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CHAPTER
18-1
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
18
Configuring Port-Based Traffic Control
This chapter describes how to configure the port-based traffic control features on your 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 18-3
• Configuring Port Security, page 18-4
• Displaying Port-Based Traffic Control Settings, page 18-12
Configuring Storm Control
These sections include storm control configuration information and procedures:
• Understanding Storm Control, page 18-1
• Default Storm Control Configuration, page 18-2
• Enabling Storm Control, page 18-2
• Disabling Storm Control, page 18-3
Understanding Storm Control
A packet storm occurs when a large number of broadcast, unicast, or multicast packets are received on
a port. Forwarding these packets can cause the network to slow down or to time out. Storm control is
configured for the switch as a whole but operates on a per-port basis. By default, storm control is
disabled.
Storm control uses rising and falling thresholds to block and then restore the forwarding of broadcast,
unicast, or multicast packets. You can also set the switch to shut down the port when the rising threshold
is reached.
Storm control uses a bandwidth-based method to measure traffic activity. The thresholds are expressed
as a percentage of the total available bandwidth that can be used by the broadcast, multicast, or unicast
traffic.