R3166-R3206-HP High-End Firewalls Network Management Configuration Guide-6PW101

Figure 28 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, and

• They are physically linked with one another.

For example, all the switches in region A0 in Figure 28 ha

ve the same MST region configuration as

follows:

• 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), and

• 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.