
First, the hardware structure of the Cisco switch
- computing system —- CPU
- power system
- interface system
- storage system
Flash: Hard drive, store iOS and configuration commands
RAM: memory
ROM: read only memory
Description:
1ROM function: boot system, password recovery, system recovery or upgrade
Composition: bootstrap program: bootloader, used to boot the operating system
Switch program: used for password recovery and system upgrade
POST program: used to implement power-on self-test

Second, the introduction of the startup process of the Cisco switch
- power-on self-test POST
- load and run bootstrap from the ROM to start the microcode
- looking for IOS image files (flash)
- loading IOS image file (RAM)
- looking for a configuration file (NVRAM)
- load the configuration file (RAM)
- normal operation

The hardware structure of the Cisco switch and the startup process of the switch are introduced here. If you have other needs, please consult our online customer service.