Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 347

Table 19-2. MSTP Default Port Cost Values Port Cost Port Channel with two 10-Gigabit Ethernet interfaces Port Channel with two 40-Gigabit Ethernet interfaces Default Value 1800 600 To change the port cost or priority of an interface, use the following commands: Task Change the port cost of an interface. Range: 0 to 2000000 Default: refer to Table 19-2. Change the port priority of an interface. Range: 0 to 240, in increments of 16 Default: 128 Command Syntax spanning-tree msti number cost cost Command Mode INTERFACE spanning-tree msti number priority priority INTERFACE To view the current values for these interface parameters, use the show config command from INTERFACE mode (Figure 19-9). Configure 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 shutdown-on-violation option causes the interface hardware to be shutdown when it receives a BPDU. When you only implement 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. The enabling of BPDU Filtering stops sending and receiving of BPDUs on the port fast enabled ports. When both BPDU guard and BPDU filter are enabled on the port, BPDU filter takes the higher precedence. By default, BPDU filtering on an interface is disabled. To enable EdgePort on an interface, use the following command: Task Enable EdgePort on an interface. Command Syntax Command Mode spanning-tree mstp edge-port [bpduguard [shutdown-on-violation] | bpdufilter] INTERFACE Multiple Spanning Tree Protocol (MSTP) | 345