Allied Telesis AT-S62 - Manual (Page 357)

AT-S62 User’s Guide
Section IV: Spanning Tree Protocols 357
A MSTI can contain more than one VLAN. This is illustrated in Figure 111
where there are two AT-8524M 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 111 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 111, 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.
LINK
MODE
LINK
MODE
FAULT
RPS
MASTER
PWR
MODE STATUS
AT-8524M Fast Ethernet Switch
LINK
MODE
LINK
MODE
FAULT
RPS
MASTER
PWR
MODE STATUS
AT-8524M Fast Ethernet Switch
MSTI 1 MSTI 2
Sales
VLAN Design
VLAN
Engineering
VLAN
Presales
VLAN
Tagged
Ports
Tagged
Ports