Highspeed management network port uses an Intel E810 Chipset either on 2 x SFP28 or 2 x QSFP28 port configuration. The following shows how to configure different port speeds in the 2 x QSFP28 port mode.
Step 1) Bios
Press DEL to enter BIOS. Have to be quick as it only accepts for about 5 seconds before continuing on the boot process
Step 2) Intel NIC BIOS
Select Advanced → First Intel Ethernet Network Adapter E810
Step 4) NIC Configuration
Device Level Configuration
Port Option Configuration
The current Configuration mode is shown on the top line
The list of port options is shown below
Tap ENTER on the Port Option (Top Line) and select the port option required, per below
The Selected option is shown at the top, per below
Press ESC until back to the top level menu
Step 5) BIOS Save
Save & Exit → Save Changes and Exit
Step 6) Confirm on the system
Check the interfaces are populated correctly on the system
ifconfig -a | grep phy1[0-7]
Expected output, in 4 × 25G mode shown below
fmadio@fmadio200v4-636:~$ ifconfig -a | grep phy1[0-7]
phy10 Link encap:Ethernet HWaddr B4:96:91:CF:89:A0
phy11 Link encap:Ethernet HWaddr B4:96:91:CF:89:A1
phy12 Link encap:Ethernet HWaddr B4:96:91:CF:89:A2
phy13 Link encap:Ethernet HWaddr B4:96:91:CF:89:A3
fmadio@fmadio200v4-636:~$