Operation Manual – Port Basic Configuration
H3C S3100 Series Ethernet Switches Chapter 1 Port Basic Configuration
1-6
Operation Command Remarks
Enable loopback
detection on a
specified port
loopback-detection
enable
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.
Enable loopback
port control on the
trunk or hybrid port
loopback-detection
control enable
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.
Enable the loopback
port auto-shutdown
function
loopback-detection
shutdown enable
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.
Configure the
system to run
loopback detection
on all VLANs of the
current trunk or
hybrid port
loopback-detection
per-vlan enable
Optional
By default, the system runs
loopback detection only on the
default VLAN of the current trunk
or hybrid port.
Caution:
z 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.
z After you use the undo loopback-detection enable command in system view,
loopback detection will be disabled on all ports.
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