Allied Telesis AT-GS950/24 - Manual (Page 333)

AT-GS950/24 Web Interface User Guide
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Figure 119 on page 333 illustrates the same two AT-GS950/24 switches and
the same two virtual LANs. But in this example, the two switches are running
MSTP and the two VLANs have been assigned different spanning tree
instances. Now that they reside in different MSTIs, both links remain active,
enabling the VLANs to forward traffic over their respective direct link.
Figure 119. MSTP Example of Two Spanning Tree Instances
Multiple VLANS
Assigned to an
MSTI
A MSTI can contain more than one VLAN. This is illustrated in Figure 120 on
page 334 where there are two AT-GS950/24 switches with four VLANs. There
are two MSTIs, each containing two VLANs. MSTI 1 contains the Sales and
Presales VLANs and MSTI 2 contains the Design and Engineering VLANs.