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Appendix A: MSTP Overview
354
Figure 141. Multiple VLANs in a MSTI
In this example, because an MSTI contains more than one VLAN, the links
between the VLAN parts is made with tagged (not untagged) ports so that they
can carry traffic from more than one virtual LAN. Referring again to Figure
141, 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.