• Enable EdgePort on an interface.INTERFACE modespanning-tree mstp edge-port [bpduguard | shutdown-on-violation]Dell Networking OS Behavior: Regarding bpduguard shutdown-on-violation behavior:– If the interface to be shut down is a port channel, all the member ports are disabled in thehardware.– When you add a physical port to a port channel already in the Error Disable state, the new memberport is also disabled in the hardware.– When you remove a physical port from a port channel in the Error Disable state, the error disabledstate is cleared on this physical port (the physical port is enabled in the hardware).– The reset linecard command does not clear the Error Disabled state of the port or theHardware Disabled state. The interface continues to be disabled in the hardware.– You can clear the Error Disabled state with any of the following methods:* Use the shutdown command on the interface.* Disable the shutdown-on-violation command on the interface (using the no spanning-tree stp-id portfast [bpduguard | [shutdown-on-violation]] command).* Disable spanning tree on the interface (using the no spanning-tree command inINTERFACE mode).* Disabling global spanning tree (using the no spanning-tree command in CONFIGURATIONmode).Example of Enabling an EdgePort on an InterfaceTo verify that EdgePort is enabled, use the show config command from INTERFACE mode.Dell(conf-if-te-3/11)#spanning-tree mstp edge-portDell(conf-if-te-3/11)#show config!interface TenGigabitEthernet 3/11no ip addressswitchportspanning-tree mstp edge-portspanning-tree MSTI 1 priority 144no shutdownDell(conf-if-te-3/11)#Flush MAC Addresses after a Topology ChangeDell Networking OS has an optimized MAC address flush mechanism for RSTP, MSTP, and PVST+ thatflushes addresses only when necessary, which allows for faster convergence during topology changes.However, you may activate the flushing mechanism defined by 802.1Q-2003 using the tc-flush-standard command, which flushes MAC addresses after every topology change notification.To view the enable status of this feature, use the show running-config spanning-tree mstpcommand from EXEC Privilege mode.MSTP Sample ConfigurationsThe running-configurations support the topology shown in the following illustration.The configurations are from Dell Networking OS systems.Multiple Spanning Tree Protocol (MSTP) 521
