Theboot systemcommand is used in globalconfiguration mode to specify the source and filename of the Cisco IOS software image that should be loaded during the device’s boot process. This command ensures that the device loads a specific IOS image, whether it's stored locally in flash or fetched from a TFTP server.
Syntax example:
boot system flash:c1900-universalk9-mz.SPA.157-3.M3.bin
boot image,boot ios, andboot sourceare invalid or non-existent in standard Cisco IOS.
[Reference:Supporting Cisco Devices for Field Technicians (FLDTEC) –Cisco IOS Software Basics, ===========]
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