H3C Technologies H3C S7500E Series Switches - Manual (Page 23)

1-9
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet port or ONU port
view
interface interface-type
interface-number
—
Perform loopback testing loopback { external | internal } Required
On an interface that is physically down, you can perform only 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 port works in full duplex mode. When you disable loopback
testing, the original duplex setting of the port restores.
Loopback testing is a one-time operation, and is not recorded in the configuration file.
Configuring a Port Group
The switch allows you to configure some functions on multiple ports at a time by assigning the ports to
a port group in addition to configuring them on a per-port basis. This is helpful when you have to
configure a feature in the same way on multiple ports.
A port group is created manually and the settings you made on it apply to all group member ports. Note
that even though the settings are made on the port group, they are saved on a port basis rather than
on a port group basis. Thus, you can only view the settings in the view of each port with the display
current-configuration command or the display this command.
Follow these steps to configure a manual port group:
To do… Use the command… Remarks
Enter system view system-view —
Create a manual port group and
enter manual port group view
port-group manual
port-group-name
Required
Add Ethernet ports to the manual
port group
group-member interface-list Required