Cisco IE-3000-8TC Command Reference - Page 544
spanning-tree mode
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spanning-tree mode Chapter 2 IE 3000 Switch Cisco IOS Commands 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 mst pvst rapid-pvst Enable MST and Rapid Spanning Tree Protocol (RSTP) (based on IEEE 802.1s and IEEE 802.1w). Enable PVST+ (based on IEEE 802.1D). Enable rapid PVST+ (based on IEEE 802.1w). Defaults The default mode is PVST+. Command Modes Global configuration Command History Release 12.2(44)EX Modification This command was introduced. 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. 2-518 Cisco IE 3000 Switch Command Reference OL-13019-01
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