Extreme 9920 software Operating System (TierraOS) is built using the standard ONLPv2 procedure. Installation of Extreme 9920 software is done using Open Networking Install Environment (ONIE) standard.
ONIE is the combination of a boot loader and a small operating system for bare metal network devices that provides an environment for automated provisioning or recovery of the device. The Extreme 9920 device boots the software from the images stored on the hard disk of the device. ONIE also provides mechanisms to re-install or update the software if the normal software download process fails.
The process supported by the system firmware upgrade command is not affected by this feature. The Extreme 9920 software is not updated to the snapshot partition during the normal upgrade process.