Allied Telesis AT-S111, AT-GS950/48PS manual Spanning Regions without Blocking

Appendix A: MSTP Overview

Region 1 VLANs	Region 2 VLANs
Accounting	Accounting
Sales	Sales
Pre-Sales	Pre-Sales
Marketing	Technical Support
Product Management	Software Engineering
Project Management	Hardware Engineering

The two regions share three VLANs: Accounting, Sales, and Presales. You can group these three VLANs into the same MSTI in each region. For instance, for Region 1 you might group the three VLANs in MSTI 12 and in Region 2 you could group them into MSTI 6. After they are grouped, you can connect the VLANs across the regions using a link of untagged/tagged ports a shown in Figure 145.

Figure 145. Spanning Regions without Blocking

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