All switches and routers are using an Operating System to perform their operations. Some vendors have created their own OS, other are using an already existing OS and modify it to their needs. Here is a list of vendors, their Operating System and on which OS it is built on (if any):
Cisco:
IOS is in-house developed
IOS-XR is based on QNX (used only on Cisco 12000 series, CRS-1 Core Router and Catalyst 6500)
Extreme Networks:
EXOS is based on Linux
ExtremeWare not disclosed
Force10:
FTOS is based on NetBSD
Foundry:
IronWare is in-house developed
Juniper:
JunOS is based on FreeBSD
Please don't hesitate to send me an e-mail at blog@daxy.net if you have other or more information.
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