Cisco Catalyst 4500 Series Configuration Manual page 1089

Chapter 2
spanning-tree mode
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.
Syntax Description
pvst
mst
rapid-pvst
Command Default PVST+ mode
Command Modes
Global configuration mode
Command History Release
12.1(8a)EW
12.1(19)EW
Usage Guidelines
Be careful when using the spanning-tree mode command to switch between PVST+ and MST modes.
Caution
When you enter the command, all spanning-tree instances are stopped for the previous mode and
restarted in the new mode. Using this command may cause disruption of user traffic.
Examples
The following example shows how to switch to MST mode:
Switch(config)# spanning-tree mode mst
Switch(config)#
The following example shows how to return to the default mode (PVST):
Switch(config)# no spanning-tree mode
Switch(config)#
Related Commands Command
show spanning-tree mst
spanning-tree mode {pvst | mst | rapid-pvst}
no spanning-tree mode {pvst | mst | rapid-pvst}
Specifies PVST+ mode.
Specifies MST mode.
Specifies Rapid PVST mode.
Modification
This command was introduced on the Catalyst 4500 series switch..
Support for the rapid-pvst keyword.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release XE 3.9.xE and 15.2(5)Ex
Description
Displays MST protocol information.
spanning-tree mode
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