FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
This article describes the issue of FortiSwitches going offline after updating the FortiGate from v7.6.2 to v7.6.4. The article provides a step-by-step solution to resolve this issue.
Scope
FortiGate, FortiSwitch.
Solution
To resolve the issue of FortiSwitches going offline after updating the FortiGate from v7.6.2 to v7.6.4, follow these steps:
Enable the Spanning Tree Protocol (STP) setting on the hardware-switch FortiLink interface.
To do this, go to
config system interface
edit <FortiLink_hardware_switch_interface>
set stp enable
end
After enabling STP, the FortiSwitches should come back online.
Then, update the first FortiSwitch to v7.6.4.
After updating the first FortiSwitch, the switches may go offline again.
To resolve this, disable STP on the FortiLink interface by running the command set stp disable.
Once STP is disabled, the FortiSwitches should come back online, and you can update the remaining switches to the highest possible version.
