Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 371)

Multi-Service IronWare Switching Configuration Guide 341
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SuperSpan™
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Customer uses single STP but SP uses multiple spanning trees
Figure 61 shows an example of SuperSpan where the customer network uses Single STP while the
SP uses multiple spanning trees.
FIGURE 61 Customer using Single STP and SP using multiple spanning trees
In this setup, the customer network is running a single spanning tree for VLANs 10 and 20. The
traffic from VLAN 10 and 20 will be carried, or aggregated by VLAN 100 at the SP’s network. The
main difference between this scenario and the previous tow scenarios is that all traffic at the
customer’s network now follows the same path, having the same STP root bridge in all VLANs.
Therefore, the customer network will not have the ability to maximize network utilization on all its
links. On the other hand, loop-free, non-blocking topology is still separately maintained by the
customer network’s single spanning tree and the SP’s per-VLAN spanning tree on VLAN 100.