3com 4500 50-PORT 사용자 설명서

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Use the 

loopback-detection enable

 command to enable port loopback 

detection. If there is a loopback port found, the switch will put it under control. 
Use the 

 command to disable port loopback 

detection.

Loopback detection of a specified port only functions after port loopback 
detection is enabled in the System or Ethernet port view. By default, port loopback 
detection is disabled.

Related commands: 

To enable port loopback detection, enter the following:

<4500>system-view

System View: return to User View with Ctrl+Z.

[4500]loopback-detection enable

[4500]interface ethernet 1/0/1

[4500-Ethernet1/0/1]loopback-detection enable

[4500-Ethernet1/0/1]

System View

Specifies the interval of monitoring external loopback conditions of the 

port. It ranges from 5 to 300, measured in seconds.

By default, the interval is 30 seconds.

Use the 

 command to configure the 

detection interval for the external loopback condition of each port. Use the 

 command to restore the default interval.

Related commands: 

To configure the detection interval for the external loopback condition of each 
port to 10 seconds, enter the following:

<4500>system-view

System View: return to User View with Ctrl+Z.

[4500]loopback-detection interval-time 10