122
An MST Region consists of a group of interconnected bridges that have the same MST
Configuration Identifiers (including the Region Name, Revision Level and Configuration
Digest
– see "Configuring Multiple Spanning Trees" on page 123). An MST Region may
contain multiple MSTP Instances. An Internal Spanning Tree (IST) is used to connect all the
MSTP switches within an MST region. A Common Spanning Tree (CST) interconnects all
adjacent MST Regions, and acts as a virtual bridge node for communications with STP or
RSTP nodes in the global network.
Figure 47: Common Internal Spanning Tree, Common Spanning Tree, Internal
Spanning Tree
MSTP connects all bridges and LAN segments with a single Common and Internal Spanning
Tree (CIST). The CIST is formed as a result of the running spanning tree algorithm between
switches that support the STP, RSTP, MSTP protocols.
Once you specify the VLANs to include in a Multiple Spanning Tree Instance (MSTI), the
protocol will automatically build an MSTI tree to maintain connectivity among each of the
VLANs. MSTP maintains contact with the global network because each instance is treated as
an RSTP node in the Common Spanning Tree (CST).
Содержание GEP-1070
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