Reference:
In Cisco NX-OS, the show boot command is used to display the current boot variable configuration, which includes information about the designated boot image and other boot settings on the device. The boot variable determines which software image the device will load on the next reboot. This is crucial for ensuring that the correct firmware or operating system version is used during startup, especially in data center environments where stability and compatibility are essential.
Details of Command Options for Context:
display boot: This command is not valid in Cisco NX-OS. "display" is not a recognized command syntax in Cisco's command-line interface.
open boot: This is also not a valid command in Cisco NX-OS. There is no such command as "open boot" in the command set.
show config: While show config or similar variations like show running-config or show startup-config are used to display the configuration on Cisco devices, they do not specifically display the boot variables. These commands are used to view the full configuration of the device but do not isolate boot-related information.
show boot: The show boot command is the correct answer as it specifically displays the boot configuration, including boot variables and the path to the system image file designated for startup. This command is commonly used by network engineers to verify or troubleshoot boot configurations in Cisco NX-OS environments.
Cisco Datacenter Networking Device Reference:
Cisco Nexus Switches (NX-OS): Cisco Nexus switches running NX-OS support the show boot command, making it easy for engineers to verify and troubleshoot boot variables in complex data center deployments. For example, on the Cisco Nexus 9000 series, running show boot provides the path to the system boot image.
Cisco UCS (Unified Computing System): Though UCS uses a different configuration model, the UCS Fabric Interconnects, which may run an NX-OS-based operating system, also utilize similar commands for managing boot variables.
In summary, show boot is the correct command for displaying the boot variable configuration in Cisco NX-OS, enabling network administrators to verify the boot settings and ensure that devices are configured to boot with the appropriate software image.