Administrator Guide

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
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.
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-1/1/1)#fec enable
DellEMC(conf-if-hu-1/1/1)#show config
!
interface hundredGigE 1/1/1
no ip address
shutdown
intf-type cr4 autoneg
fec enable
Important Points to Remember
• For 10–Gigabit and 40–Gigabit Ethernet interfaces, FEC configurations are not applicable.
• For 100-Gigabit Ethernet interfaces, CR4 auto-negotiation is enabled by default. You can enable or disable FEC and auto negotiation
irrespective of each other.
• For 25–Gigabit and 50–Gigabit Ethernet interfaces, FEC is disabled by default. You can enable or disable FEC and CR4 auto-
negotiation simultaneously.
• To view CR4 auto-negotiation and FEC configurations for 100–Gigabit Ethernet interfaces, use the show interfaces command.
• For 25–Gigabit and 50–Gigabit Ethernet interfaces, There is no support for CL73-AN (auto negotiation), CL72-LT (link training), and
CL74-FEC (BaseR-FEC or firecode-FEC).
DellEMC#show interfaces hundredGigE 1/1/1
hundredGigE 1/1/1 is up, line protocol is up
Hardware is DellEMCEth, address is 00:12:32:12:42:13
Current address is 00:12:32:12:42:13
Pluggable media present, QSFP28 type is 100GBASE-CR4-3M
AutoNegotiation is OFF
Forward Error Correction(FEC) is ON
Wavelength is 64nm
Interface index is 2101774
Internet address is not set
Mode of IPv4 Address Assignment : NONE
DHCP Client-ID :001232124213
MTU 9416 bytes, IP MTU 9398 bytes
LineSpeed 100000 Mbit
Flowcontrol rx off tx off
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interface" counters 00:31:23
Queueing strategy: fifo
Input Statistics:
32992398774 packets, 2243483116632 bytes
0 64-byte pkts, 32992398774 over 64-byte pkts, 0 over 127-byte pkts
0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
0 Multicasts, 0 Broadcasts, 32992398774 Unicasts
388
Interfaces