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Chapter 47. Configuring 802.3 link settings
By using the auto-negotiation protocol, you have optimal performance of data transfer over the Ethernet.
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.
To utilize maximum performance of auto-negotiation, use the same configuration on both sides of a link.
47.1. 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:
-
802-3-ethernet.auto-negotiate -
802-3-ethernet.speed -
802-3-ethernet.duplex
Procedure
Display the current settings of the connection:
Copy to Clipboard Copied! Toggle word wrap Toggle overflow You can use these values if you need to reset the parameters in case of any problems.
Set the speed and duplex link settings:
nmcli connection modify Example-connection 802-3-ethernet.auto-negotiate yes 802-3-ethernet.speed 10000 802-3-ethernet.duplex full
# nmcli connection modify Example-connection 802-3-ethernet.auto-negotiate yes 802-3-ethernet.speed 10000 802-3-ethernet.duplex fullCopy to Clipboard Copied! Toggle word wrap Toggle overflow This command enables auto-negotiation and sets the speed of the connection to
10000Mbit full duplex.Reactivate the connection:
nmcli connection up Example-connection
# nmcli connection up Example-connectionCopy to Clipboard Copied! Toggle word wrap Toggle overflow
Verification
Use the
ethtoolutility to verify the values of Ethernet interfaceenp1s0:Copy to Clipboard Copied! Toggle word wrap Toggle overflow
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