: Establish a console connection and ensure your PC can ping the router’s interface. : Always backup your current image first: copy flash: tftp: Copy Image copy tftp: flash: Enter Details : Provide the TFTP server IP and the filename c3725-adventerprisek9-mz.124-25d.bin Set Boot Variable : Tell the router to use the new image: conf t boot system flash:c3725-adventerprisek9-mz.124- d.bin exit wr Use code with caution. Copied to clipboard to boot into the new software. 4. Verification Commands Once booted, verify the installation with these commands: show version : Confirms the IOS version and the configuration register. show flash
Router# show version | include IOS Router# show crypto key mypubkey rsa (if K9 works, this returns a key) c3725adventerprisek9mz12425dbin
Here's a breakdown: