Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 666

• Port priority influences the likelihood that a port is selected to be a forwarding port in case that several ports have the same port cost. The following lists the default values for port cost by interface. Table 57. Default Values for Port Costs by Interface Port Cost Default Value 100-Mb/s Ethernet interfaces 200000 1-Gigabit Ethernet interfaces 20000 10-Gigabit Ethernet interfaces 2000 Port Channel with 100 Mb/s Ethernet interfaces 180000 Port Channel with 1-Gigabit Ethernet interfaces 18000 Port Channel with 10-Gigabit Ethernet interfaces 1800 To change the port cost or priority of an interface, use the following commands. 1. Change the port cost of an interface. INTERFACE mode spanning-tree msti number cost cost The range is from 0 to 200000. For the default, refer to the default values shown in the table.. 2. Change the port priority of an interface. INTERFACE mode spanning-tree msti number priority priority The range is from 0 to 240, in increments of 16. The default is 128. To view the current values for these interface parameters, use the show config command from INTERFACE mode. Configuring an EdgePort The EdgePort feature enables interfaces to begin forwarding traffic approximately 30 seconds sooner. In this mode, an interface forwards frames by default until it receives a BPDU that indicates that it should behave otherwise; it does not go through the Learning and Listening states. The bpduguard shutdownon-violation option causes the interface hardware to be shut down when it receives a BPDU. When you implement only bpduguard, although the interface is placed in an Error Disabled state when receiving the BPDU, the physical interface remains up and spanning-tree drops packets in the hardware after a BPDU violation. BPDUs are dropped in the software after receiving the BPDU violation. This feature is the same as PortFast mode in spanning tree. CAUTION: Configure EdgePort only on links connecting to an end station. EdgePort can cause loops if you enable it on an interface connected to a network. To enable EdgePort on an interface, use the following command. 666 Multiple Spanning Tree Protocol (MSTP)