Configuring MSTP
23.2.1 Basic Concepts in MSTP
Figure 23-1 MSTP topology example
As shown in the MSTP network, MSTP is composed of three spanning tree areas and a
running 802.1D STP protocol switch.
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.
Multiple MST regions can exist in a switched network. You can use an MSTP command to
group multiple devices to the same MST region.
2. CIST
Jointly constituted by ISTs and the CST, the CIST is a single spanning tree that connects
all devices in a switched network.
In Figure 23-1, for example, the ISTs in all MST regions plus the inter-region CST
constitute the CIST of the entire network.
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