Cisco Cisco SG200-26P 26-port Gigabit PoE Smart Switch メンテナンスマニュアル

Storm Control

Cisco Small Business SF200E Series Advanced Smart Switch

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When the (Radius, None) or the (Radius, Local) option is selected, 

None or Local is used only if the Radius Server specified is incorrect or it is 
not specified; if it is correct, but the credentials are incorrect, the 
authentication fails and does not fall back to the None or the Local option.

Click Apply. Your changes are saved to the Running Configuration.

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:

Click Security > Storm Control in the navigation window.

Select the port to configure and click Edit.

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.