High Quality Content by WIKIPEDIA articles! 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" by the switching company Crescendo Communications, Inc., Cisco renamed it to CatOS when they acquired Crescendo in late 1993. 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 6500 series, which can run in either Native or Hybrid mode. Native is where the switch runs only Cisco IOS and hybrid is where the NMP (Switch Processor) runs CatOS and the MSFC (Route Processor) runs IOS. A Unix-like (sometimes shortened to *nix to circumvent trademark issues) operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification.

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