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General guidelines – Allied Telesis AT-GS950/24 User Manual

Page 373

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AT-GS950/24 Web Interface User Guide

373

General Guidelines

Here are the guidelines for MSTIs:

The AT-GS950/24 switch can support up to 31 spanning tree instances,
including the CIST.

An MSTI can contain any number of VLANs.

A VLAN can belong to only one MSTI at a time.

A switch port can belong to more than one spanning tree instance at a
time by being an untagged and tagged member of VLANs belonging to
different MSTIs. This is possible because a port can be in different MSTP
states for different MSTIs simultaneously. For example, a port can be in
the MSTP blocking state for one MSTI and the forwarding state for another
spanning tree instance. For further information, refer to “Ports in Multiple
MSTIs” on page 375.