Junos OS

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  • 1.  How to do ISSU on MX480 with VMHOST REs?

    Posted 01-17-2024 14:36

    We have an MX480 with redundant RE-S-2X00x6 running Junos 21.4R2-S2.5.  For field upgrades, we are testing ISSU and there seems to be a dilemma. With these RE's being vmhost versions, the required upgrade command is 'request vmhost software add <package-name> no-validate reboot'. 

    However when attempting ISSU, the required command is 'request vmhost software in-service-upgrade <package-name> reboot' and there isn't a 'no-validate' option available.  The upgrade fails with an error stating no-validate is required, of course. All required sync and NSR features are deactivated/disabled in advance per Junos documentation.

    Is ISSU supported with vmhost REs? If so, what is the process to complete it successfully in a production router?

    Thank you,



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    David Pascarella
    Sr. Networking Specialist
    L3Harris Corporation
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  • 2.  RE: How to do ISSU on MX480 with VMHOST REs?

    Posted 02-21-2024 13:00

    I found the solution to this issue.  It turns out the 'no-validate' requirement becomes a hidden command after invoking 'in-service-upgrade'.  From the master RE, issue the following upgrade commands with active GRES between redundant RE's, of course.

    {master}

    root@R1_RE0>request vmhost software in-service-upgrade /var/tmp/<package-name> no-validate | reboot

    I tested and reproduced this operation several times successfully in the MX-Series systems using vmhost REs.



    ------------------------------
    David Pascarella
    Sr. Networking Specialist
    L3Harris Corporation
    ------------------------------