5-3
Multiple Instance Spanning-Tree Operation
Overview
instance spanning-tree network enables blocking of redundant links in one
instance while allowing forwarding over the same links for non-redundant use
by another instance. For example, suppose you have three switches in a region
configured with VLANs grouped into two instances, as follows:
VLANs Instance 1 Instance 2
10, 11, 12 Yes No
20, 21, 22 No Yes