Configuring Fec - H3C S6850 Series Configuration Manual

between UP and DOWN, traffic switches between active and standby links. To solve this problem,
configure this feature on the interface.
With this feature enabled on an interface, when the interface goes down, the system enables link
flapping detection. During the link flapping detection interval, if the number of detected flaps reaches
or exceeds the link flapping detection threshold, the system shuts down the interface.
Restrictions and guidelines
This feature takes effect only if it is configured in both the system view and interface view.
The dampening , link-delay , and port link-flap protect enable commands are
mutually exclusive on an Ethernet interface.
To bring up an interface that has been shut down by link flapping protection, execute the undo
shutdown command.
In the display interface command output, the Link-Flap DOWN value of the Current state
field indicates that the interface has been shut down by link flapping protection.
Procedure
1. Enter system view.
system-view
2. Enable link flapping protection globally.
link-flap protect enable
By default, link flapping protection is disabled globally.
3. Enter Ethernet interface view.
interface interface-type interface-number
4. Enable link flapping protection on the Ethernet interface.
port link-flap protect enable [ interval interval | threshold
threshold ] *
By default, link flapping protection is disabled on an Ethernet interface.

Configuring FEC

About FEC
The forward error correction (FEC) feature corrects packet errors to improve transmission quality. It
attaches correction information to a packet at the sending end, and corrects error codes generated
during transmission at the receiving end based on the correction information. You can set the FEC
mode as needed.
Restrictions and guidelines
On the switch series, 25-GE interfaces and 100-GE interfaces support FEC. However, only 25-GE
interfaces operating at 25 Gbps support configuring FEC at the CLI.
Make sure you set the same FEC mode for both interfaces of a link.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Set the FEC mode of the Ethernet interface.
port fec mode { auto | base-r | none | rs-fec }
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