We need to upgrade a distributed ISE deployment from 2.3 to 2.4 from the CLI, to remain AAA service online consistently. There is a question confusing me. As per the upgrade guide as below, after upgrading, the Secondary Administration Node (node B) becomes the primary node of the new deployment when it restarts. Then MNT and PSN nodes will be upgraded in sequence.
My question is how the MNT and PSN nodes join the new primary PAN node? Do they join it automatically? Or we have to add them to the new PAN manually?
Could anyone give me some guidance on this? Thanks in advance.