Administrator Guide

CAUTION: Configure EdgePort only on links connecting to an end station. If you enable EdgePort on an interface
connected to a network, it can cause loops.
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:
○ Perform an shutdown command on the interface.
○ Disable the shutdown-on-violation command on the interface (the no spanning-tree stp-id portfast
[bpduguard | [shutdown-on-violation]] command).
○ Disable spanning tree on the interface (the no spanning-tree command in INTERFACE mode).
○ Disable global spanning tree (the no spanning-tree command in CONFIGURATION mode).
To enable EdgePort on an interface, use the following command.
● Enable EdgePort on an interface.
INTERFACE mode
spanning-tree rstp edge-port [bpduguard | shutdown-on-violation]
To verify that EdgePort is enabled on a port, use the show spanning-tree rstp command from EXEC privilege mode or
the show config command from INTERFACE mode.
NOTE: Dell EMC Networking recommends using the show config command from INTERFACE mode.
In the following example, the bold line indicates that the interface is in EdgePort mode.
DellEMC(conf-if-gi-2/1)#show config
!
interface GigabitEthernet 2/1
no ip address
switchport
spanning-tree rstp edge-port
shutdown
DellEMC(conf-if-gi-2/1)#
Configuring Fast Hellos for Link State Detection
Use RSTP fast hellos to achieve sub-second link-down detection so that convergence is triggered faster. The standard RSTP
link-state detection mechanism does not offer the same low link-state detection speed.
To achieve sub-second link-down detection so that convergence is triggered faster, use RSTP fast hellos. The standard RSTP
link-state detection mechanism does not offer the same low link-state detection speed.
RSTP fast hellos decrease the hello interval to the order of milliseconds and all timers derived from the hello timer are adjusted
accordingly. This feature does not inter-operate with other vendors, and is available only for RSTP.
● Configure a hello time on the order of milliseconds.
PROTOCOL RSTP mode
hello-time milli-second interval
The range is from 50 to 950 milliseconds.
DellEMC(conf-rstp)#do show spanning-tree rstp brief
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 0, Address 0001.e811.2233
Root Bridge hello time 50 ms, max age 20, forward delay 15
Bridge ID Priority 0, Address 0001.e811.2233
We are the root
Configured hello time 50 ms, max age 20, forward delay 15
704
Rapid Spanning Tree Protocol (RSTP)