598 | Multiple Spanning Tree Protocol (MSTP)w w w . d e l l . c o m | s u p p o r t . d e l l . c o mTo change the port cost or priority of an interface:View the current values for these interface parameters using the command show config from INTERFACEmode. See Figure 27-8.Configure an EdgePortThe EdgePort feature enables interfaces to begin forwarding traffic approximately 30 seconds sooner. Inthis mode an interface forwards frames by default until it receives a BPDU that indicates that it shouldbehave otherwise; it does not go through the Learning and Listening states. The bpduguardshutdown-on-violation option causes the interface hardware to be shutdown when it receives a BPDU.When only bpduguard is implemented, although the interface is placed in an Error Disabled state whenreceiving the BPDU, the physical interface remains up and spanning-tree will drop packets in the hardwareafter a BPDU violation. BPDUs are dropped in the software after receiving the BPDU violation. Thisfeature is the same as PortFast mode in Spanning Tree.To enable EdgePort on an interface, use the following command:10-Gigabit Ethernet interfaces 2000Port Channel with 100 Mb/s Ethernet interfaces 180000Port Channel with 1-Gigabit Ethernet interfaces 18000Port Channel with 10-Gigabit Ethernet interfaces 1800Task Command Syntax Command ModeChange the port cost of an interface.Range: 0 to 200000Default: see Table 27-2.spanning-tree msti number cost cost INTERFACEChange the port priority of an interface.Range: 0 to 240, in increments of 16Default: 128spanning-tree msti number prioritypriorityINTERFACECaution: Configure EdgePort only on links connecting to an end station. EdgePort can cause loops if it is enabledon an interface connected to a network.Task Command Syntax Command ModeEnable EdgePort on an interface. spanning-tree mstp edge-port[bpduguard |shutdown-on-violation]INTERFACETable 27-2. MSTP Default Port Cost ValuesPort Cost Default Value
