CHAPTER
28-1
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
78-14064-04
28
Configuring Traffic Storm Control
This chapter describes how to configure the traffic storm control feature on the Cisco 7600 series routers.
Release 12.1(12c)E1 and later releases support traffic storm control. For earlier releases, refer to
Chapter 29, “Configuring Broadcast Suppression.”
Note • For complete syntax and usage information for the commands used in this chapter, refer to the
Cisco 7600 Series Router Cisco IOS Command Reference publication.
• The WS-X6548-GE-TX, WS-X6548V-GE-TX, WS-X6148-GE-TX, and WS-X6148V-GE-TX
switching modules do not support traffic storm control.
This chapter consists of these sections:
• Understanding Traffic Storm Control, page 28-1
• Default Traffic Storm Control Configuration, page 28-2
• Enabling Traffic Storm Control, page 28-2
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).
Note • The router supports multicast and unicast traffic storm control only on Gigabit Ethernet LAN ports.
• The router supports broadcast traffic storm control on all LAN ports.
• Traffic storm control does not suppress spanning tree packets. Except for spanning tree packets,
traffic storm control does not differentiate between control traffic and data traffic.
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