Spanning-Tree Mode - Cisco Catalyst 3560-X Command Reference Manual

Chapter 2 Catalyst 3750-X and 3560-X Cisco IOS Commands

spanning-tree mode

Syntax Description
Defaults
Command Modes
Command History
Usage Guidelines
Caution
Examples
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Use the spanning-tree mode global configuration command on the switch stack or on a standalone
switch 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
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).
The default mode is PVST+.
Global configuration
Release
12.2(53)SE2
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. All stack members run
the same version of spanning-tree.
When you enable the MST mode, RSTP is automatically enabled.
Changing spanning-tree modes can disrupt traffic because all spanning-tree instances are stopped for the
previous mode and restarted in the new mode.
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.
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Modification
This command was introduced.
Catalyst 3750-X and 3560-X Switch Command Reference
spanning-tree mode
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