D-Link DXS-1210-12TC User Manual - Page 46

4 Configuration D-Link DXS-1210 Series User Manual 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. Bridge Hello Time (0-2): After selecting RSTP/STP as the STP Mode, this parameter will be available. Enter the bridge's hello time value here. This value must be between 1 and 2 seconds. By default, this value is 2 seconds. This is the interval between two transmissions of BPDU packets sent by the Root Bridge to tell all other switches that it is indeed the Root Bridge. This field will only appear here when STP or RSTP is selected for the STP Version. For MSTP, the Hello Time must be set on a port per port basis. TX Hop Count (1-10): Enter the transmit hold count value. 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. Click the Apply button to save your settings. L2 Features > STP > STP Port Settings STP can be set up on a port per port basis. In addition to setting Spanning Tree parameters for use on the switch level, the Switch allows for the configuration of groups of ports, each port-group of which will have its own spanning tree, and will require some of its own configuration settings. An STP Group spanning tree works in the same way as the switch-level spanning tree, but the root bridge concept is replaced with a root port concept. A root port is a port of the group that is elected based on port priority and port cost, to be the connection to the network for the group. Redundant links will be blocked, just as redundant links are blocked on the switch level. The STP on the switch level blocks redundant links between switches (and similar network devices). The port level STP will block redundant links within an STP Group. Figure 4.68 - L2 Features > STP > STP Port Settings From Port/To Port: Enter a consecutive group of ports to be configured starting with the selected port. Cost: This 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). 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. Default port cost: 100Mbps port = 200000. Gigabit port = 20000. Value 1-200000000 - Define a value between 1 and 200000000 to determine the external cost. The lower the number, the greater the probability the port will be chosen to forward packets. State: Select to enable or disable STP by per-port based. It will be selectable after the global STP is enabled. Guard Root: Select to enable or disable the guard root function. Link Type: Select the link type option. The options to choose from are Auto, P2P, and Shared. A full-duplex port is considered to have a point-to-point (P2P) connection. On the opposite, a half-duplex port is 40