ZyXEL Communications GS-4012F, User Manual

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GS-4012F User’s Guide
118 Chapter 17 Port Security
Table 33 Port Security
LABEL DESCRIPTION
Active Select this check box to enable port security on the switch.
Port This field displays a port number.
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. “0” means this feature is disabled, so the switch will learn MAC
addresses up to the global limit of 16K.
Apply Click Apply to save your changes back to the switch.
Cancel Click Cancel to begin configuring this screen afresh.