FortiGate
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.
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Staff
Article Id 191816
Description
The Switch Controller feature in FortiOS allows the FortiGate to control the configuration on FortiSwitches.  Software switches allow traffic to be bridged between physical and virtual interfaces on the FortiGate.

There is currently a known issue where disabling the switch controller feature has the side-effect in FortiOS 5.2 of disrupting traffic flow involving software switches until the FortiGate is rebooted.

This issue is resolved starting in FortiOS 5.4.1 (as tracked in bug id 0274130).

Note: Disabling wireless controller also disables switch controller.  A warning to this effect is provided in the FortiGate CLI.
FGT #  config system global
FGT (global) #      set wireless-controller disable
Switch-controller and extender-wan will also be disabled.

Solution
Reboot the FortiGate after disabling Switch Controller or Wireless Controller.

Related Articles

Technical Note: Comparison of FortiGate Switch Mode configs between v5.2 and v5.4

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