Reference Guide

768 | Rapid Spanning Tree Protocol (RSTP)
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Figure 43-7. EdgePort Enabled on Interface
Influencing RSTP Root Selection
The Rapid Spanning Tree Protocol determines the root bridge, but you can assign one bridge a lower
priority to increase the likelihood that it will be selected as the root bridge.
To change the bridge priority, use the following command:
A console message appears when a new root bridge has been assigned. Figure 43-8 shows the console
message after the
bridge-priority command is used to make R2 the root bridge.
Dell Networking OS Behavior: Regarding bpduguard shutdown-on-violation behavior:
1 If the interface to be shutdown is a port channel then all the member ports are disabled in the hardware.
2 When a physical port is added to a port channel already in error disable state, the new member port will also be disabled in
the hardware.
3 When a physical port is removed from a port channel in error disable state, the error disabled state is cleared on this
physical port (the physical port will be enabled in the hardware).
4 The
reset stack-unit command does not clear the error disabled state of the port or the hardware disabled state. The
interface continues to be disables in the hardware.
The error disabled state can be cleared with any of the following methods:
•Perform an shutdown command on the interface.
•Disable the shutdown-on-violation command on the interface ( no spanning-tree stp-id portfast [bpduguard |
[shutdown-on-violation]] ).
•Disable spanning tree on the interface (no spanning-tree in INTERFACE mode).
•Disabling global spanning tree (no spanning-tree in CONFIGURATION mode).
Task Command Syntax Command Mode
Assign a number as the bridge priority or designate it as the
primary or secondary root.
priority-value range: 0 to 65535. The lower the number
assigned, the more likely this bridge will become the root
bridge. The default is 32768. Entries must be multiples of
4096.
bridge-priority priority-value
PROTOCOL
SPANNING TREE
RSTP
Dell(conf-if-te-2/0)#show config
!
interface TenGigabitEthernet 2/0
no ip address
switchport
spanning-tree rstp edge-port
shutdown
Dell(conf-if-te-2/0)#
Indicates the interface is in EdgePort
mode