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 MSTIIn 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 7 911 1315 1719 21 23R
2 4 6 8 10 12 14 16 18 20 2224R
2324
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 7 911 1315 1719 21 23R
2 4 6 8 10 12 14 16 18 20 2224R
2324
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