Specifications

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0XO(15.1(1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
spanning-tree mode
spanning-tree mo de
To switch between PVST+ and MST modes , use the spanning-tree mode command. To return to the
default settings, use the no form of this command.
spanning-tree mode {pvst | mst | rapid-pvst}
no spanning-tree mode {pvst | mst | rapid-pvst }
Syntax Description
Defaults P VST+ mode
Command Modes Global c onfiguratio n mode
Usage Guidelines
Caution Be careful when using the spanning-tree mode command to switch between PVST+ and MST modes.
When you enter the command, all spa nning-tree instanc es are stopped for the previous mode and
restarted in the new mode. Using this command may cause disruption of user traffic.
Examples This exampl e shows how to switch to MST mode:
Switch(config)# spanning-tree mode mst
Switch(config)#
This example shows how to return to the default mode (PVST):
Switch(config)# no spanning-tree mode
Switch(config)#
Related Commands
pvst Specifies PVST+ mode.
mst S pecifies MST mode.
rapid-pvst Specifies Rapid PVST mode.
Command Description
show spanning-tree mst Displays MST proto col information.