CatOS

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CatOS (Catalyst Operating System) is Cisco Systems' obsoleted Unix-like operating system for many of their Catalyst-brand of legacy network switches. Originally called "XDI" ^[1] by the switching company Crescendo, Cisco renamed it to CatOS when they acquired Crescendo in the mid-1990s. CatOS runs on Switches such as 1200, 4000, 4500 5000, 5500 6000, 6500 series. CatOS still runs on Cisco high end switches such as their flagship Catalyst 6509, which can run in either Native or Hybrid mode. Native is where the switch runs only Cisco IOS and hybrid is where the NMP runs CatOS and the Route processor/MSFC runs IOS.

1. ^ http://www.ciscopress.com/articles/article.asp?p=25172&rl=1