ZyXEL Communications ES3500-24 User Manual page 166

Chapter 19 Port Security
The following table describes the labels in this screen.
Table 52 Advanced Application > Port Security
LABEL
Port List
MAC freeze
Active
Port
*
Active
Address
Learning
Limited Number
of Learned MAC
Address
Apply
Cancel
166
DESCRIPTION
Enter the number of the port(s) (separated by a comma) on which you want to enable port
security and disable MAC address learning. After you click MAC freeze, all previously
learned MAC addresses on the specified port(s) will become static MAC addresses and
display in the Static MAC Forwarding screen.
Click MAC freeze to have the Switch automatically select the Active check boxes and clear
the Address Learning check boxes only for the ports specified in the Port list.
Select this option to enable port security on the Switch.
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.
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.
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.
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 "16384". "0" means this feature is
disabled.
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 Save link on the top navigation panel to
save your changes to the non-volatile memory when you are done configuring.
Click Cancel to begin configuring this screen afresh.
ES3500 Series User's Guide