Administrator Guide

Layer 2 Switching Commands 782
Command Mode
Global Configuration mode
User Guidelines
The priority value must be a multiple of 4096.
The switch with the lowest priority is the root of the spanning tree.
Bridge priority configuration is given preference over root primary/secondary
configuration. Root primary/secondary configuration is given preference over
DRC configuration.
Example
The following example configures spanning-tree priority to 12288.
console(config)#spanning-tree priority 12288
spanning-tree tcnguard
Use the spanning-tree tcnguard command to prevent a port from propagating
topology change notifications. Use the “no” form of the command to enable
TCN propagation.
Syntax
spanning-tree tcnguard
no spanning-tree tcnguard
Default Configuration
TCN propagation is disabled by default.
Command Mode
Interface Configuration (Ethernet, Port Channel) mode
User Guidelines
There are no user guidelines for this command.
2CSNXXX_SWUM204.book Page 782 Monday, January 25, 2016 1:25 PM