26.4.2 Setting of PVST +
- Points to note
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When the pvst or rapid-pvst operating mode is set, PVST+ automatically runs on port VLANs, but the mode can be changed and PVST+ can be set to start or stop per VLAN. The no spanning-tree vlan command is used to stop operation.
To prevent PVST+ operation for a newly created VLAN, use the no spanning-tree vlan command to set this before the VLAN is created.
Command examples
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(config)# no spanning-tree vlan 20
Stops VLAN 20 PVST+ operation.
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(config)# spanning-tree vlan 20
Runs the stopped VLAN 20 PVST+.
- Notes
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PVST+ runs automatically when nothing is displayed for the configuration. The no spanning-tree vlan command can be used to stop it, and the configuration can be checked to make sure it has stopped.
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The maximum number of port VLANs on which PVST+ can run is 250. It will not run automatically on any subsequently created port VLANs.
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