Cisco IOS

The Internetworking Operating System (IOS) is a family of proprietary network operating systems used on several router and network switch models manufactured by Cisco Systems. The system is a package of routing, switching, internetworking, and telecommunications functions integrated into a multitasking operating system. Although the IOS code base includes a cooperative multitasking kernel, most IOS features have been ported to other kernels, such as Linux and QNX, for use in Cisco products.

This article is about the Cisco Systems router/switch operating system. For the submarine cable system, see CIOS (cable system). For the mobile OS from Apple Inc., using the licensed trademark of Cisco Systems, see Apple iOS. For the Nintendo Wii operating system, see IOS (Wii Firmware).
Cisco IOS
DeveloperCisco Systems
Working stateCurrent
Source modelClosed source
Latest release15.9(3)M / August 15, 2019 (2019-08-15)
Available inEnglish
PlatformsCisco routers and Cisco switches
Default
user interface		Command-line interface
Succeeded byCisco IOS XE
Official websiteCisco IOS

Not all Cisco networking products run IOS. Exceptions include some Cisco Catalyst switches, which run IOS XE, and Cisco ASR routers, which run either IOS XE or IOS XR; both are Linux-based operating systems. For data center environments, Cisco Nexus switches (Ethernet) and Cisco MDS switches (Fibre Channel) both run Cisco NX-OS, also a Linux-based operating system.

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