Allied Telesis AT-S60 - Manual (Page 262)

Chapter 16: Multiple Spanning Tree
Section II: Advanced Features 262
A MSTI can contain more than one VLAN. This is illustrated in Figure 86
where there are two AT-8400 Series 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.
Figure 86 Multiple VLANs in a MSTI
You should note in this example that since 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 86, the tagged link in MSTI 1 is carrying
traffic for both the Presales and Sales VLANs while the tagged link in
MSTI 2 is carrying traffic for the Design and Engineering VLANs.
AT-8400 SERIES
AT-8400 SERIES
MSTI 1 MSTI 2
Sales
VLAN Design
VLAN Engineering
VLAN
Presales
VLAN
Tagged
Ports
Tagged
Ports