Figuring out IOS release numbers

Answered Question
Feb 15th, 2006
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Hey there,


I'm an auditor trying to figure out EOE/EOL IOS releases. I think I have issues with some of the releases we have. But before I make that comment on an audit I want to be certain.


I have a number of 2610XM's with 12.2.(13)T16. I think that version has reached it's EOE based on Product release lifecyle. Would this release be part of the 12.2T family? Any help would be fantastic.


Thanks


Jamie

Correct Answer by jarathbu about 11 years 6 months ago

Hello,


Early in Cisco’s history, the need for at least two trains for releasing Cisco IOS Software emerged:


1) A train for bug fixes—mainline

2) A train for bug fixes and new features—T train

With two trains, Cisco could introduce new features in a Cisco IOS release from one train without affecting the code base of the other train.



Mainline trains, such as 12.2, are built from previous generation T trains, such as 12.1T. Mainline trains, such as 12.2, are parents of other trains, such as 12.2T



Additional information regarding IOS can be found in the following white paper:


Cisco IOS Reference Guide

http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_white_paper09186a008018305e.shtml



Hope this answers your question.



Regards



Correct Answer by thisisshanky about 11 years 6 months ago

You may need CCO access to view the first link.

You are correct. According to the last link I posted, it says 12.2T train EOE was Nov 2004. T stands for the T train.


HTH


PS: please remember to rate posts!

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thisisshanky Wed, 02/15/2006 - 08:57
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I am still able to download this IOS. Here is the list of retired IOSes.


http://www.cisco.com/kobayashi/library/iosplanner/retired.shtml


This list does not show the IOS you have listed.


Even though the link below shows 12.2T train was EOE Nov 2004.


http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/prod_bulletin0900aecd801eda8a.html


EOE means they wont make any patches, updates to this train any more.


You may still find it for download, as long as the version is not deferred.


I would suggest you migrate to 12.4 if you want support on any issues.


Sankar


PS: please remember to rate replies!

jamiegaylord Wed, 02/15/2006 - 12:04
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Thanks for the link. I thought it was general information page but apparently I don't have access to it. Does the "T" at the end mean train?


To clarify, just because I can download the IOS does not mean that fixes are available correct?

Correct Answer
thisisshanky Wed, 02/15/2006 - 12:10
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  • Purple, 4500 points or more

You may need CCO access to view the first link.

You are correct. According to the last link I posted, it says 12.2T train EOE was Nov 2004. T stands for the T train.


HTH


PS: please remember to rate posts!

Correct Answer
jarathbu Wed, 02/15/2006 - 14:01
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  • Bronze, 100 points or more

Hello,


Early in Cisco’s history, the need for at least two trains for releasing Cisco IOS Software emerged:


1) A train for bug fixes—mainline

2) A train for bug fixes and new features—T train

With two trains, Cisco could introduce new features in a Cisco IOS release from one train without affecting the code base of the other train.



Mainline trains, such as 12.2, are built from previous generation T trains, such as 12.1T. Mainline trains, such as 12.2, are parents of other trains, such as 12.2T



Additional information regarding IOS can be found in the following white paper:


Cisco IOS Reference Guide

http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_white_paper09186a008018305e.shtml



Hope this answers your question.



Regards



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