The switch port may be faulty, or the optical transceiver may be overheated. SFP standards can vary from port to port, even on the same switch front panel. Therefore, the presence of an SFP in the compatibility matrix does not guarantee the SFP compatibility with a given interface, so it must be verified against the hardware. We are experiencing issues with our optical ports between. Hello, from your output I can't see which type of QSFP you have installed, your QFX discovers. @LapointeMichel that known EX2300. This article describes steps to perform when SFP/SFP+ fiber link is not coming up. Scope FortiSwitch and FortiGate. Download the file 'Compatible Transceivers' from the link below, or. This is for Layer 1 connectivity, if the link shows "up/up," but expected traffic is not passing, other configuration issues may be present. So has anyone an idea why the SFP connections / interfaces are acting so weirdly? Or do I miss anything? I am sitting on that issue since two days now, searching the. Tip #2: Why the LED of the switch slot does not light up after inserting the transceiver? It may cause by two reasons: compatibility issues and physical connection issues.