Quick Reference Guide

374 Spanning-Tree Commands
www.dell.com | support.dell.com
DELL CONFIDENTIAL – PRELIMINARY 5/15/12 – FOR PROOF ONLY
Default Configuration
The default maximum age for IEEE Spanning Tree Protocol (STP) is 20 seconds.
Command Mode
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. Use the no form of this command to return to the default configuration.
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 Mode
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