H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 13)

4
To do… Use the command… Remarks
Enter Ethernet interface view
interface interface-type
interface-number
—
Set a physical state change
suppression interval
link-delay delay-time
Required
By default, physical state change suppression
is disabled.
Configuring loopback testing on an Ethernet interface
If an Ethernet interface does not work normally, you can enable loopback testing on it to identify the
problem. Loopback testing has the following types:
• Internal loopback testing—Tests all on-chip functions related to Ethernet interfaces.
• External loopback testing—Tests hardware of Ethernet interfaces. To perform external loopback
testing on an Ethernet interface, connect a loopback plug to the Ethernet interface. The device sends
test packets out the interface, which are expected to loop over the plug and back to the interface.
If the interface fails to receive any test packet, the hardware of the interface is faulty.
An Ethernet interface in a loopback test does not forward data traffic.
Follow these steps to enable loopback testing on an Ethernet interface:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet interface view
interface interface-type
interface-number
—
Enable loopback testing loopback { external | internal }
Optional
Disabled by default.
NOTE:
•
On an interface that is physically down, you can only perform internal loopback testing. On an interface
administratively shut down, you can perform neither internal nor external loopback testing.
• The speed, duplex, mdi, and shutdown commands are unavailable during loopback testing.
• During loopback testing, an Ethernet interface works in full duplex mode. When you disable loopback
testing, the duplex configuration of the interface restores.
• The loopback configuration is executed for only once, and is not saved in the configuration file.
Configuring a port group
Some interfaces on your device may use the same set of settings. To configure these interfaces in bulk
rather than one by one, you can assign them to a port group.
You create port groups manually. All settings made for a port group apply to all the member ports of the
group. For example, you can configure a traffic suppression threshold (see “ Configuring storm
suppression “) for multiple interfaces in bulk by assigning these interfaces to a port group.