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Basic concepts in MSTP
Assume that all the four devices in Figure 159 are running MSTP. This section explains some basic
concepts of MSTP based on the figure.
Figure 159 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. These devices have the following characteristics:
• All are MSTP-enabled.
• They have the same region name.
• They have the same VLAN-to-MSTI mapping configuration.
• They have the same MSTP revision level configuration.
• They are physically linked with one another.
For example, all the devices in region A0 in Figure 159
have the same MST region configuration:
• 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, or MSTI 0).
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