Configuring Traffic Storm Control; Understanding Traffic Storm Control - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

Configuring Traffic Storm Control

This chapter describes how to configure the traffic storm control feature on the Catalyst 6500 series
switches.
For complete syntax and usage information for the commands used in this chapter, refer to the
Note
Catalyst Supervisor Engine 32 PISA Cisco IOS Command Reference, Release 12.2ZY at this URL:
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2ZY/command/reference/cmdref.h
tml
This chapter consists of these sections:
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Understanding Traffic Storm Control

A traffic storm occurs when packets flood the LAN, creating excessive traffic and degrading network
performance. The traffic storm control feature prevents LAN ports from being disrupted by a broadcast,
multicast, or unicast traffic storm on physical interfaces.
Traffic storm control (also called traffic suppression) monitors incoming traffic levels over a 1-second
traffic storm control interval and, during the interval, compares the traffic level with the traffic storm
control level that you configure. The traffic storm control level is a percentage of the total available
bandwidth of the port. Each port has a single traffic storm control level that is used for all types of traffic
(broadcast, multicast, and unicast).
Traffic storm control monitors the level of each traffic type for which you enable traffic storm control in
1-second traffic storm control intervals. Within an interval, when the ingress traffic for which traffic
storm control is enabled reaches the traffic storm control level that is configured on the port, traffic storm
control drops the traffic until the traffic storm control interval ends.
Figure 36-1
example, traffic storm control occurs between times T1 and T2 and between T4 and T5. During those
intervals, the amount of broadcast traffic exceeded the configured threshold.
OL-11439-03
Understanding Traffic Storm Control, page 36-1
Default Traffic Storm Control Configuration, page 36-2
Configuration Guidelines and Restrictions, page 36-3
Enabling Traffic Storm Control, page 36-3
shows the broadcast traffic patterns on a LAN interface over a given interval. In this
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
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C H A P T E R
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