Lenovo RackSwitch G8264 Application Manual page 195

In the second network, the problem of improper link blocking is resolved when the
VLANs are placed into different Spanning Tree Groups (STGs). Since each STG has
its own independent instance of Spanning Tree, each STG is responsible only for
the loops within its own VLAN. This eliminates the false loop, and allows both
VLANs to forward packets between the switches at the same time.
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© Copyright Lenovo 2016 Chapter 11: Spanning Tree Protocols