Can I upload a Cisco IOS image with older IOS version?

Posted on 2014-02-11
Last Modified: 2014-02-19
Can I upload an image with an older IOS version into a router (assuming the IOS version already in the router is much newer than the IOS version in the image to be uploaded)?

Image source: Cisco 851

Image destination: Cisco 881w
Question by:bobox00
LVL 19

Assisted Solution

Patricksr1972 earned 125 total points
ID: 39851264

I dont believe you can do this. There are probably way to many other naming conventions in place.
If seriously considering, take a copy of the running config from the 881w and compare to the older one, pretty sure you will see BIG differences.
LVL 22

Accepted Solution

Jody Lemoine earned 250 total points
ID: 39860673
The 851 and the 881W share the same interface configuration, so as long as your versions aren't too far apart, you should be good.

Post the first line of a "show version" command on each unit and I can let you know if you're safe.
LVL 17

Assisted Solution

TimotiSt earned 125 total points
ID: 39865589
Are we talking about moving the IOS software image, or the configuration?
LVL 22

Assisted Solution

by:Jody Lemoine
Jody Lemoine earned 250 total points
ID: 39865845
To clarify, you should be able to move the configuration without too much difficulty, but the software images themselves won't be compatible.

Author Closing Comment

ID: 39870753
Thanks for your comments. Will copy and paste the router config after editing in Notepad.

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