What are the differences between CatOS and IOS?

[abhdivak]

Hello All,

What are the differences between CatOS and IOS?  Are IOS XE, XR belongs to IOS ?

Thanks,

Abhijith

[Mark Malone]

Hi best to have a read of these 2 docs explains the diffs , CatOS is what they had years ago before IOS , XR was made for high end routers ASRs9,CRS , XE was made for ASR ,1000s, 3850s and 3650s XR and XE are part of IOS architecture , CatOS is now legacy

http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-xe-3sg/QA_C67-622903.html

https://supportforums.cisco.com/sites/default/files/attachments/document/files/catos-vs-ios.pdf

[abhdivak]

Hi mark,

Thank you so much. That means IOS XE is used only for cisco 3650, 3850 stack switches and ASR 1000 series , right ?

Thanks,

Abhijith

[Mark Malone]

Hi ios-xe also used on the cisco wireless controllers the wlcs , it may be on others I just know for certain its on those models

If you checke

 the platforms on Cisco website you will be able to see what ios or ios-xe version they use by the image you would download , as the ios-xe contain the ios version as well as there own ios-xe version in the code

3.16.2 is ios xe and 15.5.3 is IOS

isr4300-universalk9.03.16.02.S.155-3.S2-ext.SPA.bin