Administrator Guide

Port-Pipes
A port pipe is a Dell EMC Networking-specific term for the hardware packet-processing elements that handle network traffic to
and from a set of front-end I/O ports. The physical, front-end I/O ports are referred to as a port-set. In the command-line
interface, a port pipe is entered as port-set port-pipe-number.
CR4 Auto-Negotiation
You can configure interface type as CR4 with auto-negotiation enabled. Many DAC cable link issues are resolved by setting the
interface type as CR4. If the CR4 optic fails to come up, use the autoneg option.
To configure interface type as CR4 with auto-negotiation enabled, use the following commands.
● Set the interface type as CR4 with auto-negotiation enabled.
INTERFACE mode
intf-type cr4 autoneg
To disable CR4 auto-negotiation, use the no intf-type cr4 autoneg command.
● Verify the configuration.
INTERFACE mode
show config
DellEMC(conf)#interface hundredGigE 1/1/1
DellEMC(conf-if-hu-1/1/1)#intf-type cr4 autoneg
DellEMC(conf-if-hu-1/1/1)#no intf-type cr4 autoneg
DellEMC(conf-if-hu-1/1/1)#show config
!
interface hundredGigE 1/1/1
no ip address
shutdown
no intf-type cr4 autoneg
Important Points to Remember
● For 10–Gigabit Ethernet interfaces, CR4 auto-negotiation is not applicable.
● For 100-Gigabit Ethernet interfaces, CR4 auto-negotiation is enabled by default.
● For 40–Gigbit, 25–Gigabit and 50–Gigabit Ethernet interfaces, CR4 auto-negotiation is disabled by default.
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
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Interfaces