This post is about a Catalyst 4948E switch. I was looking on the download page and realized that there are no "GD" versions available. Are the "ED" versions stable? Even if you change "ED" to "GD" in the URL the IOS images are still the same.
Is 15.1 as reliable as 15.0?
My devices are currently on the 12.2 train. Is there anything special to upgrade to one of the 15.x trains? Are the configurations compatible.
Best Answer
You can find information about how Cisco does its releases since IOS 15.0 in this Q&A article:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps10587/ps10591/ps10621/qa_c67_561940.html
Essentially the more feature you add to a product, the more likely you are to introduce new bugs, therefore the "most stable" version of IOS would be the one where feature additions are less frequent.