Enabling Loopback Test - H3C S3100 Series Operation Manual

Operation
Enable loopback detection
on a specified port
Enable loopback port
control on the trunk or
hybrid port
Enable the loopback port
auto-shutdown function
Configure the system to run
loopback detection on all
VLANs of the current trunk
or hybrid port
To enable loopback detection on a specific port, you must use the loopback-detection enable
command in both system view and the specific port view.
After you use the undo loopback-detection enable command in system view, loopback detection
will be disabled on all ports.

Enabling Loopback Test

You can configure the Ethernet port to run loopback test to check if it operates normally. The port
running loopback test cannot forward data packets normally. The loopback test terminates
automatically after a specific period.
Table 1-6 Enable loopback test
Operation
Enter system view
Enter Ethernet port view
Enable loopback test
Command
loopback-detection enable
loopback-detection control
enable
loopback-detection shutdown
enable
loopback-detection per-vlan
enable
system-view
interface interface-type interface-number
loopback { external | internal }
1-6
Optional
By default, the loopback detection function
is enabled on ports if the device boots with
the default configuration file (config.def); if
the device boots with null configuration, this
function is disabled.
Optional
By default, the loopback port control
function is enabled on ports if the device
boots with the default configuration file
(config.def); if the device boots with null
configuration, this function is disabled.
Optional
By default, the loopback port
auto-shutdown function is enabled on ports
if the device boots with the default
configuration file (config.def); if the device
boots with null configuration, this function is
disabled.
Optional
By default, the system runs loopback
detection only on the default VLAN of the
current trunk or hybrid port.
Command
Remarks
Remarks
—
—
Optional