Chapter 19 Port Security
GS2220 Series User’s Guide
204
The following table describes the labels in this screen.
Table 85 Advanced Application > Port Security
LABEL DESCRIPTIO N
Port List Enter the number of the ports (separated by a comma) on which you want to enable port
security and disable MAC address learning. After you click MAC fre e ze , all previously learned
MAC addresses on the specified ports will become static MAC addresses and display in the
Sta tic MAC Fo rwa rding screen.
MAC freeze Click MA C fre e ze to have the Switch automatically select the Ac tive check boxes and clear
the Addre ss Le a rning check boxes only for the ports specified in the Po rt List.
Active Select this option to enable port security on the Switch.
Port This field displays the port number.
* Settings in this row apply to all ports.
Use this row only if you want to make some of the settings the same for all ports. Use this row first
to set the common settings and then make adjustments on a port-by-port basis.
Note: Changes in this row are copied to all the ports as soon as you make them.
Active Select this check box to enable the port security feature on this port. The Switch forwards
packets whose MAC addresses is in the MAC address table on this port. Packets with no
matching MAC addresses are dropped.
Clear this check box to disable the port security feature. The Switch forwards all packets on this
port.
Address Learning MAC address learning reduces outgoing broadcast traffic. For MAC address learning to occur
on a port, the port itself must be active with address learning enabled.
Limited Number
of Learned MAC
Address
Use this field to limit the number of (dynamic) MAC addresses that may be learned on a port.
For example, if you set this field to "5" on port 2, then only the devices with these five learned
MAC addresses may access port 2 at any one time. A sixth device must wait until one of the
five learned MAC addresses ages out. MAC address aging out time can be set in the Switc h
Se tup screen. The valid range is from “0” to “32K”. “0” means this feature is disabled.
Apply Click Apply to save your changes to the Switch’s run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the Sa ve link on the top navigation panel to
save your changes to the non-volatile memory when you are done configuring.
Cancel Click C a nc e l to begin configuring this screen afresh.
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