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10 STORM CONTROL CONFIGURATION
Use the Traffic > Storm Control page to configure broadcast, multicast, and
unknown unicast storm control thresholds. Broadcast storms may occur
when a device on your network is malfunctioning, or if application
programs are not well designed or properly configured. If there is too much
broadcast traffic on your network, performance can be severely degraded
or everything can come to complete halt.
You can protect your network from traffic storms by setting a threshold for
broadcast, multicast or unknown unicast traffic. Any packets exceeding the
specified threshold will then be dropped.
CLI REFERENCES
◆ "switchport packet-rate" on page 727
COMMAND USAGE
◆ Broadcast Storm Control is enabled by default.
◆ Broadcast control does not effect IP multicast traffic.
◆ When traffic exceeds the threshold specified for broadcast and
multicast or unknown unicast traffic, packets exceeding the threshold
are dropped until the rate falls back down beneath the threshold.
◆ The rate limits set by this function are also used by automatic storm
control when the control response is set to rate limiting by the auto-
traffic-control action command.
◆ Using both rate limiting and storm control on the same interface may
lead to unexpected results. For example, suppose broadcast storm
control is set to 500 Kbps by the command “switchport broadcast
packet-rate 500,” and
the rate limit is set to 20000 Kbps by the
command “rate-limit input 20000"
on a Fast Ethernet port. Since 20000
Kbps is 1/5 of line speed (100 Mbps), the received rate will actually be
100 Kbps, or 1/5 of the 500 Kbps limit set by the storm control
command. It is therefore not advisable to use both of these commands
on the same interface.
PARAMETERS
These parameters are displayed:
◆ Interface – Displays a list of ports or trunks.
◆ Type – Indicates interface type. (100Base-TX, 100Base-T,
100Base SFP, 1000Base SFP)
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