17
Step Command
Remarks
5.
Enable unknown unicast
suppression and set the
unknown unicast suppression
threshold.
unicast-suppression
{
ratio
|
pps
max-pps
|
kbps
max-kbps
}
By default, unknown unicast
suppression is disabled.
Configuring storm control on an Ethernet interface
About storm control
Storm control compares broadcast, multicast, and unknown unicast traffic regularly with their respective
traffic thresholds on an Ethernet interface. For each type of traffic, storm control provides a lower
threshold and an upper threshold.
Depending on your configuration, when a particular type of traffic exceeds its upper threshold, the
interface performs either of the following tasks:
•
Blocks this type of traffic and forwards other types of traffic
—Even though the interface does not
forward the blocked traffic, it still counts the traffic. When the blocked traffic drops below the lower
threshold, the interface begins to forward the traffic.
•
Goes down automatically
—The interface goes down automatically and stops forwarding any
traffic. When the blocked traffic drops below the lower threshold, the interface does not
automatically come up. To bring up the interface, use the
undo shutdown
command or disable the
storm control function.
You can configure an Ethernet interface to output threshold event traps and log messages when
monitored traffic meets one of the following conditions:
•
Exceeds the upper threshold.
•
Drops below the lower threshold.
Any of the
storm-constrain
,
broadcast-suppression
,
multicast-suppression
, and
unicast-suppression
commands can suppress storm on an interface. The
broadcast-suppression
,
multicast-suppression
, and
unicast-suppression
commands suppress traffic in hardware. They have less impact on the device
performance than the
storm-constrain
command, which suppressions traffic in software.
Storm control uses a complete polling cycle to collect traffic data, and analyzes the data in the next cycle.
An interface takes one to two polling intervals to take a storm control action.
Configuration restrictions and guidelines
For the same type of traffic, do not configure storm control together with storm suppression. Otherwise,
the traffic suppression result is not determined. For more information about storm suppression, see
"
Configuration procedure
To configure storm control on an Ethernet interface:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
