Installation guide

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
How to Configure EtherSwitch HWICs
46
Cisco IOS Release 12.3(8)T4
OL-6454-01
Configuring Per-Port Storm-Control
You can use these techniques to block the forwarding of unnecessary flooded traffic. This section
describes how to configure per-port storm-control and characteristics on your router and consists of the
following configuration procedures:
• Enabling Per-Port Storm-Control, page 46
• Disabling Per-Port Storm-Control, page 47
By default, unicast, broadcast, and multicast suppression is disabled.
Enabling Per-Port Storm-Control
Beginning in privileged EXEC mode, follow these steps to enable per-port storm-control.
SUMMARY STEPS
1. configure terminal
2. interface interface-id
3. storm-control {broadcast | multicast | unicast} level level-high [ level-low ]
4. storm-control action shutdown
5. end
6. show storm-control [interface] [{broadcast | multicast | unicast | history}]
DETAILED STEPS
Note If any type of traffic exceeds the upper threshold limit, all of the other types of traffic will be stopped.
Command Purpose
Step 1
configure terminal
Enters global configuration mode.
Step 2
interface interface-id
Enters interface configuration mode, and enter the port to configure.
Step 3
storm-control {broadcast | multicast |
unicast} level level-high [ level-low ]
Configures broadcast, multicast, or unicast per-port storm-control.
Specify the rising threshold level for either broadcast, multicast, or
unicast traffic. The storm control action occurs when traffic
utilization reaches this level.
(Optional) Specify the falling threshold level. The normal
transmission restarts (if the action is filtering) when traffic drops
below this level.
Step 4
storm-control action shutdown
Selects the shutdown keyword to disable the port during a storm.
The default is to filter out the traffic.
Step 5
end
Returns to privileged EXEC mode.
Step 6
show storm-control [interface]
[{broadcast | multicast | unicast |
history}]
Verifies your entries.