H3C S3610-28P Operation Manual page 219

Operation Manual – MSTP
H3C S3610&S5510 Series Ethernet Switches
Figure 1-4 Basic concepts in MSTP
1) MST region
A multiple spanning tree region (MST region) is composed of multiple devices in a
switched network and 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-instance mapping configuration,
They have the same MSTP revision level configuration, and
They are physically linked with one another.
For example, all the devices in region A0 in
configuration:
The same region name,
The same VLAN-to-instance mapping (VLAN 1 is mapped to MST instance 1,
VLAN 2 to MST instance 2, and the rest to the command and internal spanning
tree (CIST). CIST refers to MST instance 0), and
The same MSTP revision level (not shown in the figure).
Multiple MST regions can exist in a switched network. You can use an MSTP command
to group multiple devices to the same MST region.
Figure 1-4
1-13
Chapter 1 MSTP Configuration
have the same MST region