Allied Telesis AT-S63 User Manual

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AT-S63 Management Software Features Guide
Section V: Spanning Tree Protocols
233
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.