H3C Technologies H3C S3100 Series Switches - Manual (Page 131)

Operation Manual – Port Basic Configuration
H3C S3100-52P Ethernet Switch Chapter 1 Port Basic Configuration
1-9
Operation Command Remarks
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.
Display port loopback
detection information
display
loopback-detection
Optional
You can use the command in
any view.
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.
1.2.9 Configuring the Ethernet Port to Run 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 1-11
Configure the Ethernet port to run loopback test
Operation Command Remarks
Enter system view
system-view
—
Enter Ethernet port view
interface interface-type
interface-number
—
Configure the Ethernet port to
run loopback test
loopback
{ external | internal } Optional