HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 112
Multiple Instance Spanning-Tree Operation, VLANs, Instance 1
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Multiple Instance Spanning-Tree Operation Overview Multiple-Instance spanning tree operation (802.1s) ensures that only one active path exists between any two nodes in a spanning-tree instance. A spanning-tree instance comprises a unique set of VLANs, and belongs to a specific spanning-tree region. A region can comprise multiple spanning-tree instances (each with a different set of VLANs), and allows one active path among regions in a network. Applying VLAN tagging to the ports in a multipleinstance 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 10, 11, 12 20, 21, 22 Instance 1 Yes No Instance 2 No Yes 4-4