18
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 operations:
•
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 feature.
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.
Both storm suppression and storm control can suppress storms on an interface. Storm suppression
uses the chip to suppress traffic. Storm suppression has less impact on the device performance than
storm control, which uses software to suppress traffic.
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 traffic suppression result to be determined, do not configure storm control together with storm
suppression for the same type of traffic. 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
2.
(Optional.) Set the statistics
polling interval of the storm
control module.
storm-constrain interval interval
The default setting is 10 seconds.
For network stability, use the
default or set a longer statistics
polling interval.
3.
Enter Ethernet interface
view.
interface interface-type
interface-number
N/A
