AT-S63 Management Software Features Guide
Section V: Spanning Tree Protocols 257
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
A configuration name is a name assigned to a region to 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.
The revision number is an arbitrary number assigned to a region. This
number can be used to keep track of the revision level of a region’s
configuration. For example, you might use this value to maintain the
number of times you revise a particular MSTP region. It is not important
that you maintain this number, only that each bridge in a region has the
same number.
The bridges of a particular region must also have the same VLANs. The
names of the VLANs and the VIDs must be same on all bridges of a
region.
Finally, the VLANs in the bridges must be associated to the same MSTIs.
If any of the above information is different on two bridges, MSTP does
consider the bridges as residing in different regions.
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