fec mode rs

Function

The fec mode rs command enables the Reed-Solomon Forward Error Correction (RS-FEC) function on an interface.

The fec mode none command disables the RS-FEC function on an interface.

The undo fec mode command restores the default RS-FEC configuration on an interface.

By default, the medium on an optical interface determines whether the RS-FEC function is enabled on the interface.

Format

fec mode { rs | none }

undo fec mode [ rs | none ]

Parameters

Parameter	Description	Value
rs	Enables the RS-FEC function.	-
none	Disables the RS-FEC function.	-

Views

25GE interface view, 100GE interface view, port group view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

RS-FEC is a bit error correction technology that adds correction information to data packets at the transmit end, and corrects bit errors generated during data packet transmission at the receive end based on the correction information. RS-FEC improves the signal quality, but increases the signal transmission delay. You can disable this function based on requirements to reduce the signal transmission delay.

You can run the display interface command in any view or run the display this interface command in the interface view to check whether the FEC function is enabled on an interface based on the FEC field in the command output.

Precautions

In V200R019C00 and later versions, if the RS-FEC function is enabled on one end, this function also needs to be enabled on the other end to ensure that the RS-FEC status on both ends of the link is the same.
When a 40G optical module or 40G high-speed cable is installed on a 100GE interface, the interface does not support the RS-FEC function.
The FEC function is mutually exclusive with auto-negotiation and the port mode ge command. If FEC has been configured, the FEC configuration will be automatically deleted when auto-negotiation is enabled or the port mode ge command is run.
When 25GE interfaces are interconnected, you are advised to enable FEC on both ends of the link to reduce the transmission bit error rate of the physical link. Otherwise, error packets may be generated.

Example

# Disable the FEC function on 100GE0/0/1.

<HUAWEI> system-view
[HUAWEI] interface 100ge 0/0/1
[HUAWEI-100GE0/0/1] fec mode none