STP Load Balancing

Notice that the STP groups each have different STP priorities. In configurations that use the STP groups on multiple devices, you can use the STP priorities to load balance the STP traffic. By setting the STP priorities for the same STP group to different values on each device, you can cause each of the devices to be the root bridge for a different STP group. This type of configuration distributes the traffic evenly across the devices and also ensures that ports that are blocked in one STP group spanning tree are used by another STP group spanning tree for forwarding. Refer to Configuration Example for STP Load Sharing for an example using STP load sharing.