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CCNP Security SISAS 300-208 Official Cert Guide by Kevin Redmon, Aaron Woland

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Node Groups

PSNs do not necessarily need to have an HA type of configuration. Every ISE node maintains a full copy of the database, and the NADs have their own detection of a “dead” RADIUS server, which triggers the NAD to send AAA communication to the next RADIUS server in the list.

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However, ISE does have a concept of a node group. Node groups are made up of Layer-2 adjacent (same VLAN) PSNs, where the nodes maintain a heartbeat with each other. In the event that a PSN goes down while a session is being authenticated, one of the other PSNs in the node group sends a CoA to the NAD so the endpoint can restart the session establishment with a new ...

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