Chapter 17 Port Security
Figure 64 Port Security
The following table describes the labels in this screen.
Table 42 Port Security
LABEL | DESCRIPTION |
Active | Select this check box to enable the port security feature on the switch. |
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Port | This field displays a port number. |
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* | 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 |
| basis. |
| Note: Changes in this row are copied to all the ports as soon as you |
| make them. |
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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. |
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Address | MAC address learning reduces outgoing broadcast traffic. For MAC address learning |
Learning | to occur on a port, the port itself must be active with address learning enabled. |
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Limited | Use this field to limit the number of (dynamic) MAC addresses that may be learned |
Number of | on a port. For example, if you set this field to "5" on port 2, then only the devices with |
Learned MAC | these five learned MAC addresses may access port 2 at any one time. A sixth device |
Address | 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 (16384 bytes). 0 means this feature is disabled, so the switch will learn |
| MAC addresses up to the global limit of 16K. |
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