Cisco 3945 IOS upgrade

[shantanu.adhya@tcs.com]

Hi ,

I need to upgrade a Cisco 3945 router .

Current the router has boot marker:
boot-start-marker
boot system flash c3900-universalk9-mz.SPA.156-3.M1.bin
boot system flash c3900-universalk9-mz.SPA.155-3.M3.bin
boot-end-marker

The c3900-universalk9-mz.SPA.155-3.M3.bin IOS has been deleted .

I have copied c3900-universalk9-mz.SPA.157-3.M1.bin version in the flash .

Please suggest how to change the boot marker to :

boot system flash c3900-universalk9-mz.SPA.157-3.M1.bin
boot system flash c3900-universalk9-mz.SPA.156-3.M1.bin

[Leo Laohoo · Accepted solution]

conf t

no boot system flash flash:c3900-universalk9-mz.SPA.155-3.M3.bin

boot system flash flash:c3900-universalk9-mz.SPA.157-3.M1.bin
boot system flash flash:c3900-universalk9-mz.SPA.156-3.M1.bin

end

[Dennis Mink]

and once rebooted rip the old IOS out. by deleting it from flash. but only once you successfully boot up on the new IOS

[shantanu.adhya@tcs.com]

Hi After reboot the latest version should be displayed under show version.

[shantanu.adhya@tcs.com]

conf t

no boot system flash flash:c3900-universalk9-mz.SPA.155-3.M3.bin

boot system flash flash:c3900-universalk9-mz.SPA.157-3.M1.bin
boot system flash flash:c3900-universalk9-mz.SPA.156-3.M1.bin

end

 _________________________________________________________

do I have to use flash twice or just 

boot system  flash0 :c3900-universalk9-mz.SPA.157-3.M1.bin

[Y4ssine]

Hi,

Just do it one time.

"boot system  flash0 :c3900-universalk9-mz.SPA.157-3.M1.bin" is not stated between your boot-start-marker & boot-end-marker.

More info can be found here:

https://www.cisco.com/c/en/us/td/docs/ios/12_2/configfun/command/reference/ffun_r/frf010.html#wp1017705

Regards,

Yassine

[shantanu.adhya@tcs.com]

Hi ,

Does the boot system flash command instantly reboot the router after using the command.

[Leo Laohoo]

Nope.