Operation Manual – MSTPH3C S7500 Series Ethernet Switches Chapter 1 MSTP Configuration1-251.3.2 MST Region ConfigurationRefer to section MST Region Configuration.1.3.3 MSTP Operation Mode ConfigurationRefer to section MSTP Operation Mode Configuration.1.3.4 Timeout Time Factor ConfigurationRefer to section Timeout Time Factor Configuration.1.3.5 Maximum Transmitting Speed ConfigurationRefer to section Maximum Transmitting Speed Configuration.1.3.6 Edge Port ConfigurationRefer to section Edge Port Configuration.1.3.7 Path Cost ConfigurationThe path cost parameters reflects the link rates on ports. For a port on anMSTP-enabled switch, the path cost may differ with MSTIs. You can enable flows ofdifferent VLANs to travel along different physical links by configuring appropriate pathcosts on ports, so that load balancing can be achieved by VLANs.Path costs can be determined by switches or through manual configuration.I. Standards for calculating path costs of portsCurrently, a switch can calculate the path costs of ports based on one of the followingstandards:z dot1d-1998: Adopts the IEEE 802.1D-1998 standard to calculate the default pathcosts of ports.z dot1t: Adopts the IEEE 802.1t standard to calculate the default path costs of ports.z legacy: Adopts the standard defined by private to calculate the default path costsof ports.Follow these steps to specify the standard for calculating path costs: