Huawei 25GE ports: 10G SFP+ and short copper cables need RS-FEC enabled or the interface stays down

Question

On Huawei switches with 25GE ports the poster asked about using SFP+ transceivers and copper cables; per the troubleshooting docs, when a non-1 m copper cable is connected to a 25GE interface the RS-FEC function must be enabled or the interface goes Down, and mixing different optical modulles at the two ends can prveent communication.

Hardware: Huawei 25GE switch
Transceivers: 10G SFP+, 25G copper cable
Form factor: SFP+, SFP28

Symptoms / messages:

25GE interface Down with copper cable
communication fails with mismatched optics

waverunner21 · Accepted Answer

Enable RS-FEC on 25GE interfaces ussing non-1 m copper cables, and use matching optics at both ends; otherwise the interface stays down.

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