Link Layer ProtocolThe path cost of a port is related to its link speed. The higher the link speed is, the lowerthe path cost should be configured. If the port is configured with the default path cost,STP will automatically detect the current link speed of the port and accordingly computethe path cost.Example# Configure the path cost of the Ethernet port 0 to 5.[3Com-Ethernet0]bridge-set stp port pathcost 58.1.24 bridge-set stp port prioritySyntaxbridge-set bridge-set stp port priority valueundo bridge-set bridge-set stp port priorityViewInterface viewParameterValue: Bridge port priority in the range of 0 to 255. By default, the bridge port priority is128.DescriptionUsing the bridge-set stp port priority command, you can configure the bridge portpriority. Using the undo bridge-set stp port priority command, you can restore thedefault bridge port priority.In the case that path costs of ports are the same, the port with lower ID has greaterchance to be the designated port. The port ID is comprised of Port Priority and PortNumber. The smaller the port priority, the smaller the bridge port ID will be. Changingthe bridge port priority will cause recomputation of the spanning tree. If all the bridgeports adopt the same priority, the smaller the port number, the smaller the port ID willbe.Example# Configure the priority of Ethernet port 0 to 5.[3Com-Ethernet0]bridge-set stp port priority 58.1.25 debugging bridgeSyntaxdebugging bridge159
