CatOS

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CatOS (Catalyst Operating System) is Cisco Systems' obsoleted operating system for many of their legacy network switches. CatOS is the UNIX like Kernel Cisco acquired during its acquisition of the Switching Company Crescendo. 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 and 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.