Troubleshooting Tip: High CPU usage on bcm.user after the upgrade to v6.4.x, v7.0.x and v7.2x

[Adryan_you]

Description	This article describes how to resolve high CPU issues on bcm.user after upgrading to v6.4.x, v7.0.x, and v7.2.x.
Scope	FortiGate.
Solution	After upgrading FortiGate firmware from v6.4.x, v7.0.x, and v7.2.x, the high CPU issue occurred. Check the FortiGate CPU usage: get sys performance status If the softIRQ stats are high, that indicates network looping may occur. Check and confirm the user has switched the interface config. config system switch-interface show Enable STP-Forward in all the interfaces that are under the switch-interface setting: config sys interface     edit <port>         set stpforward enable end Check the FortiGate CPU again. The 'softIRQ' stats should drop. bcm.user process is in charge of controlling the internal switch of the equipment. This process needs to run some routines to keep the equipment kernel updated with information on the link statuses as well as statistical data in real-time internally (which can be used for new functionalities in versions v6.4.x, v7.0.x and v7.2.x, so a consumption between 10-20% in a core is expected.