How do I verify and change the speed of NIC on Linux?

Verify the speed of NIC on Linux?

"ethtool eth0 | grep Speed"

1. Turn off the automatic auto-negotiation setting of the network interface

ethtool -s eth0 autoneg off
ethtool -s eth1 autoneg off

2. Respecify the connection speed of the network interface as 1000Mb/s with Full Duplex, with the syntax as follows

ethtool -s eth0 speed 1000 duplex full
ethtool -s eth1 speed 1000 duplex full

 If you don't have the ethtool package on your computer, do "apt-get install ethtool" first

TS-482(SW) : 

en

config

interface range gi0/1-48

speed 1000