Created on Jun 4, 2019

Updated on Sep 13, 2021


This How To describes how to manage the port type (InfiniBand or Ethernet) of NVIDIA ConnectX® InfiniBand/VPI Cards in VMware ESXi 6.x and above.


Hardware and Software Requirements

1. A server platform with an adapter card based on one of the following NVIDIA Technologies’ HCA devices:

2. Installer Privileges: The installation requires administrator privileges on the target machine.

3. Device ID: For the latest list of device IDs, please visit NVIDIA NETWORKING website.

Port Type Management

NVIDIA ConnectX adapter card may be equipped with one or two ports can be individually configured to work as InfiniBand or Ethernet ports.

The port type depends on the card type. In case of a VPI card, the default type is IB. If you wish to change the port type use the mlxconfig script, is included in NVIDIA Firmware Tools(MFT).

For further information on how to install MFT please use following link - How-to: Install NVIDIA Firmware Tools (MFT) on VMware ESXi 6.7/7.0.

The protocol types are:

  • Port Type 1 = IB
  • Port Type 2 = Ethernet

To print the current status of Mellanox devices:

1. Enable SSH Access to ESXi server.

2. Log into ESXi vSphere Command-Line Interface with root permissions.

3. Run the following command:

/opt/mellanox/bin/mst status
MST devices:



To use a VPI card as an Ethernet only type card:

1. Enter Maintenance Mode the ESXi host.

2. And run:

~ /opt/mellanox/bin/mlxconfig -d /dev/mt4125_pciconf7 set LINK_TYPE_P1=2 LINK_TYPE_P2=2

3. Restart a server.

~ reboot

4. Exit from Maintenance Mode the ESXi host.

For more information on how to set the port type in ConnectX®-5/ConnectX®-6, please refer to the MFT User Manual ( NVIDIA Firmware Tools (MFT) Product Page).


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