Allied Telesis AT-S60 - Manual (Page 264)

Chapter 16: Multiple Spanning Tree
Section II: Advanced Features 264
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. In
addition, standardize the capitalization of the configuration name.
Examples are Sales Region and Engineering Region.
The revision number is an arbitrary number you assign 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 have
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
considers the bridges as residing in different regions.