Cisco Catalyst 3550 Series User Manual

CHAPTER
21-1
Catalyst 3550 Multilayer Switch Software Configuration Guide
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21
Configuring Port-Based Traffic Control
This chapter describes how to configure the port-based traffic control features on your Catalyst 3550
switch.
Note For complete syntax and usage information for the commands used in this chapter, refer to the command
reference for this release.
This chapter consists of these sections:
• Configuring Storm Control, page 21-1
• Configuring Protected Ports, page 21-5
• Configuring Port Blocking, page 21-6
• Configuring Port Security, page 21-8
• Displaying Port-Based Traffic Control Settings, page 21-16
Configuring Storm Control
These sections include storm control configuration information and procedures:
• Understanding Storm Control, page 21-1
• Default Storm Control Configuration, page 21-3
• Enabling Storm Control, page 21-3
• Disabling Storm Control, page 21-4
Understanding Storm Control
Storm control prevents switchports 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.

Cisco Catalyst 3550 Series Specifications

General

Form Factor	Rack-mountable
Manageable	Yes
RAM	64 MB
Device Type	Switch
MAC Address Table Size	12000 entries
Routing Protocol	RIP
Features	VLAN support
Power Supply	AC 120/230 V (50/60 Hz)
Ports	24 or 48 x 10/100Base-TX, 1 x GBIC, 2 x 10/100/1000Base-T
Operating Temperature	32 to 113°F (0 to 45°C)