Influencing Pvst+ Root Selection - Dell S4048–ON Configuration Manual

S-series 10gbe switches

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Disable PVST+ globally.

PROTOCOL PVST mode

Disable PVST+ on an interface, or remove a PVST+ parameter configuration.

INTERFACE mode

no spanning-tree pvst

Example of Viewing PVST+ Configuration

To display your PVST+ configuration, use the show config command from PROTOCOL PVST mode.

Dell_E600(conf-pvst)#show config verbose

protocol spanning-tree pvst

vlan 100 bridge-priority 4096

Influencing PVST+ Root Selection

As shown in the previous per-VLAN spanning tree illustration, all VLANs use the same forwarding topology because R2 is elected the

root, and all TenGigabitEthernet ports have the same cost.

The following per-VLAN spanning tree illustration 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.

Figure 111. Load Balancing with PVST+

Per-VLAN Spanning Tree Plus (PVST+)