Spanning-Tree Priority; Spanning-Tree Tcnguard - Dell PowerEdge M420 Reference Manual

spanning-tree priority

Use the spanning-tree priority command in Global Configuration mode to
configure the spanning-tree priority. The priority value is used to determine
which bridge is elected as the root bridge. To reset the default spanning-tree
priority use the no form of this command.
Syntax
priority
spanning-tree priority
no spanning-tree priority
priority — Priority of the bridge. (Range: 0–61440)
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Default Configuration
The default bridge priority for IEEE STP is 32768.
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.
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
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Spanning Tree Commands