Does Anybody know how to keep the license files and Certificates
The Cisco Identity Services Engine (ISE) provides distributed deployment of runtime services with centralized configuration and management. Multiple nodes can be deployed together in a distributed fashion to support failover.
If you register a secondary Monitoring ISE node, it is recommended that you first back up the primary Monitoring ISE node and then restore the data to the new secondary Monitoring ISE node. This ensures that the history of the primary Monitoring ISE node is in sync with the new secondary node as new changes are replicated.
Please Check the below configuration guide for Secondary ISE- Nodes.
As for certs you need to export them from the servers before you upgrade ..
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