Administrator Guide

spanning-tree rstp edge-port
shutdown
Dell(conf-if-te-2/0)#
Influencing RSTP Root Selection
RSTP determines the root bridge, but you can assign one bridge a lower priority to increase the likelihood that
it is selected as the root bridge.
To change the bridge priority, use the following command.
• Assign a number as the bridge priority or designate it as the primary or secondary root.
PROTOCOL SPANNING TREE RSTP mode
bridge-priority priority-value
• priority-value The range is from 0 to 65535. The lower the number assigned, the more likely this
bridge becomes the root bridge.
The default is 32768. Entries must be multiples of 4096.
Example of the bridge-priority Command
A console message appears when a new root bridge has been assigned. The following example example
shows the console message after the bridge-priority command is used to make R2 the root bridge
(shown in bold).
Dell(conf-rstp)#bridge-priority 4096
04:27:59: %RPM0-P:RP2 %SPANMGR-5-STP_ROOT_CHANGE: RSTP root changed. My Bridge ID:
4096:0001.e80b.88bd
Old Root: 32768:0001.e801.cbb4 New Root: 4096:0001.e80b.88bd
SNMP Traps for Root Elections and
Topology Changes
To enable SNMP traps for RSTP, MSTP, and PVST+ collectively, use the following command.
Enable SNMP traps for RSTP, MSTP, and PVST+ collectively.
snmp-server enable traps xstp
Configuring Fast Hellos for Link State
Detection
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.
Rapid Spanning Tree Protocol (RSTP) 782