HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 113
Example of a Multiple Spanning-Tree Application
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Multiple Instance Spanning-Tree Operation Overview The logical and physical topologies resulting from these VLAN/Instance groupings result in blocking on different links for different VLANs: Region "A": Logical Topology Switch "A" Root for Instance 1 VLANs: 10, 11, 12 Path blocked for VLANs in instance 2. Switch "A" Instance 2 VLANs: 20, 21, 22 Switch "B" Instance 1 VLANs: 10, 11, 12 Switch "C" Instance 1 VLANs: 10, 11, 12 Switch "B" Root for Instance 2 VLANs: 20, 21, 22 Switch "C" Instance 2 VLANs: 20, 21, 22 Path blocked for VLANs in instance 1. Region "A": Physical Topology Path blocked for VLANs in instance 2. Switch "A" Root for Instance 1 Switch "B" Root for Instance 2 Switch "C" Path blocked for VLANs in instance 1. Figure 4-1. Example of a Multiple Spanning-Tree Application 4-5