CHAPTER
18-1
Catalyst 3750 MetroSwitch Software Configuration Guide
78-15870-01
18
Configuring Port-Based Traffic Control
This chapter describes how to configure port-based traffic control features on the Catalyst 3750 Metro
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 18-1
• Configuring Protected Ports, page 18-4
• Configuring Port Blocking, page 18-5
• Configuring Port Security, page 18-6
• Displaying Port-Based Traffic Control Settings, page 18-14
Configuring Storm Control
These sections include storm control configuration information and procedures:
• Understanding Storm Control, page 18-1
• Default Storm Control Configuration, page 18-3
• Enabling Storm Control, page 18-3
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.
Storm control (or traffic suppression) monitors incoming traffic statistics over a time period and
compares the measurement with a predefined suppression level threshold. The threshold represents the
percentage of the total available bandwidth of the port. The switch supports separate storm control
thresholds for broadcast, multicast, and unicast traffic. If the threshold of a traffic type is reached, further
traffic of that type is suppressed until the incoming traffic falls below the threshold level.
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