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You can use ISSU to upgrade from an ISSU-capable software release to a later release.To perform an ISSU, your device must be running a Junos OS release that supports ISSU for the specific platform. In cases where ISSU is not supported or recommended, while still downtime during the system upgrade must be minimized, the minimal downtime procedure can be used, see knowledge base article KB17947.Ensure the node with older image is primary for all RGs 4. Reboot the rolled back node No service downtime occurs, because the primary node continues to provide required services.
Ensure the node with older image is primary for all RGs 4. Reboot the rolled back node Starting with Junos OS Release 17.4R1, the hold timer for the initial reboot of the secondary node during the ISSU process is extended from 15 minutes (900 seconds) to 45 minutes (2700 seconds) in chassis clusters on SRX1500, SRX4100, SRX4200, and SRX4600 devices.
To set the redundancy group priority and enable the The following problems might occur during an ISSU upgrade.
You can identify the errors by using the details in the logs.
The primary node times out if the secondary node fails to complete the cold synchronization.
Detailed console messages are displayed that you manually clear existing ISSU states and restore the chassis cluster.
Note that this method works for all redundancy groups except redundancy group 0.