1-5
To do…
Use the command…
Remarks
Enable loopback testing
loopback
{
external
|
internal
}
Optional
Disabled by default.
z
As for the internal loopback test and external loopback test, if a port is down (port state shown as
DOWN), only the former is available on it; if the port is shut down (port state shown as ADM or
Administratively DOWN), both are unavailable.
z
The
speed
,
duplex
,
mdi
, and
shutdown
commands are not applicable during loopback testing.
z
With the loopback testing enabled, the Ethernet port operates in full duplex mode. With the
loopback testing disabled, the original configurations will be restored.
Configuring a Port Group
The devices allow 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
Configuring Storm Suppression
You can use the following commands to suppress the broadcast, multicast, and unknown unicast traffic.
In port configuration mode, the suppression ratio indicates the maximum broadcast, multicast or
unknown unicast traffic that is allowed to pass through a port. When the broadcast, multicast, or
unknown unicast traffic over the port exceeds the threshold, the system will discard the extra packets so
that the broadcast, multicast or unknown unicast traffic ratio can drop below the limit to ensure that the
network functions properly.
