Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 572

• If the interface to be shut down is a port channel, all the member ports are disabled in the hardware. • When you add a physical port to a port channel already in the Error Disable state, the new member port is also disabled in the hardware. • When you remove a physical port from a port channel in the Error Disable state, the error disabled state is cleared on this physical port (the physical port is enabled 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 in INTERFACE mode). • Disabling global spanning tree (using the no spanning-tree command in CONFIGURATION mode). Example of Enabling an EdgePort on an Interface To verify that EdgePort is enabled, use the show config command from INTERFACE mode. Dell(conf-if-te-3/11)#spanning-tree mstp edge-port Dell(conf-if-te-3/11)#show config ! interface TenGigabitEthernet 3/11 no ip address switchport spanning-tree mstp edge-port spanning-tree MSTI 1 priority 144 no shutdown Dell(conf-if-te-3/11)# Flush MAC Addresses after a Topology Change Dell Networking OS has an optimized MAC address flush mechanism for RSTP, MSTP, and PVST+ that flushes 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 mstp command from EXEC Privilege mode. MSTP Sample Configurations The running-configurations support the topology shown in the following illustration. The configurations are from Dell Networking OS systems. 572 Multiple Spanning Tree Protocol (MSTP)