Configuring Storm Control On An Ethernet Interface - HP 6125XLG Configuration Manual

Configuring storm control on an Ethernet interface

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 a higher threshold.
For management purposes, you can configure the interface to output threshold event traps and log
messages when monitored traffic exceeds the upper threshold or falls below the lower threshold from the
upper threshold.
Depending on your configuration, when a particular type of traffic exceeds its upper threshold, the
interface does either of the following:
Blocks this type of traffic, while forwarding other types of traffic—Even though the interface does
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not forward the blocked traffic, it still counts the traffic. When the blocked traffic drops below the
lower threshold, the port begins to forward the traffic.
Shuts down automatically—The interface shuts down automatically and stops forwarding any
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traffic. When the blocked traffic is detected dropping below the lower threshold, the port does not
forward the traffic. To bring up the interface, use the undo shutdown command or disable the storm
control function.
Any of the storm-constrain, broadcast-suppression, multicast-suppression, and unicast-suppression
commands can suppress storm on a port. The broadcast-suppression, multicast-suppression, and
unicast-suppression commands suppress traffic in hardware, and have less impact on device
performance than the storm-constrain command, which performs suppression 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 guidelines
For the same type of traffic, do not configure the storm constrain command together with any of the
broadcast-suppression, multicast-suppression, and unicast-suppression commands. Otherwise, the
traffic suppression result is not determined. For more information about the broadcast-suppression,
multicast-suppression, and unicast-suppression commands, see
Configuration procedure
To configure storm control on an Ethernet interface:
Step
1. Enter system view.
2. (Optional.) Set the traffic
polling interval of the storm
control module.
3. Enter Layer 2 Ethernet
interface view.
4. (Optional.) Enable storm
control, and set the lower and
upper thresholds for
broadcast, multicast, or
unknown unicast traffic.
Command
system-view
storm-constrain interval seconds
interface interface-type
interface-number
storm-constrain { broadcast |
multicast | unicast } { pps | kbps |
ratio } max-pps-values
min-pps-values
12
"Configuring storm suppression."
Remarks
N/A
The default setting is 10 seconds.
For network stability, use the
default or set a higher traffic
polling interval (10 seconds).
N/A
By default, storm control is
disabled.