1-30Configuring the Maximum Transmission Rate of PortsRefer to Configuring the Maximum Port Rate in the section about root bridge configuration.Configuring Ports as Edge PortsRefer to Configuring Ports as Edge Ports in the section about root bridge configuration.Configuring Path Costs of PortsPath cost is a parameter related to the rate of a port. On an MSTP-enabled device, a port can havedifferent path costs in different MSTIs. Setting appropriate path costs allows VLAN traffic flows to beforwarded along different physical links, thus to achieve VLAN-based load balancing.The device can automatically calculate the default path cost; alternatively, you can also configure thepath cost for ports.Specifying a standard that the device uses when calculating the default path costYou can specify a standard for the device to use in automatic calculation for the default path cost. Thedevice supports the following standards:z dot1d-1998: The device calculates the default path cost for ports based on IEEE 802.1d-1998.z dot1t: The device calculates the default path cost for ports based on IEEE 802.1t.z legacy: The device calculates the default path cost for ports based on a private standard.Follow these steps to specify a standard for the device to use when calculating the default path cost:To do... Use the command... RemarksEnter system view system-view —Specify a standard for thedevice to use when calculatingthe default path costs for portsof the devicestp pathcost-standard{ dot1d-1998 | dot1t | legacy }OptionalThe default standard used bythe device is legacy..Table 1-7 Link speed vs. path costLink speed Duplex state 802.1d-1998 802.1t Private standard0 — 65535 200,000,000 200,00010 MbpsSingle PortAggregate Link 2 PortsAggregate Link 3 PortsAggregate Link 4 Ports1001001001002,000,0001,000,000666,666500,0002,0001,8001,6001,400100 MbpsSingle PortAggregate Link 2 PortsAggregate Link 3 PortsAggregate Link 4 Ports19191919200,000100,00066,66650,000200180160140
