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Catalyst 2350 Switch Command Reference
OL-19055-01
Chapter 2 Catalyst 2350 Cisco IOS Commands
spanning-tree mode
spanning-tree mode
Use the
spanning-tree mode
global configuration command to enable per-VLAN spanning-tree plus
(PVST+), rapid PVST+, or multiple spanning tree (MST) on your switch. Use the
no
form of this
command to return to the default setting.
spanning-tree mode
{
mst
|
pvst
|
rapid-pvst
}
no spanning-tree mode
Syntax Description
Defaults
The default mode is PVST+.
Command Modes
Global configuration
Command History
Usage Guidelines
The switch supports PVST+, rapid PVST+, and MSTP, but only one version can be active at any time:
All VLANs run PVST+, all VLANs run rapid PVST+, or all VLANs run MSTP.
When you enable the MST mode, RSTP is automatically enabled.
Caution
Changing spanning-tree modes can disrupt traffic because all spanning-tree instances are stopped for the
previous mode and restarted in the new mode.
Examples
This example shows to enable MST and RSTP on the switch:
Switch(config)#
spanning-tree mode mst
This example shows to enable rapid PVST+ on the switch:
Switch(config)#
spanning-tree mode rapid-pvst
You can verify your setting by entering the
show running-config
privileged EXEC command.
mst
Enable MST and Rapid Spanning Tree Protocol (RSTP) (based on IEEE 802.1s and
IEEE 802.1w).
pvst
Enable PVST+ (based on IEEE 802.1D).
rapid-pvst
Enable rapid PVST+ (based on IEEE 802.1w).
Release
Modification
12.2(46)EY
This command was introduced.
