Configuring Storm Control; Understanding Storm Control - Cisco Catalyst 3560-X Software Configuration Manual

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Table of Contents

Configuring Port-Based Traffic Control

This chapter describes how to configure the port-based traffic control features on the Catalyst 3750-X

or 3560-X switch. Unless otherwise noted, the term switch refers to a Catalyst 3750-X or 3560-X

standalone switch and to a Catalyst 3750-X switch stack.

For complete syntax and usage information for the commands used in this chapter, see the command

reference for this release.

Configuring Storm Control

Storm control prevents traffic on a LAN from being disrupted by a broadcast, multicast, or unicast storm

on one of the physical interfaces. A LAN storm occurs when packets flood the LAN, creating excessive

traffic and degrading network performance. Errors in the protocol-stack implementation, mistakes in

network configurations, or users issuing a denial-of-service attack can cause a storm.

Storm control (or traffic suppression) monitors packets passing from an interface to the switching bus

and determines if the packet is unicast, multicast, or broadcast. The switch counts the number of packets

of a specified type received within the 1-second time interval and compares the measurement with a

predefined suppression-level threshold.

Configuring Storm Control, page 1-1

Configuring Protected Ports, page 1-6

Configuring Port Blocking, page 1-7

Configuring Port Security, page 1-8

Configuring Protocol Storm Protection, page 1-19

Displaying Port-Based Traffic Control Settings, page 1-21

Understanding Storm Control, page 1-1

Default Storm Control Configuration, page 1-3

Configuring Storm Control and Threshold Levels, page 1-3

Default Protected Port Configuration, page 1-6

C H A P T E R

Catalyst 3750-X and 3560-X Switch Software Configuration Guide

Catalyst 3750-x