General Guidelines - Allied Telesis AT-GS950/24 User Manual

General Guidelines

Here are the guidelines for MSTIs:
The AT-GS950/24 switch can support up to 31 spanning tree instances,

including the CIST.
A MSTI can contain any number of VLANs.

A VLAN can belong to only one MSTI at a time.
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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
MSTI's. This is possible because a port can be in different MSTP states for
different MSTI's 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,"
next.
AT-GS950/24 Web Interface User Guide
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