3com 5500-ei pwr Guía De Referencia

 

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<Sysname> system-view 

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

[Sysname] interface ethernet 1/0/1 

[Sysname-Ethernet1/0/1] loopback internal 

 Loopback internal succeeded. 

Ethernet port view 

None 

Use the loopback-detection control enable command to enable the loopback detection control 

feature on the current trunk or hybrid port.  

Use the undo loopback-detection control enable command to disable the loopback detection control 

feature on the trunk or hybrid port. 

This function needs to be used in conjunction with the loopback detection function. For details, refer to 

the loopback-detection enable command. When a loopback is detected in a VLAN on a trunk or 

hybrid port, you can use this function to control the working status of the port. 

z 

If this feature is enabled on the trunk or hybrid port, when loopback is found on the port, the system 

sets the port to the block state (where the port cannot forward data packets), sends log messages 

to the terminal, and removes the corresponding MAC forwarding entry. After the loop is removed, 

the port automatically resumes the normal forwarding state. 

z 

If this feature is disabled on the trunk or hybrid port, when loopback is found on the port, the system 

merely reports a Trap message, and the port still works normally.  

By default, the loopback detection control feature is disabled on the trunk or hybrid port. 

Note that, this command is not applicable to access ports. When the link type of a non-access port 

changes to access, the loopback-detection control enable command already configured on the port 

becomes invalid automatically.  

Related commands: loopback-detection enable.  

# Enable the loopback detection control feature on Ethernet 1/0/1.  

<Sysname> system-view 

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

[Sysname] interface ethernet 1/0/1 

[Sysname-Ethernet1/0/1] port link-type trunk 

[Sysname-Ethernet1/0/1] loopback-detection control enable