Consideration when upgrading Cisco IOS Software
Posted October 15th, 2008 by Matt ShadboltUpgrading your IOS is generally a pretty strait forward task. There is one consideration you should make before attempting to upgrade your router – the required “feature set”.
If you install an IOS image that doesn’t include some of the features included in your previous IOS version you may find that some functionality is lost.
You can quickly check the feature set by running the show version command on your router. You will find the feature set version either in the System Image file name (ie “flash:c1234aa-advsecurityk9-mz”) or you can find it on the very first line of the output (ie “(c1234aa-advsecurityk9-mz)” ).
Once you know your current feature set, just find the new IOS image that complies with the current feature set and you should be good to go.
Tags: cisco, Cisco IOS Software, Feature Set, IOS
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