Storm Control - Cisco 350 Series Administration Manual

Security

Storm Control

Storm Control
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
• Local IP Address—Local IP address through which the device is offering the service.
• Local Port—Local TCP port through which the device is offering the service.
• Remote IP Address—IP address of the remote device that is requesting the service.
• Remote Port—TCP port of the remote device that is requesting the service.
• State—Status of the service.
The UDP Service table displays the following information:
• Service Name—Access method through which the device is offering the UDP service.
• Type—IP protocol the service uses.
• Local IP Address—Local IP address through which the device is offering the service.
• 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.
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