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Upgrade Individual Devices in a Chassis Cluster Separately

This topic explains how Firewalls in a chassis cluster can be upgraded individually, one at a time. Certain models support sequential upgrades by leveraging failover mechanisms and In-Service Software Upgrade (ISSU) capabilities. This approach allows traffic to shift to the peer device during the upgrade process, thereby minimizing downtime and reducing the operational impact on network services.

To upgrade each device in a chassis cluster separately:

During this type of chassis cluster upgrade, each device is upgraded one at a time. A brief service disruption of approximately 3 to 5 minutes may occur during the failover process.

  1. Load the new image file on node 0.
  2. Perform the image upgrade without rebooting the node by entering:
  3. Load the new image file on node 1.
  4. Repeat Step 2.
  5. Reboot both nodes simultaneously.

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