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Software Installation and Upgrade

  • Zero-touch provisioning (ZTP) with IPv6 support (QFX5120-32C)—Starting in Junos OS Release 21.1R1, you can use a DHCPv6 client and ZTP to provision a QFX5120-32C switch.. During the bootstrap process, the device first uses the DHCPv4 client to request for information regarding the image and configuration file from the DHCP server. The device checks the DHCPv4 bindings sequentially. If there is a failure with one of the DHCPv4 bindings, the device continues to check for bindings until provisioning is successful. However, if there are no DHCPv4 bindings, the device checks for DHCPv6 bindings and follows the same process as for DHCPv4 until the device is provisioned successfully. Both DHCPv4 and DHCPv6 clients are included as part of the default configuration on the device.

    The DHCP server uses DHCPv6 options 59 and 17 and applicable suboptions to exchange ZTP-related information between itself and the DHCP client.

    [See Zero Touch Provisioning.]

  • Support for signed third-party application installation (MX10003, MX10008, QFX5210, QFX10002, and QFX10008 routers with VM host architecture)—Starting in Junos OS Release 21.1R1, you can install signed third-party application installation and carry over the application between upgrades.

    The backup of third-party package occurs during upgrade. Hence, the package is restored even if the installed package is deleted or uninstalled before a reboot. However, as the third party package restoration depends on the contents saved on the disk during upgrade and the configuration to allow the package to be installed, restoration is not possible when

    • Configuration is removed after upgrade
    • Content is removed due to deletion by configuring request vmost zeroize command

    On platforms where jinstall-host.tgz images are installed, the minimum space required for the backup is 250MB. After backup, if the free space available is less than 200MB, the backup would be deleted to make space for upgrade. On platforms where junos-vmhost images are installed, the minimum space required for backup of third party unbundled packages is 1200MB. After the backup, if the free space is less than 512MB, the backup would be deleted to free up space for upgrade.

    [See Installing, Upgrading, Backing Up, and Recovery of VM Host.]