HP 9304m Installation And Getting Started Manual page 189

Installation and Getting Started Guide
Figure 6.5 Customer using Single STP and SP using multiple spanning trees
tagged to multiple vlan
stp-boundary
untagged to vlan 100
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.
Customer and SP Use Single STP
Figure 6.6 shows an example of SuperSpan where the customer network and SP both use Single STP.
Figure 6.6 Customer and SP using Single STP
tagged to multiple vlan
stp-boundary
untagged to vlan 100
In this setup, both the customer and SP networks are running a single spanning tree at Layer 2. The traffic from
VLAN 10 and 20 will be carried, or aggregated by VLAN 100 at the SP network as in the previous scenario. Loop-
free, non-blocking topology is still separately maintained by the customer's single spanning tree and the SP's
single spanning tree.
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