This notification-only string carries identifying information about the node where a switchover occurred, included as a variable binding in the hh3cRddcSwitchoverTrap. Admins read it within the trap payload to know specifically which node was involved in a switchover event, without needing to separately query the node table. A hh3cRddcSwitchoverTrap carrying hh3cRddcNodeInfo text like "chassis 1, slot 2" tells the admin exactly which hardware experienced the switchover.