Reference Guide

304 Spanning-Tree Commands
www.dell.com | support.dell.com
Default Configuration
STP is enabled.
Command Modes
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. To return to the default configuration,
use the no form of this command.
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 15 seconds.
Command Modes
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