Setup Guide

The following is the example configuration:
DELLEMC(conf)#protocol spanning-tree pvst
DELLEMC(conf-pvst)#port-channel path-cost custom
This command is support in all STP modes such as STP, RSTP, MSTP, and PVST.
To change the path cost to achieve new IEEE standard behavior, use no port-channel path-cost custom command.
Dell EMC Networking OS behavior does not change when a new member port is added to the port-channel or an existing member port is
deleted from the configuration. The path cost reflects the cumulative speed of the port-channel member ports.
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-te-1/1/1)#spanning-tree mstp edge-port
DellEMC(conf-if-te-1/1/1)#show config
!
interface TenGigabitEthernet 1/1/1
no ip address
switchport
spanning-tree mstp edge-port
spanning-tree MSTI 1 priority 144
no shutdown
DellEMC(conf-if-te-1/1/1)#
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.
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Multiple Spanning Tree Protocol (MSTP)