ExtremeXOS

ExtremeXOS is the software or the network operating system used in newer Extreme Networks network switches.^[1] It is Extreme Networks second generation operating system after the VxWorks based ExtremeWare operating system.

ExtremeXOS
Developer	Extreme Networks
OS family	Unix-like
Working state	Current
Source model	Closed source and partly Open source
Initial release	version 10.1: February, 2004
Latest release	v33.3.1.4 / 16.04.2025
Available in	English
Supported platforms	Extreme Networks Network switches
Kernel type	Monolithic (Linux)
Default user interface	Command-line interface
Official website	www.extremenetworks.com/products/extreme-xos.aspx

ExtremeXOS is based on the Linux kernel and BusyBox.^[2] In July 2008 legal action was taken against Extreme Networks due to alleged violation of the GNU General Public License.^[3] Three months later the lawsuit was settled out of court.^[4]