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Figure 156. multiple vlans in an msti – Allied Telesis AT-GS950/24 User Manual

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Appendix A: MSTP Overview

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Figure 156. Multiple VLANs in an MSTI

In this example, because an MSTI contains more than one VLAN, the links
between the VLAN parts are made with tagged (not untagged) ports so that
they can carry traffic from more than one virtual LAN. Referring again to
Figure 156, the tagged link in MSTI 1 is carrying traffic for both the Presales
and Sales VLANs between the two switches, while the tagged link in MSTI 2 is
carrying traffic for the Design and Engineering VLANs.