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Software Installation and Upgrade

  • BIOS firmware (SRX5400, SRX5600, and SRX5800 with SPC3)—Starting in Junos OS Release 21.4R1, you can download and install a new version of BIOS by installing the jfirmware package that contains the new BIOS capsule. You do not need to install a new version of Junos OS.

    [See Upgrading BIOS and Firmware (SRX only).]

  • Migration of Linux kernel version—Starting in Junos OS Release 21.4R1, the following devices support the Wind River LTS19 kernel version:

    Platforms Routing Engine Supported

    ACX5448, ACX5448-D, and ACX5448-M


    MX240, MX480, and MX960 RE-S-X6
    MX2020 and MX2010 REMX2K-X8
    MX204 RE-S-1600x8
    MX10003 RE-S-1600x8
    MX2008 REMX2008-X8
    MX10008, and MX10016 RE X10
    PTX1000 RE-PTX1000
    PTX5000 RE-PTX-X8
    PTX10002 RE-PTX10002-60C
    PTX10008 RE-PTX-2X00x4/RE X10
    PTX10016 RE-PTX-2X00x4/RE X10
    QFX10002 RE-QFX10002-60C
    EX9204, EX9208, and EX9214 EX9200-RE2
    EX9251 EX9251-RE
    EX9253 EX9253-RE
    SRX5400, SRX5600, and SRX5800 SRX5K-RE3 (SRX5k RE-2000x6)

    Starting in Junos OS Release 21.4R1, in order to install VM Host image based on Linux WR LTS19, you have to upgrade the i40e NVM firmware to version 7.0 or later.

    [See Upgrading the i40e NVM Firmware on Routing Engines with VM Host Support .]