HP V1910 Switch Series User Manual page 195

Figure 164 Basic concepts in MSTP
MST region
A multiple spanning tree region (MST region) consists of multiple devices in a switched network and the
network segments among them. All these devices have the following characteristics:
MSTP-enabled

Same region name

 Same VLAN-to-MSTI mapping configuration
Same MSTP revision level

Physically linked together

All the devices in region A0 in
The same region name

 The same VLAN-to-MSTI mapping configuration (VLAN 1 is mapped to MSTI 1, VLAN 2 to MSTI 2,
and the rest to the common and internal spanning tree (CIST, that is, MSTI 0)
 The same MSTP revision level (not shown in the figure)
Multiple MST regions can exist in a switched network. You can assign multiple devices to the same MST
region.
VLAN-to-MSTI mapping table
As an attribute of an MST region, the VLAN-to-MSTI mapping table describes the mapping relationships
between VLANs and MSTIs. In
Figure 164 have the same MST region configuration:
Figure 164, the VLAN-to-MSTI mapping table of region A0 is: VLAN 1 is
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