Install Guide

The system generates a syslog warning that the change of speed will be applied for all 4 ports in the group and prompts for
confirmation. Following is the sample syslog warning displayed after executing the speed command on the interface:
%Warning:Port with SFP28-DAC inserted on a port group alone will be supported & its
group of 4 ports will be configured with speed 10G.
Proceed with speed 10G [confirm yes/no]: yes
NOTE: You can also connect SFP+ optics in a port group after changing the speed of that port group to 10G.
NOTE: If a port group already operates at 10G, you can connect a SFP28 DAC to the port group and set the speed to
10000.
You can verify the set speed using the show configuration command. Following is the sample show configuration
output:
DellEMC(conf-if-tf-1/25)#show configuration
!
interface twentyFiveGigE 1/25
no ip address
speed 10000
no shutdown
Reverting the speed to 25G
You can revert the speed on SFP28 DAC inserted port that is operating at 10G to 25G. When the speed of a port in a port group
is reverted to 25G, the change is applied on all the ports in the port group.
To change the port back to 25G speed, use the no speed command.
DellEMC(conf-if-tf-1/25)#no speed
NOTE:
When the speed of a port in a port group is set back to 25G, all the other ports in the port group which currently
operates at 10G speed goes down.
FEC Configuration
FEC configurations are available on 100–Gigbit, 50–Gigabit and 25–Gigabit Ethernet interfaces.
To configure FEC, use the following commands.
● Enable FEC.
INTERFACE mode
fec enable {cl91|cl74|cl108}
The CL91 keyword enables RS-FEC on 100G interfaces as per IEEE. The system displays an error message when this is
applied on 25G or 50G interfaces.
The CL74 keyword enables BaseR-FEC on 25G or 50G interfaces as per 25G/50G Ethernet Consortium. The system
displays an error message when this is applied on 100G interfaces.
The CL108 keyword enables RS-FEC for single 25G lane as per IEEE 802.3by. The system displays an error message when
this is applied on 100G interfaces.
To disable FEC, use the no fec enable command.
● Set to default FEC value.
INTERFACE mode
fec default
● Verify the configuration.
INTERFACE mode
show config
example for the fec enable command for a 100G interface.
DellEMC(conf-if-hu-1/49)#fec enable cl91
DellEMC(conf-if-hu-1/49)#show config
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Interfaces