Cisco Catalyst 2960 Series, Configuration Manual

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Technical Assistance
Link Description
http://www.cisco.com/support
The Cisco Support website provides extensive online
resources, including documentation and tools for
troubleshooting and resolving technical issues with
Cisco products and technologies.
To receive security and technical information about
your products, you can subscribe to various services,
such as the Product Alert Tool (accessed from Field
Notices), the Cisco Technical Services Newsletter,
and Really Simple Syndication (RSS) Feeds.
Access to most tools on the Cisco Support website
requires a Cisco.com user ID and password.
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 Protocol Storm Protection
Protocol Storm Protection
When a switch is flooded with Address Resolution Protocol (ARP) or control packets, high CPU utilization
can cause the CPU to overload. These issues can occur:
• Routing protocol can flap because the protocol control packets are not received, and neighboring
adjacencies are dropped.
• Spanning Tree Protocol (STP) reconverges because the STP bridge protocol data unit (BPDU) cannot
be sent or received.
• CLI is slow or unresponsive.
Using protocol storm protection, you can control the rate at which control packets are sent to the switch by
specifying the upper threshold for the packet flow rate. The supported protocols are ARP, ARP snooping,
Dynamic Host Configuration Protocol (DHCP) v4, DHCP snooping, Internet Group Management Protocol
(IGMP), and IGMP snooping.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Finding Feature Information