Install Guide

speed {10 | 100 | 1000 | 10000 | auto}
NOTE: If you use an active optical cable (AOC), you can convert the QSFP+ port to a 10 Gigabit SFP+ port or 1 Gigabit
SFP port. You can use the speed command to enable the required speed.
6. Optionally, set full- or half-duplex.
INTERFACE mode
duplex {half | full}
7. Disable auto-negotiation on the port.
INTERFACE mode
no negotiation auto
If the speed was set to 1000, do not disable auto-negotiation.
8. Verify configuration changes.
INTERFACE mode
show config
NOTE: The show interfaces status command displays link status, but not administrative status. For both link and
administrative status, use the show ip interface command.
DellEMC#show interfaces status
Port Description Status Speed Duplex Vlan
Tf 1/1 Down Auto Mbit Auto --
Tf 1/2 Up 25000 Mbit Full 2-5
Hu 1/49 Down 100000 Mbit Auto --
Hu 1/50 Down 100000 Mbit Auto --
Hu 1/51 Down Auto Mbit Auto --
[output omitted]
In the previous example, several ports display “Auto” in the Speed field. In the following example, the speed of port 1/1 is set to
100Mb and then its auto-negotiation is disabled.
DellEMC#configure
DellEMC(config)#interface twentyFiveGigE 1/1
DellEMC(conf-if-tf-1/1)#speed 100
DellEMC(conf-if-tf-1/1)#duplex full
DellEMC(conf-if-tf-1/1)#no negotiation auto
DellEMC(conf-if-tf-1/1)#show config
!
interface twentyFiveGigE 1/1
no ip address
speed 100
duplex full
no shutdown
Speed Setting on 25G Interfaces
You can use a 1G or 10G transceiver on a 25 Gigabit Ethernet port to connect to other devices that only support lower speeds.
The ports on the system are grouped in such a way that every four ports are grouped together. There are 12 port groups and
there are four ports per group. All four ports in the same group can only operate at same speed. When you use the ports, ensure
that you connect optics with the same speed in all four ports of that group.
If you connect optics with the speed of 25G, the remaining ports in the port group operate at the same speed. Hence, the first
connected optics in a port group decides the speed of the other ports in the group.
If you connect a 1G or 10G in the same port group, the system displays a message.
In the following example, inserting an optics with 10G speed is disabled as that group already contains three optics with speed
25G:
DellEMC#sh inv med
Slot Port Type Media Serial Number Dell Qualified
------------------------------------------------------------------------------------
1 1 Media not present or accessible
390
Interfaces