Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 370)

340 Multi-Service IronWare Switching Configuration Guide
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SuperSpan™
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Customer uses multiple spanning trees but SP uses single STP
Figure 60 shows an example of SuperSpan where the customer network uses multiple spanning
trees while the SP network uses Single STP.
FIGURE 60 Customer using multiple spanning trees and SP using Single STP
Customer traffic from different VLANs is maintained by different spanning trees, while the SP
network is maintained by a single spanning tree. The SP can still use multiple VLANs at the core to
separate traffic from different customers. However, all VLANs will have the same network topology
because they are all calculated by the single spanning tree. The loop-free, non-blocking network
acts like a hub for the customer network, with boundary ports 2/1 on each device being untagged
members of VLAN 100.
Traffic from all VLANs in the customer network will be aggregated through VLAN 100 at the SP. This
setup leaves the customer network’s switching pattern virtually unchanged from the scenario in
“Customer and SP use multiple spanning trees” , since the SP network still is perceived as a virtual
hub, and maintenance of the hub's loop-free topology is transparent to the customer network.