Auto-negotiation is a feature of the IEEE 802.3u Fast Ethernet protocol. It targets the device ports to provide an optimal performance of speed, duplex mode, and flow control for information exchange over a link. Using the auto-negotiation protocol, you have optimal performance of data transfer over the Ethernet.
To utilize maximum performance of auto-negotiation, use the same configuration on both sides of a link.
34.2. Configuring 802.3 link settings using the nmcli utility
To configure the 802.3 link settings of an Ethernet connection, modify the following configuration parameters:
Display the current settings of the connection:
# nmcli connection show Example-connection
You can use these values if you need to reset the parameters in case of any problems.