Allied-telesis AT-S60 Manual de usuario descargar pdf (Pagina 263)

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AT-S60 Management Software User’s Guide

Section II: Advanced Features 263

This example illustrates Allied Telesyn’s implementation of MSTP. It

shows that a tagged port cannot be a member of VLANs that belong to

different MSTIs. That is why each MSTI in the example has its own tagged

link.

MSTI Guidelines

Here are several guidelines to keep in mind about MSTIs:

❑ An AT-8400 Series switch 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 port on the switch can belong to only one spanning tree

instance at a time. This means that a port cannot be a tagged and

untagged member of VLANs that belong to different MSTIs. For

example, if Port 1 on a line card is an untagged port in one VLAN

and a tagged port in three other VLANs, all four VLANs must be

assigned to the same MSTI. This rule is required because a port can

be either blocking or forwarding; a port cannot perform both

functions simultaneously, which could occur if it was a member of

VLANs that resided in different spanning tree instances.

❑ 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 number

❑ VLANs

❑ VLAN to MSTI ID associations

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