ZyXEL Communications ES-2108, User Manual, Page: 132 / 284

Chapter 17 Port Security
ES-2108 Series User’s Guide
132
Figure 70 Advanced Application > Port Security
The following table describes the labels in this screen.
Table 38 Advanced Application > Port Security
LABEL DESCRIPTION
Active Select this check box to enable the port security feature 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 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 (activated in the
Basic
Settings , Port Setup screen) 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
would have to wait until one of the five learned MAC addresses aged out. MAC
address aging out time can be set in the
Switch Setup screen. The valid range is
from “0” to “8192”. “0” means that the limiting of learned addresses is disabled.