HA graceful upgrade to FortiOS 6.4.8

Use the following steps to upgrade a FortiGate-6000 or 7000 HA cluster with uninterruptible-upgrade enabled from FortiOS 6.2.9 build 1206 or 6.4.6 build 1783 to FortiOS 6.4.8 Build 1823.

You cannot use the information in this section to upgrade a FortiGate-7121F from FortiOS 6.4.6 build 1783 to FortiOS 6.4.8 Build 1823. Instead, see the section, Upgrading a FortiGate-7121F from FortiOS 6.4.6 to 6.4.8.

Enabling uninterruptible-upgrade allows you to upgrade the firmware of an operating FortiGate-6000 or 7000 HA configuration with only minimal traffic interruption. During the upgrade, the secondary FortiGate upgrades first. Then a failover occurs and the newly upgraded FortiGate becomes the primary FortiGate and the firmware of the new secondary FortiGate upgrades.

To perform a graceful upgrade of your FortiGate-6000 or 7000 from FortiOS 6.2.9 or 6.4.6 to FortiOS 6.4.8:

1. Use the following command to enable uninterruptible-upgrade to support HA graceful upgrade:

   config system ha

   set uninterruptible-upgrade enable

   end

2. Download FortiOS 6.4.8 firmware for FortiGate-6000 or 7000 from the https://support.fortinet.com FortiGate-6K7K 6.4.8 firmware image folder.

3. Perform a normal upgrade of your HA cluster using the downloaded firmware image file.

4. Verify that you have installed the correct firmware version. For example, for a FortiGate-6301F:

   get system status
   Version: FortiGate-6301F v6.4.8,build1823,220216(GA)
   ...