This article describes how to troubleshoot physical issues on Fortiswitch Port. Errors will point to bad port/cable/transceiver or some physical issue.
Scope
FortiSwitch, FortiGate.
Solution
Commands on FortiGate:
# diag switch-controller switch-info port-stats <switch serial number> portxx
Look for incrementing errors and run the command over and over.
Commands on FortiSwitch:
# diag switch physical-ports port-stats list (port number)
Look for incrementing errors and CRC errors and run command over and over.
