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Chapter 21: Multiple Spanning Tree Protocol
232 Section V: Spanning Tree Protocols
MSTI Guidelines
Following are several guidelines to keep in mind about MSTIs:
The AT-9400 Switch can support up to 16 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.
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.
A router or Layer 3 network device is required to forward traffic
between different VLANs.