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One VLAN can be mapped to a Multiple Spanning Tree Instance (MSTI). For example, the
maximum Instance of the Managed Switch supports is usually 16, range from 0-15. The
MSTP builds a separate Multiple Spanning Tree (MST) for each instance to maintain
connectivity among each of the assigned VLAN groups. An Internal Spanning Tree (IST) is
used to connect all the MSTP switches within an MST region. An MST Region may contain
multiple MSTP Instances.
The figure shows there are 2 VLANs/MSTP Instances and each instance has its Root and
forwarding paths.
A Common Spanning Tree (CST) interconnects all adjuacent MST regions and acts as a
virtual bridge node for communications with STP or RSTP nodes in the global network.
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.
The figure shows the CST large network. In this network, a Region may has different
instances and its own forwarding path and table, however, it acts as a single Brige of CST.
Summary of Contents for JetNet 6910G-M12 Series
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