Spanning-Tree Mode - Cisco 4500M Command Reference Manual

Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches

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
Defaults
PVST+ mode
Command Modes
Configuration
Command History Release
12.1(8a)EW
12.1(19)EW
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 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
This example 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
show spanning-tree mst
78-16201-01
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
Support for this command was introduced on the Catalyst 4500 series switch.
Support for the rapid-pvst keyword.
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
spanning-tree mode
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