How to resolve port intermittent disconnections during EFT testing of a data center switch?

During EFT testing of the data center switch, port interruptions were caused by common-mode transient noise coupling to the PHY chip, leading to link renegotiation. The solutions were: A PBZ1608A-102Z0T ferrite bead (1000Ω@100MHz, 0.5Ω DC resistance) was connected in series with the signal line to absorb high-frequency EFT energy; a 1000pF/2kV high-voltage capacitor was connected in parallel to ground from the transformer center tap to provide a low-impedance discharge path; an ESD3V3D3B TVS (VRWM=3.3V, 12pF junction capacitance) was added to the PHY chip reset pin to ground to clamp transients; simultaneously, firmware optimization extended the link down detection delay from 50ms to 200ms to avoid false positives. Before the rectification, the EFT ±2kV port interruption rate was 80%; after the rectification, the ±4kV interruption rate was 0%.