I am really concerned about what IOS I should be using for the CCIE R&S lab. It's a particular problem for me because I'm heavily using the configuration guides and command references to study.
On the certification support website it states 12.4T, whereas on an older 2005 'Ask the Expert' thread 12.4 Mainline is the one. I have a 7200, 3725 and some 2600s in a rack at work. I've also got some 3550s but am less worried as these have the latest IP services code on them.
So far I have been using 12.4(15)T9, although there are later releases such as 12.4(24)T2 for the 7200. Is there a recommended / specific code release, or is it just the latest T train up to 6 months before the date of the lab?
Thanks for any help,