Cisco Systems SRW248G4PK9NA User Manual

Configuring Port Security

Cisco Small Business 300 Series Managed Switch Administration Guide 

326

 

Click Security > Storm Control.

All the fields on this page are described in the Edit Storm Control page except for 
the Storm Control Rate Threshold (%). It displays the percent of the total 
available bandwidth for unknown Unicast, Multicast, and Broadcast packets 
before storm control is applied at the port. The default value is 10% of the 
maximum rate of the port and is set in the Edit Storm Control page.

Select a port and click Edit.

Enter the parameters.

•

Interface—Select the port for which storm control is enabled. 

•

Storm Control—Select to enable Storm Control.

•

Storm Control Rate Threshold—Enter the maximum rate at which unknown 
packets can be forwarded. The default for this threshold is 10,000 for FE 
devices and 100,000 for GE devices.

•

Storm Control Mode—Select one of the modes: 

-

Unknown Unicast, Multicast & Broadcast—Counts unknown Unicast, 
Broadcast, and Multicast traffic towards the bandwidth threshold.

-

Multicast & Broadcast—Counts Broadcast and Multicast traffic towards 
the bandwidth threshold.

-

Broadcast Only—Counts only Broadcast traffic towards the bandwidth 
threshold.

Click Apply. Storm control is modified, and the Running Configuration file is 
updated.

Network security can be increased by limiting access on a port to users with 
specific MAC addresses. The MAC addresses can be either dynamically learned 
or statically configured.

Port security monitors received and learned packets. Access to locked ports is 
limited to users with specific MAC addresses. 

Port Security has four modes: