CHAPTER 3
Spanning Tree
Spanning Tree Protocol (STP) works by selecting a root bridge and then selecting one loop-free path from the root bridge
to every other switch. (STP uses the term bridge because it was written before there were switches.) Consider the follow-
ing switched network (see Figure 3-1).
Spanning Tree must select
n One root bridge
n One root port per nonroot bridge
n One designated port per network segment
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CCNP SWITCH 642-813 Quick Reference by Denise Donohue
FIGURE 3-1
Example Switched
To p o l o g y
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