Figure 61 Loopback test result
When you configure a loopback test, follow these guidelines:
You can perform an internal loopback test but not an external loopback test on a port that is
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physically down. You can perform neither test on a port that is manually shut down.
The system does not allow Rate, Duplex, Cable Type, and Port Status configuration on a port under
•
a loopback test.
An Ethernet port operates in full duplex mode when the loopback test is performed. It restores its
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original duplex mode after the loopback test.
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