ZyXEL Communications XS1920 Series, Руководство пользователя

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Chapter 19 Port Security
XS1920 Series User’s Guide
165
19.3 VLAN MAC Address Limit
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 116
Advanced Application > Port Security > VLAN MAC Address Limit
The following table describes the labels in this screen.
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 “16384”. “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 69
Advanced Application > Port Security (continued)
LABEL DESCRIPTION
Table 70
Advanced Application > Port Security > VLAN MAC Address Limit
LABEL DESCRIPTION
Active Select this option to activate this rule.
Port Enter the number of the port to which this rule is applied.
VID Enter the VLAN identification number.
Limit Number Use this field to limit the number of (dynamic) MAC addresses that may be learned on a
port in a specified VLAN. 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.