Chapter 88 Example: Rate Limiting Configuration; Switches - Juniper JUNOS OS 10.3 - SOFTWARE Manual

CHAPTER 88
Example: Rate Limiting Configuration
Example: Configuring Storm Control to Prevent Network Outages on EX Series Switches
Requirements
Overview and Topology
Copyright © 2010, Juniper Networks, Inc.
Example: Configuring Storm Control to Prevent Network Outages on EX Series
Switches on page 2793
Storm control enables you to prevent network outages caused by broadcast storms on
the LAN. You can configure storm control on the EX Series switch to rate limit broadcast
traffic and unknown unicast traffic at a specified level and to drop packets when the
specified traffic level is exceeded, thus preventing packets from proliferating and
degrading the LAN.
This example shows how to configure storm control on a single EX Series switch:
Requirements on page 2793
Overview and Topology on page 2793
Configuration on page 2794
This example uses the following hardware and software components:
One EX Series switch
Junos OS Release 9.5 or later for EX Series switches
A storm is generated when messages are broadcast on a network and each message
prompts a receiving node to respond by broadcasting its own messages on the network.
This, in turn, prompts further responses, creating a snowball effect and resulting in a
broadcast storm that can cause network outages.
You can use storm control to prevent broadcast storms by specifying the amount, also
known as the storm control level, of broadcast traffic and unknown unicast traffic to be
allowed on an interface. You specify the storm control level as the traffic rate in kilobits
per second of the combined broadcast and unknown unicast streams.
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