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42C4911, January 2007 105
CHAPTER 5
Spanning Tree Group
When multiple paths exist on a network, Spanning Tree Group (STG) configures the network
so that a switch uses only the most efficient path. The following topics are discussed in this
chapter:
“Overview” on page 106
“Bridge Protocol Data Units (BPDUs)” on page 107
“Multiple Spanning Trees” on page 110
“Port Fast Forwarding” on page 115
“Fast Uplink Convergence” on page 116