Troubleshooting Tip: Optical Fiber module check

In case of a flapping interface or low level of power for optical fiber modules like SFP or qSFP, those verification steps should be considered to improve the situation:

• Remove the SFP module from the slot.
• Clean any dust.
• Clean any dust on the fiber.
• Clean any dust on the fiber patch or patch panel.
• Use a power meter and light source to test the fiber link's attenuation (loss), it can identify fiber or SFP issue
• Plug the SFP back in and assess.
• Use 'get sys interface transceiver' to check signal level and alarms if any

When using a device with an SFP / RJ45 shared port, it may be necessary to specifically instruct it to use the SFP port.

See Technical Tip: Understanding Shared Media interfaces on the FortiGate for instructions.

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