ZyXEL Communications GS-2750, User Manual

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Chapter 17 Port Security
GS-2750 User’s Guide
142
Figure 67 Advanced Application > Port Security
The following table describes the labels in this screen.
Table 41 Advanced Application > Port Security
LABEL DESCRIPTION
Active Select this option to enable port security on the Switch.
Port This field displays a 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 address(es) is in the MAC address table on this port.
Packets with no matching MAC address(es) 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 Switch Setup screen. The valid range is from “0” to
“8192”. “0” means this feature is disabled.