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CHAPTER
28-1
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
28
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
stand
alone switch and to a Catalyst 3750-X switch stack.
Note For complete syntax and usage information for the commands used in this chapter, see the command
reference for this release.
• Configuring Storm Control, page 28-1
• Configuring Protected Ports, page 28-6
• Configuring Port Blocking, page 28-7
• Configuring Port Security, page 28-8
• Displaying Port-Based Traffic Control Settings, page 28-19
Configuring Storm Control
• Understanding Storm Control, page 28-1
• Default Storm Control Configuration, page 28-3
• Configuring Storm Control and Threshold Levels, page 28-3
• Default Protected Port Configuration, page 28-6
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.
Storm control (or traffic suppression) monitors packets passing from a
n 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.