CHAPTER 12. Spanning-Tree Protocol
Introduction
This chapter will cover the Spanning-Tree Protocol (STP), how the protocol works, and consider its strengths and weaknesses. We'll see how the protocol has evolved in the past three decades to answer those weaknesses. The frames and timers that affect the operation of the STP will be described with an emphasis on the material Cisco requires that Cisco Certified Network Associate (CCNA) candidates understand. Finally, we'll discover what can go wrong in a network at Layer 2 (where STP operates) and see how to troubleshoot STP.
STP is an important topic for network engineers to understand because of the ubiquity of Ethernet itself. To put the subject of the chapter in a greater context, it is worthwhile ...

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