Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 712

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-onviolation 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: • 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). • The reset linecard command does not clear the Error Disabled state of the port or the Hardware 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 spanningtree 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-3/41)#spanning-tree mstp edge-port Dell(conf-if-te-3/41)#show config ! interface TengigabitEthernet 3/41 no ip address switchport spanning-tree mstp edge-port spanning-tree MSTI 1 priority 144 Multiple Spanning Tree Protocol (MSTP) 712