also become term-based in the same way as the prior Plus and Apex tiers.
Licensing tiers have also been renamed, in line with the current standard licensing tiers for Enterprise Network products:
The new licensing model is described by Cisco as using a “nested doll” model – put simply, where previously Apex licenses did not include Plus tier features, licenses now include all features in any below tier. Premier licenses include Advantage and Essentials features, and Advantage licenses include Essentials features.
More information on the new licensing model and conversion can be found here.
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