Users Guide

For example, the VLAN contains tagged members with Link MTU of 1522 and IP MTU of 1500 and untagged members with Link MTU of
1518 and IP MTU of 1500. The VLAN’s Link MTU cannot be higher than 1518 bytes and its IP MTU cannot be higher than 1500 bytes.
Port-Pipes
A port pipe is a Dell EMC Networking-specic term for the hardware packet-processing elements that handle network trac 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 congure 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 congure 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 conguration.
INTERFACE mode
show config
Example of the intf-type cr4 autoneg Command
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 Conguration
FEC congurations are available on 100–Gigbit, 50–Gigabit and 25–Gigabit Ethernet interfaces.
To congure 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.
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Interfaces