Reference Guide

306 Spanning-Tree Commands
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Default Configuration
The default maximum age for IEEE Spanning Tree Protocol (STP) is 20 seconds.
Command Modes
Global Configuration mode
User Guidelines
• When configuring the maximum age, the following relationships should be kept:
– 2*(Forward-Time - 1) >= Max-Age
– Max-Age >= 2*(Hello-Time + 1)
Example
The following example configures the spanning tree bridge maximum-age to 10 seconds.
spanning-tree priority
The spanning-tree priority Global Configuration mode command configures the spanning tree
priority of the device. The priority value is used to determine which bridge is elected as the root
bridge. To return to the default configuration, use the no form of this command.
Syntax
spanning-tree priority priority
no spanning-tree priority
• priority — Priority of the bridge. (Range: 0 - 61440 in steps of 4096)
Default Configuration
The default bridge priority for IEEE Spanning Tree Protocol (STP) is 32768.
Command Modes
Global Configuration mode
User Guidelines
• The bridge with the lowest priority is elected as the root bridge.
Example
The following example configures spanning tree priority to 12288.
Console(config)# spanning-tree max-age 10
Console(config)# spanning-tree priority 12288