How to disable Smart AN on CX6 adapter

I want to disable Smart AN on Mellanox CX6 adapter
how to do that ?


To set a forced speed and disable auto-negotiation, you will need to utilize the mlxlink utility included with our MFT package.

For more example, to set a 25G link with AN disabled:

mst start

mst status -v (take note of the MST device name)

mlxlink -d -p <port_number> --speeds 25G --link_mode_forced

For more information on mlxlink, please see the latest MFT documentation:

If MFT was not installed as part of your MLNX_OFED driver installation, it can be downloaded separately here:

Thank you,
-Nvidia Network Support

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