ZyXEL ES-2108PWR User Guide - Page 105
MST Instance, 1.4.4, Common and Internal Spanning Tree CIST
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Chapter 11 Spanning Tree Protocol • VLAN-to-MST Instance mapping 11.1.4.3 MST Instance An MST Instance (MSTI) is a spanning tree instance. VLANs can be configured to run on a specific MSTI. Each created MSTI is identified by a unique number (known as an MST ID) known internally to a region. Thus an MSTI does not span across MST regions. The following figure shows an example where there are two MST regions. Regions 1 and 2 have 2 spanning tree instances. Figure 51 MSTIs in Different Regions 11.1.4.4 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 52 MSTP and Legacy RSTP Network Example ES-2108 Series User's Guide 105