CIST Root
Figure 7-6 MSTP network
CIST Root
A0
B0
C0
D0
Region Root
Region Root
Region Root
CST
IST
On the network shown in Figure 7-6, the CIST root is the root bridge of the CIST. The CIST
root is a device in A0.
CST
A Common Spanning Tree (CST) connects all the MST regions on a switching network.
If each MST region is considered a node, the CST is calculated by using STP or RSTP based on
all the nodes.
As shown in Figure 7-6, the MST regions are connected to form a CST.
IST
An IST resides within an MST region.
An IST is a special MSTI with the MSTI ID being 0, called MSTI 0.
An IST is a segment of the CIST in an MST region.
As shown in Figure 7-6, the switching devices in an MST region are connected to form an IST.
Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Ethernet Switching
7 MSTP Configuration
Issue 01 (2014-11-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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