D-Link DGS-3426 User Manual - Page 219

xStack DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch Port Security A given port's (or a range of ports') dynamic MAC address learning can be locked such that the current source MAC addresses entered into the MAC address forwarding table can not be changed once the port lock is enabled. The port can be locked by using the Admin State pull-down menu to Enabled, and clicking Apply. Port Security is a security feature that prevents unauthorized computers (with source MAC addresses) unknown to the Switch prior to locking the port (or ports) from connecting to the Switch's locked ports and gaining access to the network. To view the following window, click Security > Port Security > Port Security Entries. The following parameters can be set: Parameter Description Figure 10- 3. Port Security Settings and Table Unit Choose the Switch ID number of the Switch in the switch stack to be modified. From/To Admin State Max. Learning Addr. (0-16) Mode Clear A consecutive group of ports may be configured starting with the selected port. This pull-down menu allows the user to enable or disable Port Security (locked MAC address table for the selected ports). The number of MAC addresses that will be in the MAC address forwarding table for the selected switch and group of ports. This pull-down menu allows the option of how the MAC address table locking will be implemented on the Switch, for the selected group of ports. The options are: Permanent - The locked addresses will only age out after the Switch has been reset. DeleteOnTimeout - The locked addresses will age out after the aging timer expires. DeleteOnReset - The locked addresses will not age out until the Switch has been reset or rebooted. Click the to clear MAC address entries which were learned by the Switch by a specified port. This only relates to the port security function. This command will only take effect if the Mode is set as Permanent or DeleteonReset. 205