Security
Storm Control
Cisco Small Business SG200 Series 8-port Smart Switch 154
10
Storm Control
A traffic storm is the result of an excessive number of broadcast, multicast, or
unknown unicast messages simultaneously transmitted across a network by a
port. Forwarded message responses might create a loop and overload network
resources and cause the network to time-out.
The switch measures the incoming broadcast, multicast, or unknown unicast
packet rate per port and discards packets when a rate exceeds a defined value.
Storm control can be enabled or disabled on each interface.
Storm control is disabled by default on all ports for all packet types. Use the Storm
Control page to enable and configure storm control on the switch ports.
To display and configure storm control settings for a port:
STEP 1 Click Security > Storm Control in the navigation window.
STEP 2 Select the port to configure and click Edit.
STEP 3 For broadcast, multicast, and unicast traffic, specify the following storm control
parameters for the selected port:
• Mode—Select Enable to turn on storm control protection for the traffic type.
• Rate Threshold Type—Select the measurement the switch uses to
determine whether traffic exceeds the threshold:
- Percent—Traffic is dropped when it exceeds a percentage of the total
capability of the link.
- pps (packets per second—Traffic is dropped when it exceeds the set
number of packet-per-second on the link for this type of traffic.
• Rate Threshold—Specify the maximum rate at which this type of packet is
forwarded. If the Rate Threshold Type is Percent, enter a percentage of the
total port capability (0–100 percent). If the Rate Threshold Type is pps, enter
a packet per second rate (0–14880000). Ports that operate at 10 Mbps,
100 Mbps, or 1000 Mbps have a maximum throughput of 14880, pps
148800 pps, or 1488000 pps correspondingly.
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