Overview Of Port-Based Traffic Control - Cisco Catalyst 2960 series Configuration Manual

Overview of Port-Based Traffic Control

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Overview of Port-Based Traffic Control
Port-based traffic control is a set of Layer 2 features on the Cisco Catalyst switches used to filter or block
packets at the port level in response to specific traffic conditions. The following port-based traffic control
features are supported in the Cisco IOS Release for which this guide is written:
• Storm Control
• Protected Ports
• Port Blocking
• Port Security
• Protocol Storm Protection
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and
feature information, see Bug Search Tool and the release notes for your platform and software release. To
find information about the features documented in this module, and to see a list of the releases in which each
feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support.
To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not
required.
Information About Storm Control
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 an 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.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Finding Feature Information, page 1510
Information About Protocol Storm Protection, page 1510
How to Configure Protocol Storm Protection, page 1511
Monitoring Protocol Storm Protection, page 1512
Additional References, page 1513