How to check the rate of an interface of an AR router

You can run the display interface ethernet brief command on an AR router to check the brief information about the Ethernet interface of the router, including the physical state, auto-negotiation method, duplex mode, rate, and average bandwidth utilization rate in the receiving and sending directions in the recent period of the interface.
In the output information displayed after the command is run, the Bandwidth column describes the bandwidth of the interface. In auto-negotiation mode, you can run the auto speed { 10 | 100 | 1000 }* command to configure the rate of the Ethernet interface. You can run the undo negotiation auto command to configure the Ethernet interface to be working in non-auto negotiation mode and run the speed { 10 | 100 | 1000 | 10000 } command to configure the rate of the Ethernet interface in the non-auto negotiation mode.

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