Cisco CatOS and Cisco IOS System differences
Feature	Cisco CatOS	Cisco IOS
Configuration file	Two configuration files:one for the Supervisor Engine, or Network Management Processor(NMP) and one for the MSFC	One configuration file.Use standard Cisco IOS commands such as copy to save the configuration .
Software image	Two images:one for the Supervisor Engine and one for the MSFC in the case of 6500.	One software image.An MSFC bootimage is also required to allow the MSFC to load properly
Default port mode	Every port is a Layer 2 switched port.	Every port is a Layer 3 interface(routed port) on the Cisco 6500 family of switches.
Default port status	Every port is enabled	Every port is in the shutdown state for the Catalyst 6500 family of switches.Some switches allow for an option to configure all interfaces up or down during the automated setup program
Configuration commands format	The command keyword set preceds each configuration command.	Cisco IOS command structure with Global and interface-level commands
Configuration mode	No configuration mode (set, clear, and show commands).	The command configure terminal activates the VLAN configuration mode.
Removing /changing the configuration	Via use of clear, set, or enable/disable commands	Keyword no negates a command