Common And Internal Spanning Tree (Cist) - ZyXEL Communications XMG1930-30 User Manual

Chapter 53 Spanning Tree Protocol

53.11.4 Common and Internal Spanning Tree (CIST)

A CIST represents the connectivity of the entire network and it is equivalent to a spanning tree in an STP/
RSTP. The CIST is the default MST instance (MSTID 0). Any VLANs that are not members of an MST instance
are members of the CIST. In an MSTP-enabled network, there is only one CIST that runs between MST
regions and single spanning tree devices. A network may contain multiple MST regions and other
network segments running RSTP.
Figure 260 MSTP and Legacy RSTP Network Example
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