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Cisco ME 3400 Ethernet Access Switch Command Reference
OL-9640-07
Chapter 2 Cisco ME 3400 Ethernet Access Switch 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 rapid PVST+.
Command Modes Global configuration
Command History
Usage Guidelines Spanning Tree Protocol (STP) is supported on the switch only on network node interfaces (NNIs) or on
enhanced network interfaces (ENIs) on which STP has been enabled. To set a port as an NNI or ENI,
enter the port-type {eni | nni} interface configuration command. To enable STP on an ENI, enter the
spanning-tree interface configuration command.
STP is not supported on user network interfaces (UNIs).
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 PVST+ on the switch:
Switch(config)# spanning-tree mode pvst
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(25)EX This command was introduced.
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