I have 2 2801 routers that need to run BGP. Unfortunately my boss bought them with the advanced security version of IOS on them and not the advanced IP services I need to be able to run BGP. I was able to download the advances IP services version of the code for my routers but am nervous about loading it on to the router until I find out if it will work. Do I have to purchase new licenses for the routers to switch from advanced security to advance IP services IOS?
Technically, you don't need license to run Adv IP image as long as memory/flash size meet the minimum requirement for this image.
But from sale side, I don't know if you need do anything. Please check with your local cisco partner for this.