Connectivity Guide

Rapid per-VLAN spanning-tree plus
RPVST+ is an RSTP to create a single topology per VLAN. RPVST+ is enabled by default, provides faster convergence, and runs
on the default VLAN (VLAN 1).
Configuring Rapid-PVST+ is a four-step process:
1. Ensure the interfaces are in L2 mode.
2. Place the interfaces in VLANs. By default, switchport interfaces are members of the default (VLAN1).
3. Enable Rapid-PVST+. This step is only required if another variation of STP is present.
4. (Optional) Select a non-default bridge-priority for the VLAN for load balancing.
By default, each VLAN instance is assigned default bridge priority 32768. For example, all three instances have the same
forwarding topology. Traffic load balancing is not achievable with this kind of priority assignment. To achieve load balancing, you
must assign each instance a different priority, as shown in Load Balancing with RPVST+.
Load balance and root selection
All VLANs use the same forwarding topology — R2 is elected as the root and all 10G Ethernet ports have the same cost.
RPVST+ changes the bridge priority of each bridge so that a different forwarding topology generates for each VLAN.
To achieve RPVST+ load balancing, assign a different priority on each bridge.
326
Layer 2