3Com 5500-EI Series, Справочное руководство

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By default, the global loopback detection function is enabled if the device boots with the default
configuration file (config.def);
By default, this function is disabled. if the device boots with null configuration,
Related command: loopback-detection control enable , loopback-detection shutdown enable
Examples
# Enable the loopback detection feature on Ethernet 1/0/1.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] loopback-detection enable
[Sysname] interface ethernet 1/0/1
[Sysname-Ethernet1/0/1] loopback-detection enable
loopback-detection interface-list enable
Syntax
loopback-detection interface-list enable
undo loopback-detection interface-list enable
View
System view
Parameter
interface-list : Ethernet port list, in the form of interface-list = { interface-type interface-number [ to
interface-type interface-number ] } &<1-10>, where
z
interface-type is the port type, and interface-number is the port number.
z
Keyword to is used to specify a range of ports. The port number after to must be equal to or greater
than that before to .
z
&<1-10> means that you can specify up to 10 ports or port ranges.
Description
Use the loopback-detection interface-list enable command to enable the loopback detection function
on a range of ports.
Use the undo loopback-detection interface-list enable command to disable the loopback detection
function on a range of ports.
z
By default, the loopback detection function is enabled on ports if the device boots with the default
configuration file (config.def);
z
if the device boots with null configuration, this function is disabled.
Example
# Enable the loopback detection function on ports Ethernet 1/0/1 through Ethernet 1/0/4.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] loopback-detection enable
[Sysname] loopback-detection Ethernet 1/0/1 to Ethernet 1/0/4 enable