Since the creation of the first Internetwork Operating System (IOS) for the first Cisco router, Cisco have followed the same method, each model of router having it’s own version and release built. Major versions were given the numbering system 12.0. Changes to these versions were then numbered 12.1, 12.2, etc. Within those versions were releases fixing bugs and adding support for modules and other features, such as 12.1(1a).
Unfortunately, as support was added and bugs fixed, the releases were split into trains so each model had it’s own IOS, which led to various . . .
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