Upgrading IOS in 4500 series switches

Copy the new IOS image to switch

copy tftp: bootflash:

verify the image

verifiy bootflash:IOS-NAME

If 4500 is connected in VSS then follow below steps,

1. copy bootflash: slavebootflash:
2. verify slavebootflash:IOS-NAME

Set the boot register to 0×2102 for the switch to boot from the BOOT variable. 

config-register 0x2102

If it is not set then it will try to use 0x2101 setting and will lead to use the first file found in the bootflash. If there is no other IOS then ignore this else configure the register with 0x2102. 0x2102 will use the boot system command which you will set in next step.

Set the boot variable to new image

no boot system flash bootflash:IOS-NAME

boot system flash bootflash:IOS-NAME

no boot system flash slavebootflash:IOS-NAME

boot system flash slavebootflash:IOS-NAME

Save the config

write

Verify the bootvar path

show bootvar

Now you are all set to reboot the device !