ZyXEL Communications metrogigabit switch manual 207, Make them

Chapter 19 Port Security

Table 50 Advanced Application > Port Security (continued)

LABEL	DESCRIPTION
*	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	MAC address learning reduces outgoing broadcast traffic. For MAC
Learning	address learning to occur on a port, the port itself must be active with
	address learning enabled.
Limited	Use this field to limit the number of (dynamic) MAC addresses that may
Number of	be learned on a port. For example, if you set this field to "5" on port 2,
Learned MAC	then only the devices with these five learned MAC addresses may access
Address	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 “16384”.
	“0” means this feature is disabled.
Alarm	Alarm threshold of learned MAC address.
Threshold
Apply	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.
Cancel	Click Cancel to begin configuring this screen afresh.

MGS3700-12C User’s Guide

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