Perform the steps given below to provide a loopback on Ethernet port.
Click Maintenance > Loop-Backs > Ethernet in the navigation pane. The Ethernet port loopback preview pane is displayed.
Click the desired ETH port link on which you want to perform the loopback. The Port maintenance ETH-1-<slot number>-<port number> preview pane is displayed.
Click on LoopBack Mode drop down and select the desired loopback operation.
Click Submit. A confirmation message is displayed.
Click Accept Valid Modifications. A "Successfully Modified" message is displayed under the Warnings field.
A click on Back link will direct you to the Port maintenance preview pane of the same interface.
