Troubleshooting Tip: FortiSwitch MAC Address Flushing

[dwivedis]

Description	This article provides steps to troubleshoot the issue of FortiSwitch deleting MAC addresses.
Scope	FortiSwitch
Solution	A FortiSwitch is designed to optimize network resources. It periodically removes MAC addresses from its address table if: Device Inactivity: The connected device has been idle for a period longer than the configured MAC aging interval. Device Reboot: The connected device restarts, causing the switch to relearn its MAC address. Temporary Workaround: To prevent immediate MAC address deletion, you can temporarily set the MAC aging interval to 0 by executing the below commands: config switch global     set mac-aging-interval 0 end Permanent Solution: For a long-term solution, address the root cause of the issue: Device Replacement: If the device is faulty or unreliable, consider replacing it with a more stable device. Device-Side Troubleshooting: Investigate the connected device to ensure it's functioning correctly and sending regular traffic.