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Chapter 21: Multiple Spanning Tree Protocol
236 Section V: Spanning Tree Protocols
Figure 28 illustrates the concept of regions. It shows one MSTP region
consisting of two AT-9400 Switches. Each switch in the region has the
same configuration name and revision level. The switches also have the
same five VLANs and the VLANs are associated with the same MSTIs.
Figure 28. Multiple Spanning Tree Region
The AT-9400 Switch determines regional boundaries by examining the
MSTP BPDUs received on the ports. A port that receives a MSTP BPDU
from another bridge with regional information different from its own is
considered to be a boundary port and the bridge connected to the port as
belonging to another region.
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
1357911131517192123R
24681012141618202224R
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
Configuration Name: Marketing
Region
Revision Level: 1
VLAN to MSTI Associations:
MSTI ID 1
VLAN: Sales (VID 2)
VLAN: Presales (VID 3)
MSTI ID 2
VLAN: Accounting (VID 4)
Configuration Name: Marketing
Region
Revision Level: 1
VLAN to MSTI Associations:
MSTI ID 1
VLAN: Sales (VID 2)
VLAN: Presales (VID 3)
MSTI ID 2
VLAN: Accounting (VID 4)
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
1357911131517192123R
24681012141618202224R
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