Troubleshooting Tip: Double reboot on NP7 devices on upgrade to 7.6.5+ due to default_qos_type / vlan-lookup-cache

Description

This article describes double reboot behavior on NP7 devices after an upgrade to version 7.6.5 or above, triggered by the default_qos_type config and/or vlan-lookup-cache config.

Scope

NP7 FortiGate devices upon upgrading to 7.6.5 or higher.

Solution

On an upgrade of NP7 FortiGate device to version 7.6.5 or higher, the device could go through a double reboot. This is triggered by either a reconfiguration of the default_qos_type or an invalid vlan-lookup-cache. Those settings changed default values, as indicated in the changes in default behavior (FortiOS 7.6.5 release notes). It is also mentioned in the special notices. 

The list of all NP7 devices can be found on the NP7 architectures page. Note however that not every device will encounter the same issue.

On the console connection on the upgrade from 7.4 to 7.6.5 or higher, the following logs may appear (or a variation that only shows default_qos_type or vlan-lookup-cache):

Firmware upgrade in progress ...
Done.




The system is going down NOW !!



Please stand by while rebooting the system.

Restarting system

FortiGate-1800F (22:05-01.21.2021)
Ver:05000008
Serial number:FG180FTK20900381
RAM activation
CPU(00:00050657 bfebfbff): MP initialization 
CPU(01:00050657 bfebfbff): MP initialization 
CPU(02:00050657 bfebfbff): MP initialization 
CPU(03:00050657 bfebfbff): MP initialization 
CPU(04:00050657 bfebfbff): MP initialization 
CPU(05:00050657 bfebfbff): MP initialization 
CPU(06:00050657 bfebfbff): MP initialization 
CPU(07:00050657 bfebfbff): MP initialization 
CPU(10:00050657 bfebfbff): MP initialization 
CPU(11:00050657 bfebfbff): MP initialization 
CPU(12:00050657 bfebfbff): MP initialization 
CPU(13:00050657 bfebfbff): MP initialization 
CPU(14:00050657 bfebfbff): MP initialization 
CPU(15:00050657 bfebfbff): MP initialization 
CPU(16:00050657 bfebfbff): MP initialization 
CPU(17:00050657 bfebfbff): MP initialization 
Total RAM: 24560MB
Enabling cache...Done.
Scanning PCI bus...Done.
Allocating PCI resources...Done.
Enabling PCI resources...Done.
Zeroing IRQ settings...Done.
Verifying PIRQ tables...Done.
Boot up, boot device capacity: 28626MB.
Press any key to display configuration menu...
.............................

Reading boot image 6009709 bytes.
Initializing firewall...
System is starting...
The config file may contain errors. 
Please see details by the command 'diagnose debug config-error-log read'.

reconfig default_qos_type config due to new config reload.
Invalid vlan-lookup-cache setting is detected.
Applying the default setting...
Please wait for reboot...

System will reboot to make some changes effective.


x0bsf02mar01 login: 



The system is going down NOW !!



Please stand by while rebooting the system.

Restarting system

When verifying the configuration values before and after the upgrade, they are still the same. Nothing changes with the configuration.