Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 571
Configuring an EdgePort
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Port Cost 25-Gigabit Ethernet interfaces 40-Gigabit Ethernet interfaces 50-Gigabit Ethernet interfaces 100-Gigabit Ethernet interfaces Port Channel with 100 Mb/s Ethernet interfaces Port Channel with 1-Gigabit Ethernet interfaces Port Channel with 10-Gigabit Ethernet interfaces Port Channel with 25-Gigabit Ethernet interfaces Port Channel with 50-Gigabit Ethernet interfaces Port Channel with 100-Gigabit Ethernet interfaces Default Value 1700 1400 1200 200 180000 18000 1800 1200 200 180 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 shutdown-on-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. • Enable EdgePort on an interface. INTERFACE mode spanning-tree mstp edge-port [bpduguard | shutdown-on-violation] Dell Networking OS Behavior: Regarding bpduguard shutdown-on-violation behavior: Multiple Spanning Tree Protocol (MSTP) 571
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