Users Guide

Table Of Contents
Forward error correction
Forward error correction (FEC) enhances data reliability.
FEC modes supported in OS10:
CL74-FC Supports 25G and 50G
CL91-RS Supports 100G
CL108-RS Supports 25G and 50G
CL119-RS Supports 400G
off Disables FEC
FEC modes supported for PAM4 breakout speeds in OS10:
CL134-RS Supports 50G PAM4
CL91-RS544 Supports 100G PAM4
CL119-RS, CL91-RS544 Supports 200G PAM4
CL119-RS Supports 400G PAM4
For 25G AOC and SR transceivers, the default FEC mode is CL108-RS. If a peer device does not support CL108-RS, but
supports only CL74-FC, the ports do not come up. For the ports to come up, you must manually configure the FEC mode on the
OS10 switch to CL74-FC using the fec command.
NOTE: OS10 does not support FEC on 10G and 40G.
By default, FEC is enabled in SmartFabric Services mode.
Configure FEC
OS10(config)# interface ethernet 1/1/41
OS10(conf-if-eth1/1/41)# fec CL91-RS
View FEC configuration
OS10# show interface ethernet 1/1/41
Ethernet 1/1/41 is up, line protocol is up
Hardware is Dell EMC Eth, address is e4:f0:04:3e:1a:06
Current address is e4:f0:04:3e:1a:06
Pluggable media present, QSFP28 type is QSFP28_100GBASE_CR4_2M
Wavelength is 64
Receive power reading is
Interface index is 17306108
Internet address is not set
Mode of IPv4 Address Assignment: not set
Interface IPv6 oper status: Disabled
MTU 1532 bytes, IP MTU 1500 bytes
LineSpeed 100G, Auto-Negotiation on
FEC is cl91-rs, Current FEC is cl91-rs
Flowcontrol rx off tx off
ARP type: ARPA, ARP Timeout: 60
Last clearing of "show interface" counters: 00:00:17
Queuing strategy: fifo
Input statistics:
7 packets, 818 octets
2 64-byte pkts, 0 over 64-byte pkts, 5 over 127-byte pkts
0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
7 Multicasts, 0 Broadcasts, 0 Unicasts
0 runts, 0 giants, 0 throttles
0 CRC, 0 overrun, 0 discarded
Output statistics:
15 packets, 1330 octets
10 64-byte pkts, 0 over 64-byte pkts, 5 over 127-byte pkts
0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
15 Multicasts, 0 Broadcasts, 0 Unicasts
0 throttles, 0 discarded, 0 Collisions, 0 wred drops
Rate Info(interval 30 seconds):
Input 0 Mbits/sec, 0 packets/sec, 0% of line rate
Output 0 Mbits/sec, 0 packets/sec, 0% of line rate
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Interfaces