I have a bevy of 2500-series routers all running IOS 12.0(8) or higher.
I also have a brand-new Software Feature Pack from Cisco (Part #55-1284-01) which touts the ability to handle nerdy IPX as well as studly, gorgeous AppleTalk and DECnet. But I opened the box and noticed this Feature Pack is meant to work with IOS 11.2.
Is there a chance it'll work with the IOS 12 images I have installed? Is IOS 12 backward-compatible like that?
Or am I out of luck? If so, what's the part number of the feature pack I need to route AT and DECnet?
It won't work with the IOS 12 images you have installed. It will work only on 11.2
For further information click this link.