ZyXEL Communications 4728F User Manual

 Chapter 19 Port Security

XGS-4526/4528F/4728F User’s Guide

Use this screen to set the MAC address learning limit on per-port and per-VLAN 
basis. Click VLAN MAC Address Limit in the Advanced Application > Port 
Security screen to display the screen as shown. 

Figure 86   Advanced Application > Port Security > VLAN MAC Address Limit 

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 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” in the 
XGS-4728F and from “0” to “8192” in the XGS-4526 or XGS-4528F. “0” 
means this feature is disabled.

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.

Table 47   Advanced Application > Port Security  (continued)