Storm Control - Cisco 350XG series Administration Manual

Security

Storm Control

Storm Control
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Cisco 350XG & 550XG Series 10G Stackable Managed Switches
• Local Port—Local UDP port through which the device is offering the service.
• Application Instance—The service instance of the UDP service. (For
example, when two senders send data to the same destination.)
This section describes storm control It covers the following topics:
• Storm Control
• Storm Control Statistics
When Broadcast, Multicast, or Unknown Unicast frames are received, they are
duplicated, and a copy is sent to all possible egress ports. This means that in
practice they are sent to all ports belonging to the relevant VLAN. In this way, one
ingress frame is turned into many, creating the potential for a traffic storm.
Storm protection enables you to limit the number of frames entering the device
and to define the types of frames that are counted towards this limit.
When the rate of Broadcast, Multicast, or Unknown Unicast frames is higher than
the user-defined threshold, frames received beyond the threshold are discarded.
Storm Control
To define Storm Control:
Click Security > Storm Control > Storm Control Settings.
Select a port and click Edit.
Enter the parameters.
• Interface—Select the port for which storm control is enabled.
• Unicast Storm Control
- Storm Control State—Select to enable Storm Control for Unicast
packets.
- Rate Threshold—Enter the maximum rate at which unknown packets can
be forwarded. This value can be entered by kbits/sec or by percentage
of the total available bandwidth.
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