What's the difference?

Unanswered Question
Nov 16th, 2009

Hi NetPro

What's the difference between Cisco IOS








I have this problem too.
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jmecklenburg Mon, 11/16/2009 - 06:56

Hi Jo..

Thanks for your answer, but this link talk about specific Release, i'am ask for the difference between Major Release.

wandering_997 Mon, 11/16/2009 - 23:13

hi Javier,

I found some information from below link, and you can find more detailed info as you clicking into the sub-links.


* Cisco IOS: Cisco IOS Software is the world's premiere network infrastructure software, delivering seamless integration of technology innovation, business-critical services, and hardware support

* Cisco IOS XE Software: Software for optimal services enablement used at the Enterprise and Service Provider Edge

* Cisco IOS XR Software: The foundation for network and service convergence

* Cisco NX-OS: The data center-class operating system for the virtualized data center



Joseph W. Doherty Tue, 11/17/2009 - 04:01

In general, 12.4 is the "mainline" (no suffix) release. 12.4T is the "test" release (which will become the next mainline version - now out and version 15.0 I believe). All the others are special purpose releases which often provide some new feature for software or hardware not found in "mainline" but without all the new features found in "test". To determine actual differences between releases (or even within a version's releases, e.g. 12.4.5T vs. 12.4.20T) you need to consult the feature navigator tool and/or release notes.

jeremyotsap Fri, 05/04/2012 - 10:33

I know my post is a couple years late, but my question is somewhat related. I realize there are different features; for instance 12.4YB supports most of the MPLS TE, while the 12.4 mainline supports more MPLS VPN features. (This is just a small subset). My question is this: from a high level are these versions made to target a specific customer? Service provider vs data center?

Thoughts? Elaboration? Is YB more ISP oriented?

Thanks in advance

Joseph W. Doherty Fri, 05/04/2012 - 10:59


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Cisco would be able to best answer that, but various release trains do seem to be oriented toward particular platforms and/or particular market segments.  I believe over the last couple of years Cisco has been trying to cut back on all the various release trains.  Now they seem more oriented just toward particular platforms.  (Of course, the platforms, themselves, often are oriented toward certain market segments.)


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