Description

This KB provides information about Forward Error Correction (FEC) support on the EX4100 Series.

Solution

FEC is supported for 25G and 10G speed.​

FEC CL91 (RS-FEC) is supported for 25G and FEC CL74 (Fire-Code) and CL108 is supported for 25G port speed​

FEC CL74 is enabled by default for 25G and other FEC values are supported and can be configured​

Interfaces with LR optics doesn’t support FEC


Configuration CLI: #set interface <interface name> gigether-options fec <fec108/fec91/fec74/none>​


Modification History

2026-04-02 : Article Created