D-Link DES-3200 DDM alarm: RX power exceeded the low warning/alarm threshold caused by a faulty SFP

Question

A D-Link DES-3200-28 B1 switch logged DDM Port X optic module RX power exceeded the low warning/alarm threshold; the optical level looked abnormally low in the switch although the module measured fine when tested standalone. Hardware involved: D-Link DES-3200-28 B1, DDM-capable SFP. Reported symptoms/mssages: DDM ... RX power exceeded the low warning/alarm threshold.

Hardware: D-Link DES-3200-28 B1
Transceivers: DDM-capable SFP
Form factor: SFP

Symptoms / messages:

DDM ... RX power exceeded the low warning/alarm threshold

rackpilot49 · Accepted Answer

Review the readings with show ddm ports status and configuration, confirm DDM support, then replace the faulty SFP and, if needed, disable DDM on the port with config ddm ports X state disable and config ddm ports X shutdown none.

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