H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 141)

19-3
Figure 19-2 Loopback test result
Configuration Guidelines
Note the following when performing a loopback test:
You can perform an internal loopback test but not an external loopback test for a port that is
physically down, while you can perform neither test for a port that is manually shut down.
The system does not allow Rate, Duplex, and Port Status configuration on a port under the
loopback test.
An Ethernet port works in the full duplex mode when the loopback test is performed, and restores
its original duplex mode after the loopback test.