Planning to maintain code can be tricky. Tom Hollingsworth points out in this piece, sometimes code is quickly made irrelevant with bygone platforms while others, like COBOL, seemingly stick around forever. Maintaining your own code is challenging enough, but companies like Cisco have to deal with code from numerous acquisitions over time. After maintaining AireOS code for some time, Cisco is now finding ways to migrate to a more modern approach with modular IOS WLC code. Tom is impressed with this approach and think its a model of dealing with similar issues in the future.
