FEC Configuration Support

Configure Forward Error Correction (FEC) on a port to obtain error control in data transmission over an unreliable or noisy channel. You can configure FEC on 400 Gbps ports, 100 Gbps ports, and 25 Gbps ports.

The following FEC options are supported:

Auto Detect
Disabled
RS-FEC
FC-FEC


FEC Mode	Host Interface Configuration	Peer Interface Configuration	Link Operational Status	LINK FEC Operational Status	Comments
Auto Detect	Auto	Auto	Up	n/a	Operational FEC based on present transceiver
		RS-FEC	n/a	n/a	Link operational status and operational FEC based on present transceiver. If transceiver default have RS-FEC and peer configured as RS-FEC link will comes up and operational FEC is RS-FEC.
		FC-FEC	n/a	n/a
		Disable	n/a	n/a
RS-FEC	RS-FEC	Auto	Depends on present transceiver	Depends on present transceiver	n/a
		RS-FEC	Up	RSFEC/RS528/RS544-2xN	Depends on peer interface support
		FC-FEC	Down	Disable	n/a
		Disable	Down	Disable	n/a
FC-FEC	FC-FEC	Auto	Depends on present transceiver	Depends on present transceiver	n/a
		RS-FEC	Down	Disable
		FC-FEC	Up	FC-FEC
		Disable	Down	Disable
Disable	Disable	Auto	Depends on present transceiver	Depends on present transceiver	n/a
		RS-FEC	Down	Disable
		FC-FEC	Down	Disable
		Disable	Up	Disable

FC-FEC is only supported on 25G ports
Only RS-FEC and AutoFEC work on 400G ports
FEC Disable doesn't work on 4x100G ports
On 4x100G breakout ports, set FEC to RS-FEC and set peer end 100G interface to FEC Disable. The links come up with FEC Disable as the link FEC operational status. (This is because the 100G-DR optic takes in the 100G-PAM4 RS-FEC and converts to 100G-NRZ with no FEC.)

Important

On ports that support FEC configuration, ensure that you configure the same option at both end points. Otherwise, the link does not come up.