![]() ![]() Instead the process must make a kernel call before other processes get a chance to run. ![]() There is no memory protection between processes and IOS has a run to completion scheduler, which means that the kernel does not pre-empt a running process. This means that all processes have direct hardware access to conserve CPU processing time. Command-line interfaceĬisco IOS has a monolithic architecture, owing to the limited hardware resources of routers and switches in the 1980s. For the Nexus switches Cisco developed NX-OS, which is similar to IOS, except that it is Linux-based. Cisco eventually introduced the native mode for chassis, so that they only run one operating system. In early modular chassis network switches from Cisco, modules with layer 3 routing functionalities were separate devices that ran IOS, while the layer 2 switch modules ran CatOS. #Cisco ios xe to cisco ios version number mapping seriesThe Cisco Catalyst series would for some time run the CatOS. The company acquired a number of young companies that focused on network switches, such as the inventor of the first Ethernet switch Kalpana, and as a result Cisco switches did not run the IOS. When IOS was developed, Cisco Systems' main product line were routers. Through modular extensions IOS has been adapted to increasing hardware capabilities and new networking protocols. The IOS network operating system was developed in the 1980s for routers that had only 256 kB memory and low CPU processing power. ![]()
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