3com S7906E Guide De Référence

 

1-19 

[Sysname] interface ethernet 2/0/1 

[Sysname-Ethernet2/0/1] link-delay 8 

loopback { external | internal } 

undo loopback 

Ethernet interface view 

2: System level 

external: Enables external loopback testing on an Ethernet interface. 

internal: Enables internal loopback testing on an Ethernet interface. 

Use the loopback command to enable Ethernet interface loopback testing. 

Use the undo loopback command to disable Ethernet interface loopback testing. 

By default, Ethernet interface loopback testing is disabled. 

 

z 

Ethernet interface loopback testing should be enabled while testing certain functionalities, such as 

during the initial identification of any network failure. 

z 

While enabled, Ethernet interface loopback testing will work in full-duplex mode. The interface will 

return to its original state upon completion of the loopback testing. 

 

# Enable loopback testing on Ethernet 2/0/1. 

<Sysname> system-view 

[Sysname] interface ethernet 2/0/1 

[Sysname-Ethernet2/0/1] loopback internal 

loopback-detection control enable 

undo loopback-detection control enable