Appendix C Switch Port Functionality

Storm Control

when a threshold for one type of traffic is reached, that type of traffic is dropped. This threshold is specified as a percentage of the total available bandwidth that can be used by broadcast (multicast or unicast) traffic.

The combination of broadcast suppression threshold numbers and the 1-second time interval control the way the suppression algorithm works. A higher threshold allows more packets to pass through. A threshold value of 100 percent means that no limit is placed on the traffic.

Note Because packets do not arrive at uniform intervals, the 1-second time interval during which traffic activity is measured can affect the behavior of storm control.

The switch continues to monitor traffic on the port. When the utilization level falls back below the threshold level, the type of traffic that was dropped is forwarded again.

Use the storm-control broadcast, storm-control multicast, and storm-control unicast global configuration commands to set up the storm control threshold value.

Storm Control Configuration

This section describes how to configure storm control on your router. It consists of the following configuration information and procedures:

Enabling Storm Control

Verifying Storm Control

By default, unicast, broadcast, and multicast suppression is disabled on the switch.

Enabling Storm Control

Enable storm-controlglobally and enter the percentage of total available bandwidth that you want to be used by a all traffic (multicast, unitcast,); entering 100 percent would allow all traffic.

To enable a particular type of storm-control, use the following commands beginning in privileged EXEC mode:

 

 

 

Command

Purpose

 

 

 

 

 

 

Step 1

Router# configure terminal

Enters global configuration mode.

 

 

 

 

 

 

Step 2

Router(config)# [no] storm-control

Specifies the broadcast suppression level for an interface as a

 

 

 

broadcast threshold <0-100>

percentage of total bandwidth. A threshold value of 100 percent

 

 

 

 

 

means that no limit is placed on broadcast traffic.

 

 

 

 

 

Use the no keyword to restore the defaults.

 

 

 

 

 

 

Step 3

Router(config)# [no] storm-control

Specifies the multicast suppression level for an interface as a

 

 

 

multicast threshold <0-100>

percentage of total bandwidth.

 

 

 

 

 

Use the no keyword to restore the defaults.

 

 

 

 

 

 

Step 4

Router(config)# [no] storm-control

Specifies the unicast suppression level for an interface as a

 

 

 

unicast threshold <0-100>

percentage of total bandwidth.

 

 

 

 

 

Use the no keyword to restore the defaults.

 

 

 

 

 

 

Step 5

Router(config)# end

Returns to privileged EXEC mode.

 

 

 

 

 

 

 

 

 

 

 

Cisco 3200 Series Router Hardware Reference

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C-14

 

 

OL-5816-10

 

 

 

 

 

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Cisco Systems 3200 manual Storm Control Configuration, Enabling Storm Control

3200 specifications

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