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Cisco Catalyst 2960-XR User Manual

Cisco Catalyst 2960-XR
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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 feature
information and caveats, see the release notes for your platform and software release.
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.
How Traffic Activity is Measured
Storm control uses one of these methods to measure traffic activity:
Bandwidth as a percentage of the total available bandwidth of the port that can be used by the broadcast,
multicast, or unicast traffic
Traffic rate in packets per second at which broadcast, multicast, or unicast packets are received
Traffic rate in bits per second at which broadcast, multicast, or unicast packets are received
Catalyst 2960-XR Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX1
326 OL-29434-01
Configuring Port-Based Traffic Control
Overview of Port-Based Traffic Control

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Cisco Catalyst 2960-XR Specifications

General IconGeneral
Stacking Bandwidth80 Gbps
Layer SupportLayer 2 and Layer 3
Jumbo Frame Support9198 bytes
RAM512 MB
Input Voltage100-240V AC
ModelCatalyst 2960-XR
Uplink Interfaces4 x 1G SFP or 2 x 10G SFP+
Downlink Interfaces24 or 48 x Gigabit Ethernet ports
Power SupplyInternal
MAC Address Table Size16, 000 entries
PoEAvailable on PoE models
Weight4.5 kg
Featuresenergy efficiency
StackingUp to 8 switches
Operating Temperature0 to 45°C

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