Loading IOS on a WS-C3850 Switch

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  • Connect to the serial console
  • Connect the Mgmt interface to your network
  • Configure the Mgmt network interface (that's GigabitEthernet 0/0)
  • Test connectivity:
    • ping vrf Mgmt-intf or
    • ping vrf Mgmt-vrf
  • Set Mgmt interface as interface to use for TFTP transfer:
    • conf t
    • ip tftp source-interface gigabitEthernet 0/0
    • exit
  • Copy the .bin file to flash: via TFTP
    • copy tftp: flash:
  • Install the .bin file using this command:
    • software install file flash:cat3k_caa-universalk9.SPA.03.07.01.E.152-3.E1.bin
    • Answer yes when asked if you want to relaod the switch
    • Answer no when asked if you want to save the configuration
  • If you have a stack of 3850 switches, this only needs to be done on one stack member. The software will be upgraded on all stack members.