Software Installation and Upgrade
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Base OS update (ACX710, EX Series, MX Series, NFX Series, PTX Series, QFX Series, SRX1500, SRX4100, SRX4200, SRX4600, SRX5400, SRX5600, SRX5800, and vSRX3.0)—Starting in Junos OS Release 24.2R1, Junos OS uses the FreeBSD main base OS. This upgrade provides improved security and better performance. In earlier releases, Junos OS used the FreeBSD Release 12 base OS.
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Support for USB Autoinstallation (NFX150, NFX250, and NFX350 )—Starting in Junos OS Release 24.2R1, you can autoinstall the Junos OS image by inserting a USB flash drive containing the image and configuration into the USB port of NFX series devices. You can autoinstall the image by configuring the
set system services usb-auto-install
command.