Operation Manual – MSTPH3C S3100 Series Ethernet Switches Chapter 1 MSTP Configuration1-371.4.1 Configuration PrerequisitesThe role (root, branch, or leaf) of each switch in each spanning tree instance isdetermined.1.4.2 Configuring the MST RegionRefer to section 1.3.2 “Configuring an MST Region”.1.4.3 Configuring the Mode a Port Recognizes and Sends MSTP PacketsRefer to section 1.3.5 “Configuring the Mode a Port Recognizes and Sends MSTPPackets”.1.4.4 Configuring the Timeout Time FactorRefer to section 1.3.10 “Configuring the Timeout Time Factor”.1.4.5 Configuring the Maximum Transmitting Speed on the Current PortRefer to section 1.3.11 “Configuring the Maximum Transmitting Speed on the CurrentPort”.1.4.6 Configuring a Port as an Edge PortRefer to section 1.3.12 “Configuring the Current Port as an Edge Port”.1.4.7 Configuring the Path Cost for a PortThe path cost parameter reflects the rate of the link connected to the port. For a port onan MSTP-enabled switch, the path cost may be different in different spanning treeinstances. You can enable flows of different VLANs to travel along different physicallinks by configuring appropriate path costs on ports, so that VLAN-based loadbalancing can be implemented.Path cost of a port can be determined by the switch 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 proprietary standard to calculate the default path costs ofports.
