API Guide

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 EMC 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).
○ 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).
To verify that EdgePort is enabled, use the show config command from INTERFACE mode.
DellEMC(conf-if-gi-3/11)#spanning-tree mstp edge-port
DellEMC(conf-if-gi-3/11)#show config
!
interface GigabitEthernet 3/11
no ip address
switchport
spanning-tree mstp edge-port
spanning-tree MSTI 1 priority 144
no shutdown
DellEMC(conf-if-gi-3/11)#
Flush MAC Addresses after a Topology Change
Dell EMC 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 EMC Networking OS systems.
502
Multiple Spanning Tree Protocol (MSTP)