D-Link DGS-3426P Product Manual - Page 287

xStack® DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch NOTE: Ports that are in the Shutdown (Forever) mode will be seen as Discarding in Spanning Tree windows and implementations though these ports will still be forwarding BPDUs to the Switch's CPU. NOTE: Ports that are in Shutdown (Forever) mode will be seen as link down in all windows and screens until the user recovers these ports. Port Security Port Security Settings 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 this window, click Security > Port Security > Port Security Settings, as shown below: The following parameters can be set: Figure 6 - 3 Port Security Settings window Parameter Description Unit Choose the Switch ID number of the Switch in the switch stack to be modified. 278