D-Link DGS-3426P Product Manual - Page 35

xStack® DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch State Flow Control Learning Medium Type Speed/Duplex Capability Advertised Toggle the State field to either enable or disable a given port or group of ports. Displays the flow control scheme used for the various port configurations. Ports configured for full-duplex use 802.3x flow control, half-duplex ports use backpressure flow control, and Auto ports use an automatic selection of the two. The default is Disabled. Enable or disable MAC address learning for the selected ports. When Enabled, destination and source MAC addresses are automatically listed in the forwarding table. When learning is Disabled, MAC addresses must be manually entered into the forwarding table. This is sometimes done for reasons of security or efficiency. See the section on Forwarding/Filtering for information on entering MAC addresses into the forwarding table. The default setting is Enabled. If configuring the Combo ports, this defines the type of transport medium to be used, whether copper or fiber. Use the Speed/Duplex pull-down menu to select the speed and duplex/half-duplex state of the port. Auto denotes auto-negotiation between 10 and 1000 Mbps devices, in full- or half-duplex. The Auto setting allows the port to automatically determine the fastest settings the device the port is connected to can handle, and then to use those settings. Options are Auto, 10M/Half, 10M/Full, 100M/Half, 100M/Full, 1000M/Full_Master and 1000M/Full_Slave, and 1000M/Full. There is no automatic adjustment of port settings with any option other than Auto. The Switch allows the user to configure two types of gigabit connections; 1000M/Full_Master and 1000M/Full_Slave. Gigabit connections only support full duplex connections and take on certain characteristics that are different from the other choices listed. The 1000M/Full_Master and 1000M/Full_Slave parameters refer to connections running a 1000BASE-T cable for connection between the Switch port and other device capable of a gigabit connection. The master setting (1000M/Full_Master) will allow the port to advertise capabilities related to duplex, speed and physical layer type. The master setting will also determine the master and slave relationship between the two connected physical layers. This relationship is necessary for establishing the timing control between the two physical layers. The timing control is set on a master physical layer by a local source. The slave setting (1000M/Full_Slave) uses loop timing, where the timing comes form a data stream received from the master. If one connection is set for 1000M/Full_Master, the other side of the connection must be set for 1000M/Full_Slave. Any other configuration will result in a link down status for both ports. The speed and duplex capability are advertised during auto negotiation. If the speed of a port is set to auto, this defines the speed and duplex that the port can be supported. The partner can determine the speed and duplex according to the information. Auto Negotiation Tick the check box to restart auto negotiation. Click Apply to implement the new settings on the Switch. Port Error Disabled The following window will display the information about ports that have had their connection status disabled, for reasons such as STP loopback detection or link down status. To view this window, click Administration > Port Configuration > Port Error Disabled, as shown below. 26