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AT-S63 Management Software Features Guide
Section V: Spanning Tree Protocols 231
A MSTI can contain more than one VLAN. This is illustrated in Figure 27
where there are two AT-9400 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 27. 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 27, 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.
FAULT
RPS
MASTER
POWER
CLASS 1
LASER PRODUCT
STATUS
TERMINAL
PORT
1357911
2 4 6 8 10 12
13 15 17 19 21 23R
14 16 18 20 22 24R
AT-9424T/SP
Gigabit Ethernet Switch
1 3 5 7 9 11 13 15 17 19 2123R
2 4 6 8 1012 1416 1820 2224R
23 24
L/A
D/C
D/C
L/A
D/C
L/A
1000 LINK / ACT
HDX /
COL
FDX
10/100 LINK / ACT
PORT ACTIVITY
L/A
1000 LINK / ACT
SFP
SFP
24
SFP
23
FAULT
RPS
MASTER
POWER
GBIC
23
GBIC
24
CLASS 1
LASER PRODUCT
STATUS
TERMINAL
PORT
1357911
2 4 6 8 10 12
13 15 17 19 21 23R
14 16 18 20 22 24R
AT-9424T/GB
Gigabit Ethernet Switch
1 3 5 7 9 11 13 15 17 19 2123R
2 4 6 8 1012 1416 1820 2224R
23 24
L/A
D/C
D/C
L/A
D/C
L/A
1000 LINK / ACT
HDX /
COL
FDX
10/100 LINK / ACT
PORT ACTIVITY
L/A
1000 LINK / ACT
GBIC
MSTI 1 MSTI 2
Tagged
Ports
Tagged
Ports
Presales
VLAN
Sales
VLAN
Design
VLAN
Engineering
VLAN