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Dell SmartFabric OS10 User Guide Release 10.5.4

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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.

RPVST per VLAN Spanning-Tree Plus

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.

NOTE: Z9332F-ON supports a total of 64 instances, of which 3 VLANs are used for internal purposes. When you run Rapid-PVST flavor, each VLAN allocates one instance until the VLAN count reaches 61 and map the default instance after that.
NOTE: The number of RPVST+ Port VLAN (PV) count supported in SmartFabric OS10 is 400. For example, if you configure 200 RPVST+ VLANs, you can add them to a maximum of two ports and not beyond that count. Similarly, if you have configured 50 RPVST+ VLANs, you can add them to 8 ports.

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