Guidelines and Limitations for Traffic Storm Control
When configuring the traffic storm control level, follow these guidelines and limitations:
•
You can configure traffic storm control on a port-channel interface.
•
Specify the level as a percentage of the total interface bandwidth:
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The level can be from 0 to 100.
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The optional fraction of a level can be from 0 to 99.
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100 percent means no traffic storm control.
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0.0 percent suppresses all traffic.
•
There are local link and hardware limitations that prevent storm-control drops from being counted
separately. Instead, storm-control drops are counted with other drops in the discards counter.
•
Because of hardware limitations and the method by which packets of different sizes are counted, the
level percentage is an approximation. Depending on the sizes of the frames that make up the incoming
traffic, the actual enforced level might differ from the configured level by several percentage points.
•
Applying storm control over a HIF range is not recommended. The configuration might fail for one or
more interfaces in the range depending on the hardware resource availability. The result of the command
is partial success in some cases.
•
In the Cisco Nexus 5000 switch, storm-control does not distinguish between IP, non-IP, registered, or
unregistered multicast traffic. All multicast traffic is subject to a single-multicast storm control policer
when configured.
•
In the Cisco Nexus 5500 switch, storm-control is applied only to unregistered or unknown multicast
MAC address.
•
The link-level control protocols (LACP, LLDP and so on) are not affected in case of a traffic storm. The
storm control is applied to data plane traffic only.
•
The burst size values are:
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For a 10G port, 48.68 Mbytes/390Mbits
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For a 1G port, 25 Mbytes/200Mbits
Configuring Traffic Storm Control
You can set the percentage of total available bandwidth that the controlled traffic can use.
Traffic storm control uses a 10-microsecond interval that can affect the operation of traffic storm control.
Note
Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
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Configuring Traffic Storm Control
Guidelines and Limitations for Traffic Storm Control
