How to Determine which IOS version is new

Hi
When I have a few IOS versions such as 12.3(2) , 12.3.(3)B and 12.3(2)T how do I know out of these three which one is the newest and which one is the oldest?
Also is there a 12.4 for the 2500 series routers?
Your help is much appreciated!
Many thanks!

Hi Omal,
To some degree you are comparing apples and oranges here. As mentioned by another poster, IOS is released in several different "trains," and it can be hard to compare between them. So, 12.3(2)T is a (T)echnology train, meaning it has new features and bug fixes integrated with each release. 12.3(2) by itself is a mainline train, which generally just has bug fixes committed. Cisco works on both trains at the same time, integrating bug fixes into mainline code, and new features and bug fixes into the T-train. In addition to "T", other letters are often placed at the end of the IOS release for specialized IOS's for certain product lines, such as the Cat 6K or 10000 series.
So, the short answer would be this: I recommend comparing IOS's within their train and not between trains. There can be substantial differences.
Are you looking at a bug and trying to determine where it is fixed, or is this just a general question?
Jeff McLaughlin, CCIE #14023
Cisco Systems

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