Quick Reference Guide

372 Spanning-Tree Commands
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DELL CONFIDENTIAL – PRELIMINARY 5/15/12 – FOR PROOF ONLY
Default Configuration
STP is enabled.
Command Mode
Global Configuration mode.
User Guidelines
• In RSTP mode, the device uses STP when the neighbor device uses STP.
• In MSTP mode, the device uses RSTP when the neighbor device uses RSTP and uses STP when
the neighbor device uses STP.
Example
The following example configures the spanning-tree protocol to RSTP.
spanning-tree forward-time
The spanning-tree forward-time Global Configuration mode command configures the spanning-
tree bridge forward time, which is the amount of time a port remains in the listening and learning
states before entering the forwarding state. Use the no form of this command to return to the default
configuration.
Syntax
• spanning-tree forward-time seconds
• no spanning-tree forward-time
• seconds — Time in seconds. (Range: 4 - 30)
Default Configuration
The default forwarding time for the IEEE Spanning Tree Protocol (STP) is 5 seconds.
Command Mode
Global Configuration mode.
User Guidelines
• When configuring the forwarding time, the following relationship should be kept:
– 2*(Forward-Time - 1) >= Max-Age
console(config)# spanning-tree mode rstp