Dell EMC SmartFabric OS10 User Guide Release 10.5.0

Rapid per-VLAN spanning-tree

Rapid per-VLAN spanning-tree (Rapid-PVST) is used to create a single topology per VLAN. Rapid-PVST is enabled by default; it provides faster convergence than STP 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.

Each VLAN is assigned an incremental default bridge priority. For example, if VLAN 1 is assigned a bridge priority value of 32769, then VLAN 2 (if created) is assigned a bridge priority value of 32770; similarly, VLAN 10 (if created) is assigned a bridge priority value of 32778, and so on. All three instances have the same forwarding topology.