configure ports forward-error-correction

configure ports port_list forward-error-correction [off | on [cl74 | cl91]]


Enables/disables IEEE Forward Error Correction (FEC) Clause 74 or 91 modes.

Syntax Description

port_list List of ports to enable/disable FEC modes on.
forward-error-correction Configures port FEC mode.
off Disables all FEC modes (default).
on Enables FEC modes.
c174 Enables/disables FEC IEEE Clause 74.
c191 Enables/disables FEC IEEE Clause 91.


FEC is not enabled by default.

Usage Guidelines

This command allows you to enable/disable Clause 91 or Clause 74 (exclusively) on a per-port basis regardless of speed/type.

FEC gives the receiver the ability to correct errors without requiring a reverse channel to request retransmission of data, but at the cost of a fixed, higher forward channel bandwidth. Some devices require this to interoperate.


The following example enables FEC Clause 91 on port 1:

# configure ports 1 forward-error-correction on cl91
The following example turns off FEC on port 1:
# configure ports 1 forward-error-correction off


This command was first available in ExtremeXOS 22.3.

Platform Availability

This command is available on the ExtremeSwitching X465 (VIM-4YE),X590, X670-G2, X690, X695, X870, 5320, 5420, and 5520-VIM-4YE switches.