HP A5120 EI Series Configuration Guide

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Basic concepts in MSTP
Figure 18 Basic concepts in MSTP
MST region 1
MST region 2 MST region 3
MST region 4
VLAN 1 à MSTI 1
VLAN 2 à MSTI 2
Other VLANs à MSTI 0
VLAN 1 à MSTI 1
VLAN 2 à MSTI 2
Other VLANs à MSTI 0
VLAN 1 à MSTI 1
VLAN 2 à MSTI 2
Other VLANs à MSTI 0
VLAN 1 à MSTI 1
VLAN 2&3 à MSTI 2
Other VLANs à MSTI 0
CST
Figure 19 Network diagram and topology of MST region 3
MST region 3
Device A
Device C
Device B
Device D
VLAN 1 à MSTI 1
VLAN 2&3 à MSTI 2
Other VLANs à MSTI 0
To MST region 4
To MST region 2
BA
C D
MSTI 1
A B
C D
MSTI 0
B
D
MSTI 2
C
A
Regional root
MSTI
Topology of MSTIs in MST region 3
As shown in Figure 18, a switched network comprises four MST regions, and each MST region comprises
four devices running MSTP. Figure 19 shows the networking topology of MST region 3.

HP A5120 EI Series Specifications

General

Uplink Ports	4 x SFP
Stacking	No
Management	CLI, Web, SNMP
Routing Protocols	RIP, OSPF
Power Supply	AC
MAC Address Table Size	16K
Dimensions	440 x 430 x 44 mm
Operating Temperature	0°C to 45°C
Operating Humidity	10% to 90% non-condensing
Model	HP A5120-24G EI Switch (JG234A)
VLANs	4094