In the previous parts of our guide, we discussed how traffic is switched (or forwarded) through an SPB network. Today, we’re taking a quick look at the capability of load-sharing traffic over multiple paths between BEB nodes.
Figure 1: MAC-in-MAC encapsulation revisited
What are backbone VLANs?
Figure 2: A small SPB network with two backbone VLANs (shown as green and violet).
Figure 3: Two equal-cost paths between edge nodes 1 and 2.
Figure 4: Equal-cost path for the traffic forwarded over the backbone VLAN 1.
Figure 5: Equal-cost path for the traffic forwarded over the backbone VLAN 2.