How to Configure the Loopback Function on Huawei S2700?

Questions:
How to configure MA5621 the Loopback Function on Huawei Quidway S2700?

Answer:

Run:system-view,The system view is displayed.
Run:interface interface-type interface-number,The interface view is displayed.
Run:loopback internal,The loopback function is configured on the Ethernet interface.By default, the loopback function is disabled on an Ethernet interface.

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