Allied-telesis AT-S62 Manual do Utilizador descarregar pdf (Página 358)

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Chapter 19: Multiple Spanning Tree Protocol

Section IV: Spanning Tree Protocols 358

MSTI Guidelines

Here are several guidelines to keep in mind about MSTIs:

❑ An AT-8524M can support up to 16 spanning tree instances,

including the CIST, at a time.

❑ 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. This allows you to assign a port as a tagged and

untagged member of VLANs that belong to different MSTIs. What

makes this possible is a port’s ability to be in different MSTP states

for different MSTIs. For example, a port can be in the MSTP

blocking state for one MSTI and the forwarding state for another

spanning tree instance, simultaneously.

❑ A router or Layer 3 network device is required to forward traffic

between different VLANs.

VLAN and MSTI

Associations

Part of the task to configuring MSTP involves assigning VLANs to

spanning tree instances. The mapping of VLANs to MSTIs is called

associations. A VLAN, either port-based or tagged, can belong to only

one instance at a time, but an instance can contain any number of

VLANs.

Multiple

Spanning Tree

Regions

Another important concept of MSTP is regions. A MSTP region is defined

as a group of bridges that share exactly the same MSTI characteristics.

Those characteristics are:

❑ Configuration name

❑ Revision level

❑ VLANs

❑ VLAN to MSTI ID associations

A configuration name is a name you assign to a region to help you

identify it. You must assign each bridge in a region exactly the same

name; even the same upper and lowercase lettering. Identifying the

regions in your network is easier if you choose names that are

characteristic of the functions of the nodes and bridges of the region.

Examples are Sales Region and Engineering Region.

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