ZyXEL Communications GS-3012F Series - Manual (Page 130)

Chapter 17 Port Security
GS-3012/GS-3012F User’s Guide
130
Figure 64 Port Security
The following table describes the labels in this screen.
Table 42 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 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 16K (16384 bytes). 0 means this feature is disabled, so the switch will learn
MAC addresses up to the global limit of 16K.