DeveloperExtreme Networks
OS familyUnix-like
Working stateCurrent
Source modelClosed source and partly Open source
Initial releaseversion 10.1: February, 2004
Latest release16.1.3.6 Patch4 (21.1.1 Patch2 for Gen2 Devices) / 05.05.2016 (02.05.2016)
Available inEnglish
PlatformsExtreme Networks Network switches
Kernel typeMonolithic (Linux)
user interface
Command-line interface
Official websitewww.extremenetworks.com/products/extreme-xos.aspx

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 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]


  1. ^ ExtremeXOS Network Operating System, Extreme Networks.
  2. ^ Extreme Networks puts Linux to work in routing switch, Network World, 2004-05-03.
  3. ^ Today's SFLC/BusyBox target: Extreme Networks, Inc, Linux Weekly News.
  4. ^ BusyBox Developers Settle Case With Extreme Networks, Software Freedom Law Center.