PowerEdge: Mellanox CX4 LX Driver DCBXMode configuration changes after upgrade to 1.80

Summary: The DCBXMode configuration in the Mellanox CX4 LX network adapter advanced properties can be configured to one of the two values -- 'Firmware in charge' and 'Host in charge'. 'Firmware in charge' is the default value. ...

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Symptoms

The DCBXMode configuration in the Mellanox CX4 LX network adapter advanced properties can be configured to one of the two values -- 'Firmware in charge' and 'Host in charge'. 'Firmware in charge' is the default value.

As a part of the Dell Storage Spaces Direct Ready Node deployment, we recommend that you change this setting to 'Host in charge' and disable DCBX willing globally in the host OS.

#Disable DCBX willing
Set-NetQoSDCBXSetting -Willing $false -Confirm:$false

#set Mellanox dcbxmode to host in charge; requires OOB Mellanox driver
Set-NetAdapterAdvancedProperty -Name 'SLOT 1 PORT 1' -DisplayName 'DcbXMode' -DisplayValue 'Host in charge'
Set-NetAdapterAdvancedProperty -Name 'SLOT 1 PORT 2' -DisplayName 'DcbXMode' -DisplayValue 'Host in charge'

Cause

If you are using an older version of (than version 1.80) Mellanox driver and upgrade to version 1.80, the DCBXMode configuration setting changes to the default value which is 'Firmware in Charge'.

This is a change from Mellanox CX4 LX Driver version 1.80.

Resolution

 You can use the Set-NetAdapterAdvancedProperty cmdlet to set the value of DCBXMode property back to 'Host in charge'.

Affected Products

OEMR R440, OEMR R540, OEMR R640, OEMR R6415, OEMR R740, OEMR R740xd, OEMR R7415, OEMR R7425, OEMR R840, OEMR R940, OEMR R940xa, OEMR T640, Poweredge C4140, PowerEdge C6420, PowerEdge R440, PowerEdge R540, PowerEdge R640, PowerEdge R6415 , PowerEdge R740, PowerEdge R740XD, PowerEdge R7415, PowerEdge R7425, PowerEdge R840, PowerEdge R940, PowerEdge R940xa, PowerEdge T640 ...
Article Properties
Article Number: 000175482
Article Type: Solution
Last Modified: 13 Oct 2025
Version:  4
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