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DCS-3950 series Ethernet switch manual
22.4.2 Port Loopback Dection Troubleshooting
The function of port loopback detection is disabled by default and should only be
enabled if required, or it might affect the performance of the system because that the
loopback detection messages are broadcast messages.
With normal configuration, after enabling the function of port loopback detection, the
‘debug loopback detection’ command can be used to check the detailed information of
loopback detection and the validity of the detection result, if there is an obvious loopback
in the connected network.
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