Operation Manual – MSTP
H3C S5500-EI Series Ethernet Switches
Chapter 1 MSTP Configuration
1-13
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:
z
All are MSTP-enabled,
z
They have the same region name,
z
They have the same VLAN-to-instance mapping configuration,
z
They have the same MSTP revision level configuration, and
z
They are physically linked with one another.
For example, all the devices in region A0 in
Figure 1-4
have the same MST region
configuration:
z
The same region name,
z
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
z
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.
