The Cisco Nexus 9500 Series switches have a modular architecture that consists of switch chassis, supervisors, system controllers, fabric modules, line cards, power supplies and fan trays. Among these parts, supervisors, system controllers, line cards and power supplies are common components that can be shared among the entire Nexus 9500 product family.
The Cisco Nexus 9500 Series support redundant half-width supervisor engines that are responsible for control-plane functions. The switch software, Enhanced NX-OS, runs on the supervisor modules. The redundant supervisor modules take active and standby roles supporting stateful switch over in the event of supervisor module hardware failure.