Licensing Methods for Air-Gapped Networks
Cisco ISE Release 3.0 Patch 2 supports the following licensing solution for air-gapped networks:
Smart Software Manager (SSM) On-Prem Connection Method
SSM On-Prem is a connection method in which you configure an SSM On-Prem server that manages smart licensing in your Cisco ISE-enabled network. With this connection method, Cisco ISE does not require a persistent connection to the Internet."