Boot Cisco Devices via tftp

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Cisco 4900 series switches

  • Connect to the serial console
  • Type CTRL-C at the right time to exit the infinite boot loop and get to the rommon prompt
  • At the rommon prompt
    • Type unset boot to reset the boot variable
    • Connect the switch's Mgmt port to the network using a crossover cable and wait for the message
    Established physical link 100MB Full Duplex
    Network layer connectivity may take a few seconds
    • Configure the Mgmt interface
      • set interface fa1
      • set ip route default
    • Type set to verify IP configuration
    • Check connectivity (ping TFTP server): ping ... The message Host is alive should appear
    • Boot the image via TFTP: boot tftp://
  • The image is not on the bootflash yet, so when you're at the switch's prompt, don't forget to
    • Connect port 1 to the network
    • configure VLAN 1
    • copy the IOS image from TFTP to bootflash
    • set the boot variable:
    Switch#conf t
    Switch(config)#no boot system
    Switch(config)#boot system flash bootflash:cat4500e-entservicesk9-mz.122-54.SG1.bin    
    Switch#write memory 
    Switch#sho bootvar  
    BOOT variable = bootflash:cat4500e-entservicesk9-mz.122-54.SG1.bin,1;
    • reload the switch