Technical Tip: FortiGate may reboot more than 1 time when upgrading to v7.4

The default QoS type can be verified by following the CLI commands.

show full system npu | grep default-qos-type

In FortiGate v7.0 or v7.2, the NPU default-qos-type is shaping.

Since FortiGate v7.4, the default-qos-type has been changed from shaping to policing.

Therefore, when upgrading to v7.4, FortiGate needs to reboot more than 1 time to set the NPU driver setting same as the CLI setting.

Starting from v7.4.8 GA  and v7.6.1 3 GA, the option for 'default-qos-type' can only be set to 'policing'. This is to deal with a known issue where the Queuing based Traffic Management QTM module in NP7 models is responsible for shaping, may hang when receiving a packet with MTU size 6000 or larger, causing FortiOS not to honor fragmentation.

config system npu
    set default-qos-type policing <---
end

Details related to this change can be found on the following release notes link: Changes to NP7 traffic shaping.