D-Link DGS-1510 User Manual - Page 149

DGS-1510 Series Gigabit Ethernet SmartPro Switch Web UI Reference Guide Parameter TX Hold Count Max Hops Description Enter the transmit hold count value here. This value must be between 1 and 10 times. By default, this value is 6 times. This value is used to set the maximum number of Hello packets transmitted per interval. Enter the maximum number of hops that are allowed. This value must be between 6 and 40 hops. By default, this value is 20 hops. This value is used to set the number of hops between devices in a spanning tree region before the BPDU (bridge protocol data unit) packet sent by the Switch will be discarded. Each switch on the hop count will reduce the hop count by one until the value reaches zero. The Switch will then discard the BDPU packet and the information held for the port will age out. Click the Apply button to accept the changes made. STP Port Settings This window is used to view and configure the STP port settings. To view the following window, click L2 Features > STP > STP Port Settings, as shown below: Figure 5-45 STP Port Settings Window The fields that can be configured are described below: Parameter Unit From Port / To Port Cost State Description Select the switch unit that will be used for this configuration here. Select the appropriate port range used for the configuration here. Enter the cost value here. This value must be between 1 and 200000000. This value defines a metric that indicates the relative cost of forwarding packets to the specified port list. Port cost can be set automatically or as a metric value. The default value is 0 (auto). Setting 0 for the external cost will automatically set the speed for forwarding packets to the specified port(s) in the list for optimal efficiency. The default port cost for a 100Mbps port is 200000 and the default port cost for a Gigabit port is 20000. The lower the number, the greater the probability the port will be chosen to forward packets. Select to enable or disable the STP port state. 138