Allied Telesis AT-9000 Series - Region Guidelines

Chapter 47: Multiple Spanning Tree Protocol (MSTP)
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Region
Guidelines
Following are several points to remember about regions.
 A network can contain any number of regions, and a region can
contain any number of AT-9000 Switches.
 The AT-9000 Switch can belong to only one region at a time.
 A region can contain any number of VLANs.
 All of the bridges in a region must have the same configuration
name, revision level, VLANs, and VLAN to MSTI associations.
 An MSTI cannot span multiple regions.
 Each MSTI must have a regional root for locating loops in the
instance. MSTIs can share the same regional root or have different
roots. A regional root is determined by the MSTI priority value and
a bridge’s MAC address.
 The regional root of an MSTI must be in the same region as the
MSTI.