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Cisco ME 3800X and ME 3600X Switch Command Reference
OL-28238-01
Chapter
spanning-tree mode
spanning-tree mode
To enable per-VLAN spanning-tree plus (PVST+), rapid PVST+, or multiple spanning tree (MST), use
the spanning-tree mode command in global configuration mode. To return to the default setting, use the
no form of this command.
spanning-tree mode {mst | pvst | rapid-pvst}
no spanning-tree mode
Syntax Description
Defaults The default mode is rapid 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.
You can verify your setting by entering the show running-config privileged EXEC command.
Examples This example shows to enable MST and RSTP on the switch:
Switch(config)# spanning-tree mode mst
This example shows to enable PVST+ on the switch:
Switch(config)# spanning-tree mode pvst
Related Commands
mst Enables MST and Rapid Spanning Tree Protocol (RSTP) (based on IEEE 802.1s and
IEEE 802.1w).
pvst Enables PVST+ (based on IEEE 802.1D).
rapid-pvst Enables rapid PVST+ (based on IEEE 802.1w).
Release Modification
12.2(52)EY This command was introduced.
Command Description
show running-config Displays the operating configuration.
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