Per-VLAN Spanning Tree Plus (PVST+) | 711
• PVST+ in Multi-vendor Networks on page 716
• PVST+ Extended System ID on page 716
• PVST+ Sample Configurations on page 717
Enable PVST+
When you enable PVST+, FTOS instantiates STP on each active VLAN. To enable PVST+ globally:
Disable PVST+
Display your PVST+ configuration by entering the command show config from PROTOCOL PVST
context, as shown in fig.
Figure 34-2. Display the PVST+ Configuration
Influence PVST+ Root Selection
In Figure 34-1, all VLANs use the same forwarding topology because R2 is elected the root, and all
GigabitEthernet ports have the same cost. Figure 34-3 changes the bridge priority of each bridge so that a
different forwarding topology is generated for each VLAN. This behavior demonstrates how you can use
PVST+ to achieve load balancing.
Step Task Command Syntax Command Mode
1 Enter PVST context. protocol spanning-tree pvst PROTOCOL PVST
2 Enable PVST+. no disable PROTOCOL PVST
Task Command Syntax Command Mode
Disable PVST+ globally. disable PROTOCOL PVST
Disable PVST+ on an interface, or remove a PVST+
parameter configuration.
no spanning-tree pvst INTERFACE
FTOS_E600(conf-pvst)#show config verbose
!
protocol spanning-tree pvst
no disable
vlan 100 bridge-priority 4096
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