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Multi-Service IronWare Switching Configuration Guide 341

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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.

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