ZyXEL Communications OLT2406, User Manual

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Chapter 63 Spanning Tree Protocol
OLT2406 User’s Guide
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Figure 258 MSTIs in Different Regions
63.2.4.4 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 259 MSTP and Legacy RSTP Network Example
63.3 STP and RSTP Commands
Use these commands to configure Spanning Tree Protocol (STP) and Rapid Spanning Tree Protocol
(RSTP) as defined in the following standards.
• IEEE 802.1D Spanning Tree Protocol
• IEEE 802.1w Rapid Spanning Tree Protocol