CHAPTER
23-1
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
OL-26520-01
23
Configuring Port-Based Traffic Control
This chapter describes how to configure the port-based traffic control features on the Catalyst 2960,
2960-S, or 2960-C switch. Unless otherwise noted, the term switch refers to a standalone switch and a
switch stack.
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 23-1
• Configuring Protected Ports, page 23-6
• Configuring Port Blocking, page 23-7
• Configuring Port Security, page 23-8
• Configuring Protocol Storm Protection, page 23-18
• Displaying Port-Based Traffic Control Settings, page 23-19
Configuring Storm Control
• Understanding Storm Control, page 23-1
• Default Storm Control Configuration, page 23-3
• Configuring Storm Control and Threshold Levels, page 23-3
• Configuring Small-Frame Arrival Rate, page 23-5
Understanding 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.
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