Enable Pvst; Disable Pvst; Influence Pvst+ Root Selection - Dell Force10 MXL Blade Configuration Manual

Enable PVST+

When you enable PVST+, FTOS instantiates STP on each active VLAN. To enable PVST+ globally,
follow these steps:
Step Task
1 Enter PVST context.
2 Enable PVST+.

Disable PVST+

To disable PVST+, use the following commands.
Task
Disable PVST+ globally.
Disable PVST+ on an interface, or remove a PVST+
parameter configuration.
Display your PVST+ configuration by entering the
(Figure 23-2).
Figure 23-2. Display the PVST+ Configuration
FTOS(conf-pvst)#show config verbose
!
protocol spanning-tree pvst
no disable
vlan 100 bridge-priority 4096

Influence PVST+ Root Selection

In Figure 23-1, all VLANs use the same forwarding topology because R2 is elected the root and all
TenGigabitEthernet ports have the same cost.
a different forwarding topology is generated for each VLAN. This behavior demonstrates how you can use
PVST+ to achieve load balancing.
Command Syntax
protocol spanning-tree pvst
no disable
Command Syntax
disable
no spanning-tree pvst
command from PROTOCOL PVST context
show config
Figure 23-3 changes the bridge priority of each bridge so that
Per-VLAN Spanning Tree Plus (PVST+) | 405
Command Mode
PROTOCOL PVST
PROTOCOL PVST
Command Mode
PROTOCOL PVST
INTERFACE