Cisco Systems ME 3400 Configuring Port-Based Traffic Control

CHAPT ER

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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide

OL-9639-06

Configuring Port-Based Traffic Control

This chapter describes how to configure the port-based traffic control features on the Cisco ME 3400

Ethernet Access switch.

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

reference for this release.

This chapter consists of these sections:

• Configuring Storm Control, page 22-1

• Configuring Protected Ports, page 22-6

• Configuring Port Blocking, page 22-7

• Configuring Port Security, page 22-9

• Displaying Port-Based Traffic Control Settings, page 22-18

These sections contain this conceptual and configuration information:

• Understanding Storm Control, page 22-1

• Default Storm Control Configuration, page 22-3

• Configuring Storm Control and Threshold Levels, page 22-3

• Configuring Small-Frame Arrival Rate, page 22-5

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 or in the

network configuration 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.